fix(protocol): harden gateway contract validation

Makefile

@@ -20,6 +20,7 @@ source-verify:
 	$(PYTHON) -B tools/fixture_digest.py
 
 scope-verify:
+	$(PYTHON) -B tools/test_check_scope.py
 	$(PYTHON) -B tools/check_scope.py
 
 go-test:
@@ -39,6 +40,7 @@ conformance:
 
 frame-verify:
 	$(PYTHON) tools/validate_frames.py
+	$(PYTHON) tools/validate_gateway_envelopes.py
 
 clean-generated:
 	$(PYTHON) tools/generate.py --check

fixtures/conformance/gateway-clipboard-audit-v1.tsv

@@ -0,0 +1,6 @@
+id	version	kind	input	expected
+valid-forwarded	1	gateway_clipboard_audit	direction=client_to_provider;outcome=forwarded;text_bytes=1024;reason=forwarded	valid
+valid-suppressed	1	gateway_clipboard_audit	direction=provider_to_client;outcome=suppressed;text_bytes=12;reason=loop	valid
+audit-invalid-direction	1	gateway_clipboard_audit	direction=bidirectional;outcome=forwarded;text_bytes=1;reason=forwarded	invalid:clipboard_audit
+invalid-bytes	1	gateway_clipboard_audit	direction=client_to_provider;outcome=rejected;text_bytes=65537;reason=policy	invalid:clipboard_audit
+invalid-content	1	gateway_clipboard_audit	direction=client_to_provider;outcome=rejected;text_bytes=1;reason=rate;text=forbidden	invalid:forbidden

fixtures/conformance/gateway-clipboard-v1.tsv

@@ -0,0 +1,12 @@
+id	version	kind	input	expected
+valid-client-to-provider	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=abcdefghijklmnop	valid
+valid-provider-to-client	1	gateway_clipboard	direction=provider_to_client;text=host%20text;encoding=utf-8;loop_token=qrstuvwxyzABCDEF	valid
+valid-token-alphabet	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_	valid
+valid-token-max	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_	valid
+invalid-direction	1	gateway_clipboard	direction=bidirectional;text=hello;encoding=utf-8;loop_token=abcdefghijklmnop	invalid:clipboard
+invalid-token	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=short	invalid:clipboard
+invalid-token-15	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=abcdefghijklmno	invalid:clipboard
+invalid-token-129	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_A	invalid:clipboard
+invalid-token-character	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=!!!!!!!!!!!!!!!!	invalid:clipboard
+invalid-token-trailing-bits	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=AAAAAAAAAAAAAAAAAB	invalid:clipboard
+invalid-file	1	gateway_clipboard	direction=client_to_provider;text=hello;encoding=utf-8;loop_token=abcdefghijklmnop;file=file.txt	invalid:forbidden

fixtures/conformance/gateway-input-feedback-v1.tsv

@@ -0,0 +1,22 @@
+id	version	kind	input	expected
+valid-keyboard-press	1	gateway_input	hex=5647493101040102001e	valid
+valid-keyboard-release	1	gateway_input	hex=5647493101040000001e	valid
+valid-mouse-button	1	gateway_input	hex=564749310203010100	valid
+valid-mouse-release	1	gateway_input	hex=564749310203000100	valid
+valid-relative-mouse	1	gateway_input	hex=564749310304fffe0003	valid
+valid-utf8-scalar	1	gateway_input	hex=564749310403e29883	valid
+valid-controller	1	gateway_input	hex=5647493105110200030004ffff00010002000300040005	valid
+valid-controller-release	1	gateway_input	hex=5647493105110200000000000000000000000000000000	valid
+valid-idr	1	gateway_feedback	hex=5647463100010000	valid
+valid-fec	1	gateway_feedback	hex=56474631000200150000002a000500030002000a000200080002140001	valid
+valid-termination	1	gateway_feedback	hex=564746310110000400000001	valid
+valid-rumble	1	gateway_feedback	hex=56474631011100050112345678	valid
+valid-hdr	1	gateway_feedback	hex=564746310112000101	valid
+invalid-input-magic	1	gateway_input	hex=494e503101040102001e	invalid:magic
+invalid-input-kind	1	gateway_input	hex=564749317f00	invalid:kind
+invalid-input-reserved	1	gateway_input	hex=564749310203010101	invalid:reserved
+invalid-input-utf8	1	gateway_input	hex=564749310402c328	invalid:utf8
+invalid-input-length	1	gateway_input	hex=564749310104010200	invalid:length
+invalid-feedback-direction	1	gateway_feedback	hex=5647463101020000	invalid:direction
+invalid-feedback-type	1	gateway_feedback	hex=5647463100030000	invalid:type
+invalid-feedback-length	1	gateway_feedback	hex=5647463101100003000000	invalid:length

fixtures/manifest.json

@@ -4,7 +4,10 @@
     "fixtures/conformance/control-v1.tsv",
     "fixtures/conformance/datagram-v1.tsv",
     "fixtures/conformance/events-v1.tsv",
+    "fixtures/conformance/gateway-clipboard-audit-v1.tsv",
+    "fixtures/conformance/gateway-clipboard-v1.tsv",
+    "fixtures/conformance/gateway-input-feedback-v1.tsv",
     "fixtures/conformance/tunnel-v1.tsv"
   ],
-  "corpus_sha256": "0874d39dd14c0107e602ea8909f8d53673f964c67dc9fd5fcadb8641e6ebf592"
+  "corpus_sha256": "69d5b12a533ff0d9786784b99aecc8a74a7ec2c6855b75c52e46ecff5bd3e6c5"
 }

frames/datagram-v1.md

@@ -29,4 +29,11 @@ Registered channels are `control.ack.v1`, `control.cancel.v1`, `clipboard.text.v
 application flow IDs 10, 11, and 12 and a path-MTU-safe payload limit of 1,179 bytes;
 larger encoded units use at most 16 validated fragments. Clipboard payloads are UTF-8
 JSON text contracts and remain subject to the 65,536-byte text limit and explicit
-authorization.
+Server-owned direction, rate, and loop-token policy as defined in
+`gateway-clipboard-v1.md`.
+
+Within an active Phase 3C gateway session, `input.sequenced.v1` and the
+bidirectional reliable `control.ack.v1` payloads additionally use the exact
+provider-neutral grammars in [gateway-input-feedback-v1.md](gateway-input-feedback-v1.md).
+Those grammars do not alter this datagram header or make provider traffic visible to
+the Verse client.

frames/gateway-clipboard-v1.md

@@ -0,0 +1,28 @@
+# Gateway clipboard text v1
+
+`clipboard.text.v1` is a reliable, authenticated gateway-only `ChannelFrame`
+flow. Its UTF-8 JSON payload is a `GatewayClipboardText` object:
+
+```json
+{"direction":"client_to_provider","text":"text","encoding":"utf-8","loop_token":"base64url-token"}
+```
+
+`direction` is exact: the client may send only `client_to_provider`, and the
+gateway may send only `provider_to_client`. The text contains no file name,
+URL, binary value, or client-folder field and is at most the Server-owned
+`clipboard_policy.max_text_bytes` value. `loop_token` is a 16--128 character
+canonical unpadded ASCII base64url token generated by the originating endpoint. An endpoint MUST retain
+recent token/value pairs only for the bounded policy window and MUST suppress a
+matching reflected value; a mismatched, malformed, expired, or replayed token
+is rejected without clipboard mutation.
+
+The gateway receives the policy only in authenticated session work. A disabled
+direction, a rate above `max_updates_per_minute`, invalid UTF-8, an oversized
+payload, or an unknown field fails closed. Clipboard bytes are never emitted to
+provider-state, audit, telemetry, or error payloads.
+
+For every successfully delivered, loop-suppressed, or policy/rate/provider/malformed
+rejection, the gateway sends an mTLS control-plane `GatewayClipboardAudit` record. It contains
+only the session identifier, direction, bounded text-byte count, outcome, and a
+fixed reason code; it contains neither text nor loop token. The Server persists it
+against the broker session using the authenticated gateway identity.

frames/gateway-input-feedback-v1.md

@@ -0,0 +1,78 @@
+# Gateway input and feedback v1
+
+This grammar is carried only in an authenticated Phase 3C gateway session. It
+is deliberately provider-neutral: it never carries provider routes,
+certificates, credentials, opaque provider packets, clipboard bytes, files, or
+client-folder data. It does not change the v1 datagram header or any existing
+release candidate.
+
+## `input.sequenced.v1` payload (`VGI1`)
+
+All multibyte fields are unsigned big-endian. The payload has exactly six bytes
+of header followed by the declared body:
+
+| Offset | Size | Field | Rule |
+|---:|---:|---|---|
+| 0 | 4 | magic | ASCII `VGI1` |
+| 4 | 1 | kind | one of the kinds below |
+| 5 | 1 | payload length | exact body byte count |
+| 6 | N | body | exact kind-specific body |
+
+The decoder rejects an unknown kind, non-exact length, nonzero reserved byte,
+unsupported controller index, malformed UTF-8, a non-scalar UTF-8 value, or a
+payload larger than the channel limit before provider translation. A false
+keyboard or mouse state and a zeroed controller state are explicit releases;
+they are retained by the gateway and replayed as individual provider releases
+during cleanup.
+
+| Kind | Name | Exact body |
+|---:|---|---|
+| `0x01` | keyboard | `state` (`0` release, `1` press), `modifiers` (one byte), nonzero `scancode` (u16). |
+| `0x02` | mouse button | `state` (`0` release, `1` press), `button` (`1` through `5`), reserved `0`. |
+| `0x03` | relative mouse | `delta_x` (i16), `delta_y` (i16). |
+| `0x04` | UTF-8 scalar | exactly one valid UTF-8 Unicode scalar, one through four bytes. |
+| `0x05` | controller state | `controller` (0 through 15), `active_mask` (u16), `button_flags` (u16), `left_trigger` (u8), `right_trigger` (u8), `left_x` (i16), `left_y` (i16), `right_x` (i16), `right_y` (i16), `extra_button_flags` (u16). A zero `active_mask` and zero state is release. |
+
+Keyboard, mouse button, UTF-8, and controller messages are delivered over the
+gateway's reliable ordered input flow. Relative mouse is a state change, not a
+pressed-state entry. The gateway maps the validated values to the provider's
+separate keyboard, mouse, UTF-8, and controller control messages; it does not
+forward this envelope to the provider.
+
+## Reliable control payload (`VGF1`)
+
+`control.ack.v1` remains the existing authenticated bidirectional reliable
+control flow. Within an active gateway session, its provider-feedback payload
+is the following exact envelope:
+
+| Offset | Size | Field | Rule |
+|---:|---:|---|---|
+| 0 | 4 | magic | ASCII `VGF1` |
+| 4 | 1 | direction | `0` client-to-gateway; `1` gateway-to-client |
+| 5 | 1 | type | valid only for the stated direction |
+| 6 | 2 | payload length | exact payload byte count |
+| 8 | N | payload | exact type-specific body |
+
+The client-to-gateway types are `0x01` IDR request (empty) and `0x02` FEC
+status: `frame_index` (u32), `highest_received_sequence` (u16),
+`next_contiguous_sequence` (u16), `missing_before_highest` (u16),
+`total_data_packets` (u16), `total_parity_packets` (u16),
+`received_data_packets` (u16), `received_parity_packets` (u16),
+`fec_percentage` (u8), `multi_fec_block_index` (u8), and
+`multi_fec_block_count` (u8). The gateway maps this fixed 21-byte structure to
+the provider's unsequenced ENet FEC delivery; it does not put it on the reliable
+provider input path.
+
+The gateway-to-client types are `0x10` host termination (`exit_code` u32),
+`0x11` rumble (`controller` u8, `low_frequency` u16,
+`high_frequency` u16), and `0x12` HDR mode (`enabled` exactly `0` or `1`). The
+gateway derives these from authenticated provider control messages, normalizes
+their bounded fields, and rejects all unrecognized provider feedback. The HDR
+envelope intentionally carries only the negotiated mode; provider-specific HDR
+metadata remains behind the gateway boundary.
+
+Apollo's pinned `src/stream.cpp` source defines separate termination, rumble,
+and HDR control structures, while Moonlight common-C's `ControlStream.c` and
+`InputStream.c` separate reliable input/control from UDP media. This Verse
+grammar is a new normalized contract; it does not copy either implementation or
+expose its wire format.

frames/registry.json

@@ -4,12 +4,12 @@
   "header_bytes": 21,
   "maximum_frame_bytes": 65536,
   "channels": [
-    {"id": 1, "name": "control.ack.v1", "direction": "bidirectional", "max_payload_bytes": 1024},
+    {"id": 1, "name": "control.ack.v1", "direction": "bidirectional", "max_payload_bytes": 1024, "payload_profile": "gateway-feedback-v1"},
     {"id": 2, "name": "control.cancel.v1", "direction": "client-to-server", "max_payload_bytes": 2048},
     {"id": 3, "name": "clipboard.text.v1", "direction": "bidirectional", "max_payload_bytes": 65515},
     {"id": 10, "name": "media.video.v1", "direction": "server-to-client", "max_payload_bytes": 1179},
     {"id": 11, "name": "media.audio.v1", "direction": "server-to-client", "max_payload_bytes": 1179},
-    {"id": 12, "name": "input.sequenced.v1", "direction": "client-to-server", "max_payload_bytes": 1179}
+    {"id": 12, "name": "input.sequenced.v1", "direction": "client-to-server", "max_payload_bytes": 1179, "payload_profile": "gateway-input-v1"}
   ],
   "reserved_rejected": ["provider", "vm", "file-transfer", "clipboard.binary"]
 }

gen/go/protocol/protocol.go

@@ -3,6 +3,7 @@ package protocol
 
 import (
 	"bytes"
+	"encoding/base64"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -12,7 +13,7 @@ import (
 	"time"
 )
 
-const SchemaSHA256 = "792abfb9cfe70e79911d499d76c009ab848713278bc240b88576df520580e480"
+const SchemaSHA256 = "e98c75ef81bbeac6be2b8f11202c1ffecec0aa515b48576a26756290e99d5dd8"
 const ProtocolVersion = "1.0.0"
 const CurrentWireVersion = "1"
 const NMinus1WireVersion = "0"
@@ -86,6 +87,13 @@ type ChannelFrame struct {
 	Payload       string `json:"payload"`
 }
 
+type ClipboardPolicy struct {
+	ClientToProviderEnabled bool  `json:"client_to_provider_enabled"`
+	ProviderToClientEnabled bool  `json:"provider_to_client_enabled"`
+	MaxTextBytes            int64 `json:"max_text_bytes"`
+	MaxUpdatesPerMinute     int64 `json:"max_updates_per_minute"`
+}
+
 type ClipboardText struct {
 	Text     string `json:"text"`
 	Encoding string `json:"encoding"`
@@ -158,6 +166,22 @@ type EventResume struct {
 	LastSequence int64  `json:"last_sequence"`
 }
 
+type GatewayClipboardAudit struct {
+	Version   string `json:"version"`
+	SessionID string `json:"session_id"`
+	Direction string `json:"direction"`
+	Outcome   string `json:"outcome"`
+	TextBytes int64  `json:"text_bytes"`
+	Reason    string `json:"reason"`
+}
+
+type GatewayClipboardText struct {
+	Direction string `json:"direction"`
+	Text      string `json:"text"`
+	Encoding  string `json:"encoding"`
+	LoopToken string `json:"loop_token"`
+}
+
 type GatewayDrain struct {
 	Version   string `json:"version"`
 	GatewayID string `json:"gateway_id"`
@@ -258,6 +282,8 @@ type ProviderSessionWork struct {
 	ClientCertificatePem                  string          `json:"client_certificate_pem"`
 	ClientPrivateKeyPem                   string          `json:"client_private_key_pem"`
 	ServerCertificatePem                  string          `json:"server_certificate_pem"`
+	ClipboardPolicy                       ClipboardPolicy `json:"clipboard_policy"`
+	ProviderApplicationTerminationAllowed bool            `json:"provider_application_termination_allowed"`
 }
 
 type ProviderState struct {
@@ -943,6 +969,9 @@ func (v ChannelFrame) Validate() error {
 	if len(v.Payload) > 87384 {
 		violations = append(violations, FieldViolation{Field: "payload", Code: "max_length"})
 	}
+	if len(v.Payload) > 65536 {
+		violations = append(violations, FieldViolation{Field: "payload", Code: "max_bytes"})
+	}
 	if v.FragmentIndex >= v.FragmentCount {
 		violations = append(violations, FieldViolation{Field: "fragment_index", Code: "invalid_order"})
 	}
@@ -985,9 +1014,6 @@ func DecodeChannelFrame(data []byte) (ChannelFrame, error) {
 	if raw, ok := fields["version"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
 		return value, ValidationError{Violations: []FieldViolation{{Field: "version", Code: "required"}}}
 	}
-	if raw, ok := fields["payload"]; ok && len(raw) > 65536 {
-		return value, ValidationError{Violations: []FieldViolation{{Field: "payload", Code: "max_bytes"}}}
-	}
 	decoder := json.NewDecoder(bytes.NewReader(data))
 	decoder.DisallowUnknownFields()
 	if err := decoder.Decode(&value); err != nil {
@@ -1013,6 +1039,78 @@ func EncodeChannelFrame(value ChannelFrame) ([]byte, error) {
 	return json.Marshal(value)
 }
 
+func (v ClipboardPolicy) Validate() error {
+	var violations []FieldViolation
+	if v.MaxTextBytes == 0 {
+		violations = append(violations, FieldViolation{Field: "max_text_bytes", Code: "required"})
+	}
+	if v.MaxTextBytes != 0 && v.MaxTextBytes < 1 {
+		violations = append(violations, FieldViolation{Field: "max_text_bytes", Code: "minimum"})
+	}
+	if v.MaxTextBytes > 65536 {
+		violations = append(violations, FieldViolation{Field: "max_text_bytes", Code: "maximum"})
+	}
+	if v.MaxUpdatesPerMinute == 0 {
+		violations = append(violations, FieldViolation{Field: "max_updates_per_minute", Code: "required"})
+	}
+	if v.MaxUpdatesPerMinute != 0 && v.MaxUpdatesPerMinute < 1 {
+		violations = append(violations, FieldViolation{Field: "max_updates_per_minute", Code: "minimum"})
+	}
+	if v.MaxUpdatesPerMinute > 120 {
+		violations = append(violations, FieldViolation{Field: "max_updates_per_minute", Code: "maximum"})
+	}
+	if len(violations) > 0 {
+		return ValidationError{Violations: violations}
+	}
+	return nil
+}
+
+func DecodeClipboardPolicy(data []byte) (ClipboardPolicy, error) {
+	var value ClipboardPolicy
+	if len(data) > 1024*1024 {
+		return value, errors.New("protocol payload exceeds limit")
+	}
+	var fields map[string]json.RawMessage
+	if err := json.Unmarshal(data, &fields); err != nil {
+		return value, err
+	}
+	if raw, ok := fields["client_to_provider_enabled"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "client_to_provider_enabled", Code: "required"}}}
+	}
+	if raw, ok := fields["max_text_bytes"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "max_text_bytes", Code: "required"}}}
+	}
+	if raw, ok := fields["max_updates_per_minute"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "max_updates_per_minute", Code: "required"}}}
+	}
+	if raw, ok := fields["provider_to_client_enabled"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "provider_to_client_enabled", Code: "required"}}}
+	}
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	decoder.DisallowUnknownFields()
+	if err := decoder.Decode(&value); err != nil {
+		return value, err
+	}
+	var trailing any
+	if err := decoder.Decode(&trailing); err != io.EOF {
+		if err == nil {
+			return value, errors.New("trailing JSON value")
+		}
+		return value, err
+	}
+	if err := value.Validate(); err != nil {
+		return value, err
+	}
+	return value, nil
+}
+
+func EncodeClipboardPolicy(value ClipboardPolicy) ([]byte, error) {
+	if err := value.Validate(); err != nil {
+		return nil, err
+	}
+	return json.Marshal(value)
+}
+
 func (v ClipboardText) Validate() error {
 	var violations []FieldViolation
 	if v.Text == "" {
@@ -1934,6 +2032,194 @@ func EncodeFieldViolation(value FieldViolation) ([]byte, error) {
 	return json.Marshal(value)
 }
 
+func (v GatewayClipboardAudit) Validate() error {
+	var violations []FieldViolation
+	if v.Version == "" {
+		violations = append(violations, FieldViolation{Field: "version", Code: "required"})
+	}
+	if v.Version != "1" && v.Version != "" {
+		violations = append(violations, FieldViolation{Field: "version", Code: "invalid_value"})
+	}
+	if v.SessionID == "" {
+		violations = append(violations, FieldViolation{Field: "session_id", Code: "required"})
+	}
+	if len(v.SessionID) < 1 && v.SessionID != "" {
+		violations = append(violations, FieldViolation{Field: "session_id", Code: "min_length"})
+	}
+	if len(v.SessionID) > 128 {
+		violations = append(violations, FieldViolation{Field: "session_id", Code: "max_length"})
+	}
+	if v.Direction == "" {
+		violations = append(violations, FieldViolation{Field: "direction", Code: "required"})
+	}
+	if v.Direction != "" && !(v.Direction == "client_to_provider" || v.Direction == "provider_to_client") {
+		violations = append(violations, FieldViolation{Field: "direction", Code: "invalid_value"})
+	}
+	if v.Outcome == "" {
+		violations = append(violations, FieldViolation{Field: "outcome", Code: "required"})
+	}
+	if v.Outcome != "" && !(v.Outcome == "forwarded" || v.Outcome == "suppressed" || v.Outcome == "rejected") {
+		violations = append(violations, FieldViolation{Field: "outcome", Code: "invalid_value"})
+	}
+	if v.TextBytes != 0 && v.TextBytes < 0 {
+		violations = append(violations, FieldViolation{Field: "text_bytes", Code: "minimum"})
+	}
+	if v.TextBytes > 65536 {
+		violations = append(violations, FieldViolation{Field: "text_bytes", Code: "maximum"})
+	}
+	if v.Reason == "" {
+		violations = append(violations, FieldViolation{Field: "reason", Code: "required"})
+	}
+	if v.Reason != "" && !(v.Reason == "forwarded" || v.Reason == "loop" || v.Reason == "policy" || v.Reason == "rate" || v.Reason == "provider" || v.Reason == "malformed") {
+		violations = append(violations, FieldViolation{Field: "reason", Code: "invalid_value"})
+	}
+	if len(violations) > 0 {
+		return ValidationError{Violations: violations}
+	}
+	return nil
+}
+
+func DecodeGatewayClipboardAudit(data []byte) (GatewayClipboardAudit, error) {
+	var value GatewayClipboardAudit
+	if len(data) > 1024*1024 {
+		return value, errors.New("protocol payload exceeds limit")
+	}
+	var fields map[string]json.RawMessage
+	if err := json.Unmarshal(data, &fields); err != nil {
+		return value, err
+	}
+	if raw, ok := fields["direction"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "direction", Code: "required"}}}
+	}
+	if raw, ok := fields["outcome"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "outcome", Code: "required"}}}
+	}
+	if raw, ok := fields["reason"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "reason", Code: "required"}}}
+	}
+	if raw, ok := fields["session_id"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "session_id", Code: "required"}}}
+	}
+	if raw, ok := fields["text_bytes"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "text_bytes", Code: "required"}}}
+	}
+	if raw, ok := fields["version"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "version", Code: "required"}}}
+	}
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	decoder.DisallowUnknownFields()
+	if err := decoder.Decode(&value); err != nil {
+		return value, err
+	}
+	var trailing any
+	if err := decoder.Decode(&trailing); err != io.EOF {
+		if err == nil {
+			return value, errors.New("trailing JSON value")
+		}
+		return value, err
+	}
+	if err := value.Validate(); err != nil {
+		return value, err
+	}
+	return value, nil
+}
+
+func EncodeGatewayClipboardAudit(value GatewayClipboardAudit) ([]byte, error) {
+	if err := value.Validate(); err != nil {
+		return nil, err
+	}
+	return json.Marshal(value)
+}
+
+func (v GatewayClipboardText) Validate() error {
+	var violations []FieldViolation
+	if v.Direction == "" {
+		violations = append(violations, FieldViolation{Field: "direction", Code: "required"})
+	}
+	if v.Direction != "" && !(v.Direction == "client_to_provider" || v.Direction == "provider_to_client") {
+		violations = append(violations, FieldViolation{Field: "direction", Code: "invalid_value"})
+	}
+	if v.Text == "" {
+		violations = append(violations, FieldViolation{Field: "text", Code: "required"})
+	}
+	if len(v.Text) > 65536 {
+		violations = append(violations, FieldViolation{Field: "text", Code: "max_length"})
+	}
+	if len(v.Text) > 65536 {
+		violations = append(violations, FieldViolation{Field: "text", Code: "max_bytes"})
+	}
+	if v.Encoding == "" {
+		violations = append(violations, FieldViolation{Field: "encoding", Code: "required"})
+	}
+	if v.Encoding != "utf-8" && v.Encoding != "" {
+		violations = append(violations, FieldViolation{Field: "encoding", Code: "invalid_value"})
+	}
+	if v.LoopToken == "" {
+		violations = append(violations, FieldViolation{Field: "loop_token", Code: "required"})
+	}
+	if len(v.LoopToken) < 16 && v.LoopToken != "" {
+		violations = append(violations, FieldViolation{Field: "loop_token", Code: "min_length"})
+	}
+	if len(v.LoopToken) > 128 {
+		violations = append(violations, FieldViolation{Field: "loop_token", Code: "max_length"})
+	}
+	if v.LoopToken != "" {
+		if _, err := base64.RawURLEncoding.Strict().DecodeString(v.LoopToken); err != nil {
+			violations = append(violations, FieldViolation{Field: "loop_token", Code: "invalid_format"})
+		}
+	}
+	if len(violations) > 0 {
+		return ValidationError{Violations: violations}
+	}
+	return nil
+}
+
+func DecodeGatewayClipboardText(data []byte) (GatewayClipboardText, error) {
+	var value GatewayClipboardText
+	if len(data) > 1024*1024 {
+		return value, errors.New("protocol payload exceeds limit")
+	}
+	var fields map[string]json.RawMessage
+	if err := json.Unmarshal(data, &fields); err != nil {
+		return value, err
+	}
+	if raw, ok := fields["direction"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "direction", Code: "required"}}}
+	}
+	if raw, ok := fields["encoding"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "encoding", Code: "required"}}}
+	}
+	if raw, ok := fields["loop_token"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "loop_token", Code: "required"}}}
+	}
+	if raw, ok := fields["text"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "text", Code: "required"}}}
+	}
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	decoder.DisallowUnknownFields()
+	if err := decoder.Decode(&value); err != nil {
+		return value, err
+	}
+	var trailing any
+	if err := decoder.Decode(&trailing); err != io.EOF {
+		if err == nil {
+			return value, errors.New("trailing JSON value")
+		}
+		return value, err
+	}
+	if err := value.Validate(); err != nil {
+		return value, err
+	}
+	return value, nil
+}
+
+func EncodeGatewayClipboardText(value GatewayClipboardText) ([]byte, error) {
+	if err := value.Validate(); err != nil {
+		return nil, err
+	}
+	return json.Marshal(value)
+}
+
 func (v GatewayDrain) Validate() error {
 	var violations []FieldViolation
 	if v.Version == "" {
@@ -3082,6 +3368,12 @@ func (v ProviderSessionWork) Validate() error {
 	if len(v.ServerCertificatePem) > 32768 {
 		violations = append(violations, FieldViolation{Field: "server_certificate_pem", Code: "max_length"})
 	}
+	if reflect.DeepEqual(v.ClipboardPolicy, ClipboardPolicy{}) {
+		violations = append(violations, FieldViolation{Field: "clipboard_policy", Code: "required"})
+	}
+	if err := v.ClipboardPolicy.Validate(); err != nil {
+		violations = append(violations, FieldViolation{Field: "clipboard_policy", Code: "invalid_object"})
+	}
 	if len(violations) > 0 {
 		return ValidationError{Violations: violations}
 	}
@@ -3109,6 +3401,9 @@ func DecodeProviderSessionWork(data []byte) (ProviderSessionWork, error) {
 	if raw, ok := fields["client_private_key_pem"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
 		return value, ValidationError{Violations: []FieldViolation{{Field: "client_private_key_pem", Code: "required"}}}
 	}
+	if raw, ok := fields["clipboard_policy"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "clipboard_policy", Code: "required"}}}
+	}
 	if raw, ok := fields["expires_at"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
 		return value, ValidationError{Violations: []FieldViolation{{Field: "expires_at", Code: "required"}}}
 	}
@@ -3124,6 +3419,9 @@ func DecodeProviderSessionWork(data []byte) (ProviderSessionWork, error) {
 	if raw, ok := fields["policy_version_id"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
 		return value, ValidationError{Violations: []FieldViolation{{Field: "policy_version_id", Code: "required"}}}
 	}
+	if raw, ok := fields["provider_application_termination_allowed"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
+		return value, ValidationError{Violations: []FieldViolation{{Field: "provider_application_termination_allowed", Code: "required"}}}
+	}
 	if raw, ok := fields["provider_identity"]; !ok || bytes.Equal(bytes.TrimSpace(raw), []byte("null")) {
 		return value, ValidationError{Violations: []FieldViolation{{Field: "provider_identity", Code: "required"}}}
 	}

gen/manifest.json

@@ -12,7 +12,7 @@
       "2"
     ]
   },
-  "generator_sha256": "e9c6ee1541585fcb00dcc5e94a5a6d93dbe3a719a5c545f31e5eda268f2638ab",
+  "generator_sha256": "922983e07a8ecc559771778fbf139155b14664742d9873be062880102777dccb",
   "protocol_version": "1.0.0",
-  "schema_sha256": "792abfb9cfe70e79911d499d76c009ab848713278bc240b88576df520580e480"
+  "schema_sha256": "e98c75ef81bbeac6be2b8f11202c1ffecec0aa515b48576a26756290e99d5dd8"
 }

gen/rust/protocol.rs

@@ -1,6 +1,6 @@
 // Code generated by tools/generate.py; DO NOT EDIT.
 #![allow(non_snake_case)]
-pub const SCHEMA_SHA256: &str = "792abfb9cfe70e79911d499d76c009ab848713278bc240b88576df520580e480";
+pub const SCHEMA_SHA256: &str = "e98c75ef81bbeac6be2b8f11202c1ffecec0aa515b48576a26756290e99d5dd8";
 pub const CURRENT_WIRE_VERSION: &str = "1";
 pub const N_MINUS_1_WIRE_VERSION: &str = "0";
 pub const N_MINUS_2_WIRE_VERSION: &str = "-1";
@@ -10,6 +10,27 @@ pub type JsonObject = std::collections::BTreeMap<String, String>;
 pub struct ValidationError { pub field: &'static str, pub code: &'static str }
 impl ValidationError { pub const fn new(field: &'static str, code: &'static str) -> Self { Self { field, code } } }
 
+fn base64url_value(value: u8) -> Option<u8> {
+    match value {
+        b'A'..=b'Z' => Some(value - b'A'),
+        b'a'..=b'z' => Some(value - b'a' + 26),
+        b'0'..=b'9' => Some(value - b'0' + 52),
+        b'-' => Some(62),
+        b'_' => Some(63),
+        _ => None,
+    }
+}
+fn valid_base64_url(value: &str) -> bool {
+    let bytes = value.as_bytes();
+    if bytes.is_empty() || bytes.iter().any(|byte| base64url_value(*byte).is_none()) { return false; }
+    match bytes.len() % 4 {
+        0 => true,
+        2 => base64url_value(*bytes.last().unwrap()).unwrap() & 0x0f == 0,
+        3 => base64url_value(*bytes.last().unwrap()).unwrap() & 0x03 == 0,
+        _ => false,
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct AllocationPolicy {
     minimumKbps: i64,
@@ -259,6 +280,7 @@ impl ChannelFrame {
         if self.fragmentCount > 16 { return Err(ValidationError::new("fragment_count", "maximum")); }
         if self.timestampMs < 0 { return Err(ValidationError::new("timestamp_ms", "minimum")); }
         if self.payload.len() > 87384 { return Err(ValidationError::new("payload", "max_length")); }
+        if self.payload.as_bytes().len() > 65536 { return Err(ValidationError::new("payload", "max_bytes")); }
         if self.fragmentIndex >= self.fragmentCount { return Err(ValidationError::new("fragment_index", "invalid_order")); }
         Ok(())
     }
@@ -272,6 +294,33 @@ impl ChannelFrame {
     pub fn payload(&self) -> &String { &self.payload }
 }
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ClipboardPolicy {
+    clientToProviderEnabled: bool,
+    providerToClientEnabled: bool,
+    maxTextBytes: i64,
+    maxUpdatesPerMinute: i64,
+}
+
+impl ClipboardPolicy {
+    pub fn new(clientToProviderEnabled: bool, providerToClientEnabled: bool, maxTextBytes: i64, maxUpdatesPerMinute: i64) -> Result<Self, ValidationError> {
+        let value = Self { clientToProviderEnabled, providerToClientEnabled, maxTextBytes, maxUpdatesPerMinute };
+        value.validate()?;
+        Ok(value)
+    }
+    pub fn validate(&self) -> Result<(), ValidationError> {
+        if self.maxTextBytes < 1 { return Err(ValidationError::new("max_text_bytes", "minimum")); }
+        if self.maxTextBytes > 65536 { return Err(ValidationError::new("max_text_bytes", "maximum")); }
+        if self.maxUpdatesPerMinute < 1 { return Err(ValidationError::new("max_updates_per_minute", "minimum")); }
+        if self.maxUpdatesPerMinute > 120 { return Err(ValidationError::new("max_updates_per_minute", "maximum")); }
+        Ok(())
+    }
+    pub fn clientToProviderEnabled(&self) -> &bool { &self.clientToProviderEnabled }
+    pub fn providerToClientEnabled(&self) -> &bool { &self.providerToClientEnabled }
+    pub fn maxTextBytes(&self) -> &i64 { &self.maxTextBytes }
+    pub fn maxUpdatesPerMinute(&self) -> &i64 { &self.maxUpdatesPerMinute }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct ClipboardText {
     text: String,
@@ -612,6 +661,73 @@ impl FieldViolation {
     pub fn code(&self) -> &String { &self.code }
 }
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct GatewayClipboardAudit {
+    version: String,
+    sessionId: String,
+    direction: String,
+    outcome: String,
+    textBytes: i64,
+    reason: String,
+}
+
+impl GatewayClipboardAudit {
+    pub fn new(version: String, sessionId: String, direction: String, outcome: String, textBytes: i64, reason: String) -> Result<Self, ValidationError> {
+        let value = Self { version, sessionId, direction, outcome, textBytes, reason };
+        value.validate()?;
+        Ok(value)
+    }
+    pub fn validate(&self) -> Result<(), ValidationError> {
+        if self.version != "1" { return Err(ValidationError::new("version", "invalid_value")); }
+        if self.sessionId.is_empty() { return Err(ValidationError::new("session_id", "required")); }
+        if !self.sessionId.is_empty() && self.sessionId.len() < 1 { return Err(ValidationError::new("session_id", "min_length")); }
+        if self.sessionId.len() > 128 { return Err(ValidationError::new("session_id", "max_length")); }
+        if self.direction != "client_to_provider" && self.direction != "provider_to_client" { return Err(ValidationError::new("direction", "invalid_value")); }
+        if self.outcome != "forwarded" && self.outcome != "suppressed" && self.outcome != "rejected" { return Err(ValidationError::new("outcome", "invalid_value")); }
+        if self.textBytes < 0 { return Err(ValidationError::new("text_bytes", "minimum")); }
+        if self.textBytes > 65536 { return Err(ValidationError::new("text_bytes", "maximum")); }
+        if self.reason != "forwarded" && self.reason != "loop" && self.reason != "policy" && self.reason != "rate" && self.reason != "provider" && self.reason != "malformed" { return Err(ValidationError::new("reason", "invalid_value")); }
+        Ok(())
+    }
+    pub fn version(&self) -> &String { &self.version }
+    pub fn sessionId(&self) -> &String { &self.sessionId }
+    pub fn direction(&self) -> &String { &self.direction }
+    pub fn outcome(&self) -> &String { &self.outcome }
+    pub fn textBytes(&self) -> &i64 { &self.textBytes }
+    pub fn reason(&self) -> &String { &self.reason }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct GatewayClipboardText {
+    direction: String,
+    text: String,
+    encoding: String,
+    loopToken: String,
+}
+
+impl GatewayClipboardText {
+    pub fn new(direction: String, text: String, encoding: String, loopToken: String) -> Result<Self, ValidationError> {
+        let value = Self { direction, text, encoding, loopToken };
+        value.validate()?;
+        Ok(value)
+    }
+    pub fn validate(&self) -> Result<(), ValidationError> {
+        if self.direction != "client_to_provider" && self.direction != "provider_to_client" { return Err(ValidationError::new("direction", "invalid_value")); }
+        if self.text.len() > 65536 { return Err(ValidationError::new("text", "max_length")); }
+        if self.text.as_bytes().len() > 65536 { return Err(ValidationError::new("text", "max_bytes")); }
+        if self.encoding != "utf-8" { return Err(ValidationError::new("encoding", "invalid_value")); }
+        if self.loopToken.is_empty() { return Err(ValidationError::new("loop_token", "required")); }
+        if !self.loopToken.is_empty() && self.loopToken.len() < 16 { return Err(ValidationError::new("loop_token", "min_length")); }
+        if self.loopToken.len() > 128 { return Err(ValidationError::new("loop_token", "max_length")); }
+        if !valid_base64_url(self.loopToken.as_str()) { return Err(ValidationError::new("loop_token", "invalid_format")); }
+        Ok(())
+    }
+    pub fn direction(&self) -> &String { &self.direction }
+    pub fn text(&self) -> &String { &self.text }
+    pub fn encoding(&self) -> &String { &self.encoding }
+    pub fn loopToken(&self) -> &String { &self.loopToken }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct GatewayDrain {
     version: String,
@@ -1001,11 +1117,13 @@ pub struct ProviderSessionWork {
     clientCertificatePem: String,
     clientPrivateKeyPem: String,
     serverCertificatePem: String,
+    clipboardPolicy: ClipboardPolicy,
+    providerApplicationTerminationAllowed: bool,
 }
 
 impl ProviderSessionWork {
-    pub fn new(version: String, sessionId: String, gatewayId: String, reconnectSequence: i64, expiresAt: String, providerProfile: String, providerIdentity: String, policyVersionId: String, applicationId: String, clientId: String, managementHost: String, managementPort: i64, streamHost: String, streamPort: i64, clientCertificatePem: String, clientPrivateKeyPem: String, serverCertificatePem: String) -> Result<Self, ValidationError> {
-        let value = Self { version, sessionId, gatewayId, reconnectSequence, expiresAt, providerProfile, providerIdentity, policyVersionId, applicationId, clientId, managementHost, managementPort, streamHost, streamPort, clientCertificatePem, clientPrivateKeyPem, serverCertificatePem };
+    pub fn new(version: String, sessionId: String, gatewayId: String, reconnectSequence: i64, expiresAt: String, providerProfile: String, providerIdentity: String, policyVersionId: String, applicationId: String, clientId: String, managementHost: String, managementPort: i64, streamHost: String, streamPort: i64, clientCertificatePem: String, clientPrivateKeyPem: String, serverCertificatePem: String, clipboardPolicy: ClipboardPolicy, providerApplicationTerminationAllowed: bool) -> Result<Self, ValidationError> {
+        let value = Self { version, sessionId, gatewayId, reconnectSequence, expiresAt, providerProfile, providerIdentity, policyVersionId, applicationId, clientId, managementHost, managementPort, streamHost, streamPort, clientCertificatePem, clientPrivateKeyPem, serverCertificatePem, clipboardPolicy, providerApplicationTerminationAllowed };
         value.validate()?;
         Ok(value)
     }
@@ -1051,6 +1169,7 @@ impl ProviderSessionWork {
         if self.serverCertificatePem.is_empty() { return Err(ValidationError::new("server_certificate_pem", "required")); }
         if !self.serverCertificatePem.is_empty() && self.serverCertificatePem.len() < 1 { return Err(ValidationError::new("server_certificate_pem", "min_length")); }
         if self.serverCertificatePem.len() > 32768 { return Err(ValidationError::new("server_certificate_pem", "max_length")); }
+        self.clipboardPolicy.validate().map_err(|_| ValidationError::new("clipboard_policy", "invalid_object"))?;
         Ok(())
     }
     pub fn version(&self) -> &String { &self.version }
@@ -1070,6 +1189,8 @@ impl ProviderSessionWork {
     pub fn clientCertificatePem(&self) -> &String { &self.clientCertificatePem }
     pub fn clientPrivateKeyPem(&self) -> &String { &self.clientPrivateKeyPem }
     pub fn serverCertificatePem(&self) -> &String { &self.serverCertificatePem }
+    pub fn clipboardPolicy(&self) -> &ClipboardPolicy { &self.clipboardPolicy }
+    pub fn providerApplicationTerminationAllowed(&self) -> &bool { &self.providerApplicationTerminationAllowed }
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]

gen/swift/Protocol.swift

@@ -1,12 +1,21 @@
 // Code generated by tools/generate.py; DO NOT EDIT.
 import Foundation
 public typealias JSONObject = [String: String]
-public let schemaSHA256 = "792abfb9cfe70e79911d499d76c009ab848713278bc240b88576df520580e480"
+public let schemaSHA256 = "e98c75ef81bbeac6be2b8f11202c1ffecec0aa515b48576a26756290e99d5dd8"
 public let currentWireVersion = "1"
 public let nMinus1WireVersion = "0"
 public let nMinus2WireVersion = "-1"
 public struct ContractValidationError: Error, Equatable { public let field: String; public let code: String }
 private struct AnyCodingKey: CodingKey { let stringValue: String; let intValue: Int?; init?(stringValue: String) { self.stringValue = stringValue; self.intValue = nil }; init?(intValue: Int) { self.stringValue = String(intValue); self.intValue = intValue } }
+private func validBase64URL(_ value: String) -> Bool {
+    guard !value.isEmpty, value.utf8.allSatisfy({ byte in
+        (byte >= 65 && byte <= 90) || (byte >= 97 && byte <= 122) || (byte >= 48 && byte <= 57) || byte == 45 || byte == 95
+    }) else { return false }
+    let padding = String(repeating: "=", count: (4 - value.utf8.count % 4) % 4)
+    let standard = value.replacingOccurrences(of: "-", with: "+").replacingOccurrences(of: "_", with: "/") + padding
+    guard let decoded = Data(base64Encoded: standard) else { return false }
+    return decoded.base64EncodedString().replacingOccurrences(of: "+", with: "-").replacingOccurrences(of: "/", with: "_").replacingOccurrences(of: "=", with: "") == value
+}
 
 public struct AllocationPolicy: Codable, Equatable {
     public let minimumKbps: Int64
@@ -343,6 +352,7 @@ public struct ChannelFrame: Codable, Equatable {
         if self.fragmentCount > 16 { throw ContractValidationError(field: "fragment_count", code: "maximum") }
         if self.timestampMs < 0 { throw ContractValidationError(field: "timestamp_ms", code: "minimum") }
         if self.payload.utf8.count > 87384 { throw ContractValidationError(field: "payload", code: "max_length") }
+        if self.payload.utf8.count > 65536 { throw ContractValidationError(field: "payload", code: "max_bytes") }
         if fragmentIndex >= fragmentCount { throw ContractValidationError(field: "fragment_index", code: "invalid_order") }
     }
 
@@ -350,6 +360,44 @@ public struct ChannelFrame: Codable, Equatable {
     public func encodeJSON() throws -> Data { try validate(); return try JSONEncoder().encode(self) }
 }
 
+public struct ClipboardPolicy: Codable, Equatable {
+    public let clientToProviderEnabled: Bool
+    public let providerToClientEnabled: Bool
+    public let maxTextBytes: Int64
+    public let maxUpdatesPerMinute: Int64
+    enum CodingKeys: String, CodingKey {
+        case clientToProviderEnabled = "client_to_provider_enabled"
+        case providerToClientEnabled = "provider_to_client_enabled"
+        case maxTextBytes = "max_text_bytes"
+        case maxUpdatesPerMinute = "max_updates_per_minute"
+    }
+
+    public init(clientToProviderEnabled: Bool, providerToClientEnabled: Bool, maxTextBytes: Int64, maxUpdatesPerMinute: Int64) throws {
+        self.clientToProviderEnabled = clientToProviderEnabled
+        self.providerToClientEnabled = providerToClientEnabled
+        self.maxTextBytes = maxTextBytes
+        self.maxUpdatesPerMinute = maxUpdatesPerMinute
+        try validate()
+    }
+
+    public init(from decoder: Decoder) throws {
+        let all = try decoder.container(keyedBy: AnyCodingKey.self)
+        for key in all.allKeys where CodingKeys(stringValue: key.stringValue) == nil { throw ContractValidationError(field: key.stringValue, code: "unknown_field") }
+        let c = try decoder.container(keyedBy: CodingKeys.self)
+        try self.init(clientToProviderEnabled: try c.decode(Bool.self, forKey: .clientToProviderEnabled), providerToClientEnabled: try c.decode(Bool.self, forKey: .providerToClientEnabled), maxTextBytes: try c.decode(Int64.self, forKey: .maxTextBytes), maxUpdatesPerMinute: try c.decode(Int64.self, forKey: .maxUpdatesPerMinute))
+    }
+
+    public func validate() throws {
+        if self.maxTextBytes < 1 { throw ContractValidationError(field: "max_text_bytes", code: "minimum") }
+        if self.maxTextBytes > 65536 { throw ContractValidationError(field: "max_text_bytes", code: "maximum") }
+        if self.maxUpdatesPerMinute < 1 { throw ContractValidationError(field: "max_updates_per_minute", code: "minimum") }
+        if self.maxUpdatesPerMinute > 120 { throw ContractValidationError(field: "max_updates_per_minute", code: "maximum") }
+    }
+
+    public static func decodeJSON(_ data: Data) throws -> Self { try JSONDecoder().decode(Self.self, from: data) }
+    public func encodeJSON() throws -> Data { try validate(); return try JSONEncoder().encode(self) }
+}
+
 public struct ClipboardText: Codable, Equatable {
     public let text: String
     public let encoding: String
@@ -809,6 +857,97 @@ public struct FieldViolation: Codable, Equatable {
     public func encodeJSON() throws -> Data { try validate(); return try JSONEncoder().encode(self) }
 }
 
+public struct GatewayClipboardAudit: Codable, Equatable {
+    public let version: String
+    public let sessionId: String
+    public let direction: String
+    public let outcome: String
+    public let textBytes: Int64
+    public let reason: String
+    enum CodingKeys: String, CodingKey {
+        case version = "version"
+        case sessionId = "session_id"
+        case direction = "direction"
+        case outcome = "outcome"
+        case textBytes = "text_bytes"
+        case reason = "reason"
+    }
+
+    public init(version: String, sessionId: String, direction: String, outcome: String, textBytes: Int64, reason: String) throws {
+        self.version = version
+        self.sessionId = sessionId
+        self.direction = direction
+        self.outcome = outcome
+        self.textBytes = textBytes
+        self.reason = reason
+        try validate()
+    }
+
+    public init(from decoder: Decoder) throws {
+        let all = try decoder.container(keyedBy: AnyCodingKey.self)
+        for key in all.allKeys where CodingKeys(stringValue: key.stringValue) == nil { throw ContractValidationError(field: key.stringValue, code: "unknown_field") }
+        let c = try decoder.container(keyedBy: CodingKeys.self)
+        try self.init(version: try c.decode(String.self, forKey: .version), sessionId: try c.decode(String.self, forKey: .sessionId), direction: try c.decode(String.self, forKey: .direction), outcome: try c.decode(String.self, forKey: .outcome), textBytes: try c.decode(Int64.self, forKey: .textBytes), reason: try c.decode(String.self, forKey: .reason))
+    }
+
+    public func validate() throws {
+        if self.version != "1" { throw ContractValidationError(field: "version", code: "invalid_value") }
+        if self.sessionId.isEmpty { throw ContractValidationError(field: "session_id", code: "required") }
+        if !self.sessionId.isEmpty && self.sessionId.utf8.count < 1 { throw ContractValidationError(field: "session_id", code: "min_length") }
+        if self.sessionId.utf8.count > 128 { throw ContractValidationError(field: "session_id", code: "max_length") }
+        if !["client_to_provider", "provider_to_client"].contains(self.direction) { throw ContractValidationError(field: "direction", code: "invalid_value") }
+        if !["forwarded", "suppressed", "rejected"].contains(self.outcome) { throw ContractValidationError(field: "outcome", code: "invalid_value") }
+        if self.textBytes < 0 { throw ContractValidationError(field: "text_bytes", code: "minimum") }
+        if self.textBytes > 65536 { throw ContractValidationError(field: "text_bytes", code: "maximum") }
+        if !["forwarded", "loop", "policy", "rate", "provider", "malformed"].contains(self.reason) { throw ContractValidationError(field: "reason", code: "invalid_value") }
+    }
+
+    public static func decodeJSON(_ data: Data) throws -> Self { try JSONDecoder().decode(Self.self, from: data) }
+    public func encodeJSON() throws -> Data { try validate(); return try JSONEncoder().encode(self) }
+}
+
+public struct GatewayClipboardText: Codable, Equatable {
+    public let direction: String
+    public let text: String
+    public let encoding: String
+    public let loopToken: String
+    enum CodingKeys: String, CodingKey {
+        case direction = "direction"
+        case text = "text"
+        case encoding = "encoding"
+        case loopToken = "loop_token"
+    }
+
+    public init(direction: String, text: String, encoding: String, loopToken: String) throws {
+        self.direction = direction
+        self.text = text
+        self.encoding = encoding
+        self.loopToken = loopToken
+        try validate()
+    }
+
+    public init(from decoder: Decoder) throws {
+        let all = try decoder.container(keyedBy: AnyCodingKey.self)
+        for key in all.allKeys where CodingKeys(stringValue: key.stringValue) == nil { throw ContractValidationError(field: key.stringValue, code: "unknown_field") }
+        let c = try decoder.container(keyedBy: CodingKeys.self)
+        try self.init(direction: try c.decode(String.self, forKey: .direction), text: try c.decode(String.self, forKey: .text), encoding: try c.decode(String.self, forKey: .encoding), loopToken: try c.decode(String.self, forKey: .loopToken))
+    }
+
+    public func validate() throws {
+        if !["client_to_provider", "provider_to_client"].contains(self.direction) { throw ContractValidationError(field: "direction", code: "invalid_value") }
+        if self.text.utf8.count > 65536 { throw ContractValidationError(field: "text", code: "max_length") }
+        if self.text.utf8.count > 65536 { throw ContractValidationError(field: "text", code: "max_bytes") }
+        if self.encoding != "utf-8" { throw ContractValidationError(field: "encoding", code: "invalid_value") }
+        if self.loopToken.isEmpty { throw ContractValidationError(field: "loop_token", code: "required") }
+        if !self.loopToken.isEmpty && self.loopToken.utf8.count < 16 { throw ContractValidationError(field: "loop_token", code: "min_length") }
+        if self.loopToken.utf8.count > 128 { throw ContractValidationError(field: "loop_token", code: "max_length") }
+        if !validBase64URL(self.loopToken) { throw ContractValidationError(field: "loop_token", code: "invalid_format") }
+    }
+
+    public static func decodeJSON(_ data: Data) throws -> Self { try JSONDecoder().decode(Self.self, from: data) }
+    public func encodeJSON() throws -> Data { try validate(); return try JSONEncoder().encode(self) }
+}
+
 public struct GatewayDrain: Codable, Equatable {
     public let version: String
     public let gatewayId: String
@@ -1328,6 +1467,8 @@ public struct ProviderSessionWork: Codable, Equatable {
     public let clientCertificatePem: String
     public let clientPrivateKeyPem: String
     public let serverCertificatePem: String
+    public let clipboardPolicy: ClipboardPolicy
+    public let providerApplicationTerminationAllowed: Bool
     enum CodingKeys: String, CodingKey {
         case version = "version"
         case sessionId = "session_id"
@@ -1346,9 +1487,11 @@ public struct ProviderSessionWork: Codable, Equatable {
         case clientCertificatePem = "client_certificate_pem"
         case clientPrivateKeyPem = "client_private_key_pem"
         case serverCertificatePem = "server_certificate_pem"
+        case clipboardPolicy = "clipboard_policy"
+        case providerApplicationTerminationAllowed = "provider_application_termination_allowed"
     }
 
-    public init(version: String, sessionId: String, gatewayId: String, reconnectSequence: Int64, expiresAt: String, providerProfile: String, providerIdentity: String, policyVersionId: String, applicationId: String, clientId: String, managementHost: String, managementPort: Int64, streamHost: String, streamPort: Int64, clientCertificatePem: String, clientPrivateKeyPem: String, serverCertificatePem: String) throws {
+    public init(version: String, sessionId: String, gatewayId: String, reconnectSequence: Int64, expiresAt: String, providerProfile: String, providerIdentity: String, policyVersionId: String, applicationId: String, clientId: String, managementHost: String, managementPort: Int64, streamHost: String, streamPort: Int64, clientCertificatePem: String, clientPrivateKeyPem: String, serverCertificatePem: String, clipboardPolicy: ClipboardPolicy, providerApplicationTerminationAllowed: Bool) throws {
         self.version = version
         self.sessionId = sessionId
         self.gatewayId = gatewayId
@@ -1366,6 +1509,8 @@ public struct ProviderSessionWork: Codable, Equatable {
         self.clientCertificatePem = clientCertificatePem
         self.clientPrivateKeyPem = clientPrivateKeyPem
         self.serverCertificatePem = serverCertificatePem
+        self.clipboardPolicy = clipboardPolicy
+        self.providerApplicationTerminationAllowed = providerApplicationTerminationAllowed
         try validate()
     }
 
@@ -1373,7 +1518,7 @@ public struct ProviderSessionWork: Codable, Equatable {
         let all = try decoder.container(keyedBy: AnyCodingKey.self)
         for key in all.allKeys where CodingKeys(stringValue: key.stringValue) == nil { throw ContractValidationError(field: key.stringValue, code: "unknown_field") }
         let c = try decoder.container(keyedBy: CodingKeys.self)
-        try self.init(version: try c.decode(String.self, forKey: .version), sessionId: try c.decode(String.self, forKey: .sessionId), gatewayId: try c.decode(String.self, forKey: .gatewayId), reconnectSequence: try c.decode(Int64.self, forKey: .reconnectSequence), expiresAt: try c.decode(String.self, forKey: .expiresAt), providerProfile: try c.decode(String.self, forKey: .providerProfile), providerIdentity: try c.decode(String.self, forKey: .providerIdentity), policyVersionId: try c.decode(String.self, forKey: .policyVersionId), applicationId: try c.decode(String.self, forKey: .applicationId), clientId: try c.decode(String.self, forKey: .clientId), managementHost: try c.decode(String.self, forKey: .managementHost), managementPort: try c.decode(Int64.self, forKey: .managementPort), streamHost: try c.decode(String.self, forKey: .streamHost), streamPort: try c.decode(Int64.self, forKey: .streamPort), clientCertificatePem: try c.decode(String.self, forKey: .clientCertificatePem), clientPrivateKeyPem: try c.decode(String.self, forKey: .clientPrivateKeyPem), serverCertificatePem: try c.decode(String.self, forKey: .serverCertificatePem))
+        try self.init(version: try c.decode(String.self, forKey: .version), sessionId: try c.decode(String.self, forKey: .sessionId), gatewayId: try c.decode(String.self, forKey: .gatewayId), reconnectSequence: try c.decode(Int64.self, forKey: .reconnectSequence), expiresAt: try c.decode(String.self, forKey: .expiresAt), providerProfile: try c.decode(String.self, forKey: .providerProfile), providerIdentity: try c.decode(String.self, forKey: .providerIdentity), policyVersionId: try c.decode(String.self, forKey: .policyVersionId), applicationId: try c.decode(String.self, forKey: .applicationId), clientId: try c.decode(String.self, forKey: .clientId), managementHost: try c.decode(String.self, forKey: .managementHost), managementPort: try c.decode(Int64.self, forKey: .managementPort), streamHost: try c.decode(String.self, forKey: .streamHost), streamPort: try c.decode(Int64.self, forKey: .streamPort), clientCertificatePem: try c.decode(String.self, forKey: .clientCertificatePem), clientPrivateKeyPem: try c.decode(String.self, forKey: .clientPrivateKeyPem), serverCertificatePem: try c.decode(String.self, forKey: .serverCertificatePem), clipboardPolicy: try c.decode(ClipboardPolicy.self, forKey: .clipboardPolicy), providerApplicationTerminationAllowed: try c.decode(Bool.self, forKey: .providerApplicationTerminationAllowed))
     }
 
     public func validate() throws {
@@ -1419,6 +1564,7 @@ public struct ProviderSessionWork: Codable, Equatable {
         if self.serverCertificatePem.isEmpty { throw ContractValidationError(field: "server_certificate_pem", code: "required") }
         if !self.serverCertificatePem.isEmpty && self.serverCertificatePem.utf8.count < 1 { throw ContractValidationError(field: "server_certificate_pem", code: "min_length") }
         if self.serverCertificatePem.utf8.count > 32768 { throw ContractValidationError(field: "server_certificate_pem", code: "max_length") }
+        try self.clipboardPolicy.validate()
     }
 
     public static func decodeJSON(_ data: Data) throws -> Self { try JSONDecoder().decode(Self.self, from: data) }

openspec/changes/phase3c-apollo-input-feedback/.openspec.yaml

@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-07-29

openspec/changes/phase3c-apollo-input-feedback/design.md

@@ -0,0 +1,50 @@
+## Context
+
+The registered `input.sequenced.v1` flow has a payload bound but no typed
+payload grammar. RC5 also has no provider-to-client envelope for host
+termination, rumble, or HDR feedback. The Data Plane must translate these
+states to the provider without exposing Apollo packet formats or credentials.
+
+## Goals / Non-Goals
+
+**Goals:**
+
+- Define fixed, bounded, endian-explicit gateway payloads for keyboard, mouse,
+  UTF-8 text, and controller state.
+- Define a reliable control envelope for provider feedback and termination.
+- Define an explicit release operation for every pressed key/button/controller.
+- Keep provider packet encodings and endpoint details internal to the Data Plane.
+
+**Non-Goals:**
+
+- Touch, pen, motion, file transfer, binary clipboard, or provider-specific
+  packets.
+- Changing RC5, moving an existing tag, or making the Connection Server parse
+  streaming input.
+
+## Decisions
+
+- Define a new binary payload grammar beneath the existing registered flows.
+  This avoids changing the authenticated tunnel header while removing the
+  untyped `device`/opaque-payload ambiguity. JSON was rejected because input is
+  latency-sensitive and fixed binary bounds are simpler to validate before
+  allocation.
+- Input events use explicit event kinds and fixed payload lengths except UTF-8
+  text, which is limited to one valid Unicode scalar value. This permits exact
+  provider translation and deterministic cleanup.
+- Provider feedback and termination use the existing bidirectional reliable
+  control channel with a distinct magic, direction, type, and length. A new
+  channel was rejected because the existing channel is already authenticated,
+  reliable, and versioned.
+- Protocol contents and fixtures are finalized before a new immutable release
+  candidate is created. RC5 remains an unchanged dependency for current
+  consumers until they explicitly adopt the new revision.
+
+## Risks / Trade-offs
+
+- [New client adoption is required] -> retain RC5 unchanged and publish an
+  explicit capability/version mismatch before any provider allocation.
+- [Provider feedback can be high rate] -> allow only termination, rumble, and
+  HDR payload types with fixed maximum sizes; other types reject.
+- [Pressed-state loss during disconnect] -> gateway records accepted presses
+  and emits typed releases during cleanup before provider disconnect.

openspec/changes/phase3c-apollo-input-feedback/proposal.md

@@ -0,0 +1,40 @@
+## Why
+
+The RC5 tunnel register identifies a bounded sequenced-input flow but does not
+define typed input state or provider-to-client feedback. The native Apollo
+adapter cannot safely translate keyboard, mouse, UTF-8, controller, termination,
+rumble, or HDR state from an untyped payload.
+
+## What Changes
+
+- Define a typed, versioned gateway input envelope for keyboard, mouse, UTF-8,
+  and controller state.
+- Define bounded provider-feedback and provider-termination envelopes on the
+  existing reliable control direction.
+- Define a separate typed clipboard envelope and Server-owned per-session
+  direction, size, and rate policy so the gateway can prevent reflected loops
+  without exposing provider management material.
+- Define release semantics so gateway cleanup can emit real provider key/button
+  releases without a synthetic provider command.
+- Preserve RC5 unchanged; this change requires a new immutable Protocol version
+  after its fixtures and consumers are final.
+
+## Capabilities
+
+### New Capabilities
+
+- `gateway-input-feedback`: Typed Phase 3C gateway input, provider feedback,
+  termination, and release envelopes.
+
+### Modified Capabilities
+
+- None.
+
+## Impact
+
+- Protocol control and datagram registries, schemas, fixtures, and generated
+  Go/Rust/Swift bindings.
+- Data Plane gateway input/clipboard translation and host-feedback forwarding.
+- Connection Server mints only immutable clipboard policy in authenticated
+  provider work; it neither receives clipboard bytes nor inspects provider
+  packet payloads.

openspec/changes/phase3c-apollo-input-feedback/specs/gateway-input-feedback/spec.md

@@ -0,0 +1,79 @@
+## ADDED Requirements
+
+### Requirement: Typed sequenced input envelope
+The `input.sequenced.v1` payload SHALL begin with ASCII `VGI1`, a one-byte
+event kind, and one-byte payload length. It SHALL contain exactly one bounded
+keyboard, mouse-button, relative-mouse, UTF-8 scalar, or controller-state
+event. False keyboard/mouse state and zeroed controller state are explicit
+releases. Multibyte integer fields SHALL be big-endian. Unknown kinds,
+length mismatches, malformed UTF-8, unsupported controller indices, and
+reserved fields SHALL be rejected before provider translation.
+
+#### Scenario: Keyboard state change
+- **WHEN** a client sends a valid keyboard press or release envelope
+- **THEN** the gateway forwards the corresponding typed provider input on its
+  reliable keyboard channel and records the pressed state for cleanup.
+
+#### Scenario: Invalid input envelope
+- **WHEN** a client sends an envelope with an unknown event kind, invalid
+  length, malformed UTF-8 scalar, or nonzero reserved field
+- **THEN** the gateway rejects it without sending provider input or changing
+  pressed state.
+
+### Requirement: Explicit input release
+The typed input envelope SHALL represent release of each keyboard key,
+mouse button, and controller state. Gateway cleanup SHALL send a typed release
+for every accepted pressed state before provider disconnect; it SHALL NOT use
+an implementation-specific release-all provider command.
+
+#### Scenario: Tunnel cleanup with pressed input
+- **WHEN** a tunnel closes after accepted pressed keyboard, mouse, or
+  controller input
+- **THEN** the gateway emits the corresponding individual provider release
+  packets reliably before starting provider disconnect.
+
+### Requirement: Bounded provider feedback control envelope
+The registered bidirectional reliable `control.ack.v1` flow SHALL define an ASCII `VGF1` envelope
+with a direction byte, type byte, big-endian payload length, and exact payload
+bytes. Only host termination, rumble, and HDR feedback SHALL be valid from the
+gateway to the client; only IDR and FEC/loss feedback SHALL be valid from the
+client to the gateway. The envelope SHALL contain no provider address,
+certificate, credential, or opaque provider packet.
+
+#### Scenario: Host termination forwarding
+- **WHEN** the Apollo adapter receives an authenticated host termination
+  packet
+- **THEN** the gateway forwards a bounded `VGF1` termination envelope over
+  reliable Verse control and reports the provider state separately.
+
+#### Scenario: Unauthorized or malformed feedback
+- **WHEN** feedback is disabled by policy, has an invalid direction/type/length,
+  or contains a forbidden provider field
+- **THEN** the gateway rejects it without forwarding or provider mutation.
+
+### Requirement: Policy-bound text clipboard envelope
+The reliable `clipboard.text.v1` flow SHALL carry only a typed UTF-8 text
+envelope with exact direction and a 16--128 character canonical unpadded ASCII
+base64url loop token. The Server SHALL mint
+the enabled directions, maximum text bytes, and maximum updates per minute in
+authenticated provider work. The gateway SHALL reject disabled direction,
+unknown fields, files, file URLs, client folders, binary data, malformed UTF-8,
+oversized values, rates above policy, and reflected/replayed loop tokens. It
+SHALL not put clipboard content, provider routes, or credentials in telemetry,
+audit, state, or errors.
+
+#### Scenario: Clipboard audit metadata
+- **WHEN** the gateway successfully delivers, suppresses, or rejects a clipboard update
+- **THEN** it sends an authenticated Server audit record with only direction,
+  bounded byte count, outcome, and a fixed reason; it never includes text or
+  the loop token.
+
+#### Scenario: Clipboard delivery failure
+- **WHEN** provider-to-client control delivery fails
+- **THEN** the gateway does not report the update as forwarded.
+
+#### Scenario: Reflected clipboard value
+- **WHEN** a client-originated text value returns from the provider with the
+  matching retained token/value pair
+- **THEN** the gateway suppresses the reflected update without a second
+  provider mutation or client delivery.

openspec/changes/phase3c-apollo-input-feedback/tasks.md

@@ -0,0 +1,29 @@
+## 1. Contract and fixtures
+
+- [x] 1.1 Define the exact typed input and provider-feedback binary layouts in
+  the canonical frame documentation and registries.
+- [x] 1.2 Add positive and negative fixed-byte conformance fixtures for every
+  input, release, feedback, termination, reserved, and malformed case.
+- [x] 1.3 Update only source Protocol artifacts, regenerate bindings and the
+  manifest, and prove no generated drift.
+- [x] 1.4 Define policy-bound clipboard direction/rate/loop-token envelopes and
+  positive/negative deterministic conformance fixtures without adding provider
+  fields to a client-facing frame.
+
+## 2. Consumer qualification
+
+- [x] 2.1 Run Protocol validation and the Go, Rust, and Swift conformance
+  consumers against the new fixtures.
+- [ ] 2.2 Advance the Data Plane to the final immutable Protocol revision and
+  translate only the typed envelopes to provider control packets.
+- [x] 2.3 Add deterministic host-feedback forwarding and input-release tests
+  without provider endpoint or credential disclosure.
+- [ ] 2.4 Advance the Data Plane and Connection Server to the final clipboard
+  contract and prove disabled direction, malformed/oversized text, rate, loop,
+  and file/binary rejection against the authenticated provider path.
+
+## 3. Freeze
+
+- [ ] 3.1 Reconcile the canonical specification, OpenSpec tasks, source
+  provenance, and consumer fixture digest before creating a new immutable
+  Protocol release candidate.

proto/versevdi/control/v1/control.proto

@@ -32,3 +32,10 @@ message ClipboardText {
   string text = 1;
   string encoding = 2;
 }
+
+message GatewayClipboardText {
+  string direction = 1;
+  string text = 2;
+  string encoding = 3;
+  string loop_token = 4;
+}

proto/versevdi/tunnel/v1/tunnel.proto

@@ -135,6 +135,15 @@ message ProviderSessionWork {
   string client_private_key_pem = 15;
   string server_certificate_pem = 16;
   string client_id = 17;
+  ClipboardPolicy clipboard_policy = 18;
+  bool provider_application_termination_allowed = 19;
+}
+
+message ClipboardPolicy {
+  bool client_to_provider_enabled = 1;
+  bool provider_to_client_enabled = 2;
+  uint32 max_text_bytes = 3;
+  uint32 max_updates_per_minute = 4;
 }
 
 message ChannelFrame {
@@ -156,6 +165,15 @@ message ProviderState {
   repeated string channels = 5;
 }
 
+message GatewayClipboardAudit {
+  string version = 1;
+  string session_id = 2;
+  string direction = 3;
+  string outcome = 4;
+  uint32 text_bytes = 5;
+  string reason = 6;
+}
+
 message StableError {
   string version = 1;
   string code = 2;

registries/datagrams.json

@@ -2,11 +2,11 @@
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "max_frame_bytes": 65536,
   "datagrams": [
-    {"id": "control.ack.v1", "direction": "bidirectional", "max_payload_bytes": 1024},
+    {"id": "control.ack.v1", "direction": "bidirectional", "max_payload_bytes": 1024, "payload_profile": "gateway-feedback-v1"},
     {"id": "control.cancel.v1", "direction": "client-to-server", "max_payload_bytes": 2048},
     {"id": "clipboard.text.v1", "direction": "bidirectional", "max_payload_bytes": 65536},
     {"id": "media.video.v1", "direction": "server-to-client", "max_payload_bytes": 1200},
     {"id": "media.audio.v1", "direction": "server-to-client", "max_payload_bytes": 1200},
-    {"id": "input.sequenced.v1", "direction": "client-to-server", "max_payload_bytes": 1200}
+    {"id": "input.sequenced.v1", "direction": "client-to-server", "max_payload_bytes": 1200, "payload_profile": "gateway-input-v1"}
   ]
 }

schemas/control-v1.schema.json

@@ -335,6 +335,28 @@
         "encoding": {"type": "string", "const": "utf-8"}
       }
     },
+    "ClipboardPolicy": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["client_to_provider_enabled", "provider_to_client_enabled", "max_text_bytes", "max_updates_per_minute"],
+      "properties": {
+        "client_to_provider_enabled": {"type": "boolean"},
+        "provider_to_client_enabled": {"type": "boolean"},
+        "max_text_bytes": {"type": "integer", "minimum": 1, "maximum": 65536},
+        "max_updates_per_minute": {"type": "integer", "minimum": 1, "maximum": 120}
+      }
+    },
+    "GatewayClipboardText": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["direction", "text", "encoding", "loop_token"],
+      "properties": {
+        "direction": {"type": "string", "enum": ["client_to_provider", "provider_to_client"]},
+        "text": {"type": "string", "maxLength": 65536, "x-max-bytes": 65536},
+        "encoding": {"type": "string", "const": "utf-8"},
+        "loop_token": {"type": "string", "format": "base64url", "minLength": 16, "maxLength": 128}
+      }
+    },
     "VersionNegotiation": {
       "type": "object",
       "additionalProperties": false,
@@ -438,7 +460,7 @@
     "ProviderSessionWork": {
       "type": "object",
       "additionalProperties": false,
-      "required": ["version", "session_id", "gateway_id", "reconnect_sequence", "expires_at", "provider_profile", "provider_identity", "policy_version_id", "application_id", "client_id", "management_host", "management_port", "stream_host", "stream_port", "client_certificate_pem", "client_private_key_pem", "server_certificate_pem"],
+      "required": ["version", "session_id", "gateway_id", "reconnect_sequence", "expires_at", "provider_profile", "provider_identity", "policy_version_id", "application_id", "client_id", "management_host", "management_port", "stream_host", "stream_port", "client_certificate_pem", "client_private_key_pem", "server_certificate_pem", "clipboard_policy", "provider_application_termination_allowed"],
       "properties": {
         "version": {"type": "string", "const": "1"},
         "session_id": {"type": "string", "minLength": 1, "maxLength": 128},
@@ -456,7 +478,9 @@
         "stream_port": {"type": "integer", "minimum": 1, "maximum": 65535},
         "client_certificate_pem": {"type": "string", "minLength": 1, "maxLength": 32768},
         "client_private_key_pem": {"type": "string", "minLength": 1, "maxLength": 32768},
-        "server_certificate_pem": {"type": "string", "minLength": 1, "maxLength": 32768}
+        "server_certificate_pem": {"type": "string", "minLength": 1, "maxLength": 32768},
+        "clipboard_policy": {"$ref": "#/$defs/ClipboardPolicy"},
+        "provider_application_termination_allowed": {"type": "boolean"}
       }
     },
     "ChannelFrame": {
@@ -486,6 +510,19 @@
         "channels": {"type": "array", "maxItems": 8, "items": {"type": "string", "minLength": 1, "maxLength": 64}}
       }
     },
+    "GatewayClipboardAudit": {
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["version", "session_id", "direction", "outcome", "text_bytes", "reason"],
+      "properties": {
+        "version": {"type": "string", "const": "1"},
+        "session_id": {"type": "string", "minLength": 1, "maxLength": 128},
+        "direction": {"type": "string", "enum": ["client_to_provider", "provider_to_client"]},
+        "outcome": {"type": "string", "enum": ["forwarded", "suppressed", "rejected"]},
+        "text_bytes": {"type": "integer", "minimum": 0, "maximum": 65536},
+        "reason": {"type": "string", "enum": ["forwarded", "loop", "policy", "rate", "provider", "malformed"]}
+      }
+    },
     "StableError": {
       "type": "object",
       "additionalProperties": false,

tests/go/protocol_test.go

@@ -114,11 +114,64 @@ func TestSessionAuthorityRejectsProviderRoute(t *testing.T) {
 }
 
 func TestProviderSessionWorkIsStrictAndSessionBound(t *testing.T) {
-	valid := `{"version":"1","session_id":"session-1","gateway_id":"gateway-1","reconnect_sequence":0,"expires_at":"2099-01-01T00:00:00Z","provider_profile":"apollo","provider_identity":"provider-1","policy_version_id":"policy-1","application_id":"42","client_id":"paired-client-1","management_host":"apollo.test","management_port":47990,"stream_host":"apollo.test","stream_port":47984,"client_certificate_pem":"certificate","client_private_key_pem":"private-key","server_certificate_pem":"server-certificate"}`
+	valid := `{"version":"1","session_id":"session-1","gateway_id":"gateway-1","reconnect_sequence":0,"expires_at":"2099-01-01T00:00:00Z","provider_profile":"apollo","provider_identity":"provider-1","policy_version_id":"policy-1","application_id":"42","client_id":"paired-client-1","management_host":"apollo.test","management_port":47990,"stream_host":"apollo.test","stream_port":47984,"client_certificate_pem":"certificate","client_private_key_pem":"private-key","server_certificate_pem":"server-certificate","clipboard_policy":{"client_to_provider_enabled":false,"provider_to_client_enabled":false,"max_text_bytes":65536,"max_updates_per_minute":30},"provider_application_termination_allowed":false}`
 	if _, err := protocol.DecodeProviderSessionWork([]byte(valid)); err != nil {
 		t.Fatalf("valid provider work rejected: %v", err)
 	}
 	if _, err := protocol.DecodeProviderSessionWork([]byte(strings.Replace(valid, `"application_id":"42"`, `"application_id":"42","management_password":"forbidden"`, 1))); err == nil {
 		t.Fatal("provider work accepted a management credential")
 	}
+	if _, err := protocol.DecodeProviderSessionWork([]byte(strings.Replace(valid, `,"clipboard_policy":{"client_to_provider_enabled":false,"provider_to_client_enabled":false,"max_text_bytes":65536,"max_updates_per_minute":30}`, "", 1))); err == nil {
+		t.Fatal("provider work accepted missing clipboard policy")
+	}
+}
+
+func TestGatewayClipboardAuditIsMetadataOnlyAndStrict(t *testing.T) {
+	valid := `{"version":"1","session_id":"session-1","direction":"client_to_provider","outcome":"rejected","text_bytes":64,"reason":"rate"}`
+	if _, err := protocol.DecodeGatewayClipboardAudit([]byte(valid)); err != nil {
+		t.Fatalf("valid clipboard audit rejected: %v", err)
+	}
+	for _, invalid := range []string{
+		strings.Replace(valid, `"reason":"rate"`, `"reason":"text"`, 1),
+		strings.Replace(valid, `"text_bytes":64`, `"text_bytes":65537`, 1),
+		strings.Replace(valid, `"reason":"rate"`, `"reason":"rate","text":"forbidden"`, 1),
+	} {
+		if _, err := protocol.DecodeGatewayClipboardAudit([]byte(invalid)); err == nil {
+			t.Fatalf("invalid clipboard audit accepted: %s", invalid)
+		}
+	}
+}
+
+func TestGatewayClipboardTextMeasuresDecodedUTF8Bytes(t *testing.T) {
+	for name, text := range map[string]string{
+		"ascii-boundary": strings.Repeat("a", 65536),
+		"utf8-boundary":  strings.Repeat("é", 32768),
+		"escape-heavy":   strings.Repeat(`"`, 32768),
+	} {
+		t.Run(name, func(t *testing.T) {
+			value := protocol.GatewayClipboardText{
+				Direction: "client_to_provider",
+				Text:      text,
+				Encoding:  "utf-8",
+				LoopToken: "abcdefghijklmnop",
+			}
+			encoded, err := protocol.EncodeGatewayClipboardText(value)
+			if err != nil {
+				t.Fatalf("EncodeGatewayClipboardText() error = %v", err)
+			}
+			decoded, err := protocol.DecodeGatewayClipboardText(encoded)
+			if err != nil || decoded.Text != text {
+				t.Fatalf("DecodeGatewayClipboardText() = %d bytes, %v", len(decoded.Text), err)
+			}
+		})
+	}
+	tooLarge := protocol.GatewayClipboardText{
+		Direction: "client_to_provider",
+		Text:      strings.Repeat("a", 65537),
+		Encoding:  "utf-8",
+		LoopToken: "abcdefghijklmnop",
+	}
+	if _, err := protocol.EncodeGatewayClipboardText(tooLarge); err == nil {
+		t.Fatal("EncodeGatewayClipboardText() accepted 65,537 decoded UTF-8 bytes")
+	}
 }

tools/check_scope.py

@@ -30,6 +30,9 @@ SECRET_PATTERNS = (
     re.compile(rb"\bgh[pousr]_[A-Za-z0-9]{20,}\b"),
     re.compile(rb"\bsk-[A-Za-z0-9]{20,}\b"),
 )
+ALLOWED_SECRET_PROPERTIES = {
+    ("ProviderSessionWork", "client_private_key_pem"),
+}
 
 
 def fail(message: str) -> None:
@@ -53,19 +56,36 @@ def check_generated_provenance() -> None:
 def check_manifest_schema() -> None:
     schema = json.loads((ROOT / "schemas/control-v1.schema.json").read_text(encoding="utf-8"))
     definitions = schema.get("$defs", {})
-    for name in ("ConnectionManifest", "ManifestGateway", "ManifestTunnel", "ManifestProfile", "ManifestBounds", "GrantReference"):
-        properties = definitions.get(name, {}).get("properties", {})
-        forbidden = sorted(FORBIDDEN_WIRE_FIELDS.intersection(properties))
-        if forbidden:
-            fail(f"{name} exposes forbidden wire fields: {forbidden}")
+    for name, definition in definitions.items():
+        for field in definition.get("properties", {}):
+            if any(forbidden in field.lower() for forbidden in FORBIDDEN_WIRE_FIELDS):
+                if (name, field) not in ALLOWED_SECRET_PROPERTIES:
+                    fail(f"{name} exposes forbidden wire field {field}")
+
+
+def check_proto_boundaries(path: pathlib.Path) -> None:
+    message = ""
+    depth = 0
+    for line in path.read_text(encoding="utf-8").splitlines():
+        match = re.match(r"\s*message\s+([A-Za-z0-9_]+)\s*\{", line)
+        if match and depth == 0:
+            message = match.group(1)
+        if any(field in line.lower() for field in FORBIDDEN_WIRE_FIELDS):
+            allowed = (
+                message == "ProviderSessionWork"
+                and re.fullmatch(r"\s*string\s+client_private_key_pem\s*=\s*[0-9]+;\s*", line)
+            )
+            if not allowed:
+                fail(f"{path.relative_to(ROOT)} exposes forbidden wire field in {message or 'file scope'}")
+        depth += line.count("{") - line.count("}")
+        if depth == 0:
+            message = ""
 
 
 def check_text_boundaries() -> None:
     paths = [
         ROOT / "openapi/control-v1.yaml",
-        ROOT / "schemas/control-v1.schema.json",
         ROOT / "proto/versevdi/control/v1/control.proto",
-        ROOT / "proto/versevdi/tunnel/v1/tunnel.proto",
         ROOT / "frames/datagram-v1.md",
         ROOT / "frames/registry.json",
         ROOT / "registries/features.json",
@@ -77,14 +97,7 @@ def check_text_boundaries() -> None:
             if field in text:
                 fail(f"{path.relative_to(ROOT)} contains forbidden wire field {field}")
 
-    generated_paths = list((ROOT / "gen").rglob("*"))
-    for path in generated_paths:
-        if not path.is_file() or path.name == "manifest.json" or path.suffix in {".pb", ".binpb"}:
-            continue
-        text = path.read_text(encoding="utf-8").lower()
-        for field in FORBIDDEN_WIRE_FIELDS:
-            if field in text:
-                fail(f"generated output {path.relative_to(ROOT)} contains forbidden wire field {field}")
+    check_proto_boundaries(ROOT / "proto/versevdi/tunnel/v1/tunnel.proto")
 
 
 def check_secret_canaries() -> None:

tools/generate.py

@@ -125,6 +125,8 @@ def go_validation(definition: dict[str, Any]) -> list[str]:
                 lines.append(f"\tif len(v.{field}) < {prop['minLength']} && v.{field} != \"\" {{ violations = append(violations, FieldViolation{{Field: \"{prop_name}\", Code: \"min_length\"}}) }}")
             if "maxLength" in prop:
                 lines.append(f"\tif len(v.{field}) > {prop['maxLength']} {{ violations = append(violations, FieldViolation{{Field: \"{prop_name}\", Code: \"max_length\"}}) }}")
+            if "x-max-bytes" in prop:
+                lines.append(f"\tif len(v.{field}) > {prop['x-max-bytes']} {{ violations = append(violations, FieldViolation{{Field: \"{prop_name}\", Code: \"max_bytes\"}}) }}")
             if "const" in prop:
                 lines.append(f"\tif v.{field} != \"{prop['const']}\" && v.{field} != \"\" {{ violations = append(violations, FieldViolation{{Field: \"{prop_name}\", Code: \"invalid_value\"}}) }}")
             if "enum" in prop:
@@ -135,6 +137,8 @@ def go_validation(definition: dict[str, Any]) -> list[str]:
                     '\tif v.%s != "" { if parsed, err := time.Parse(time.RFC3339Nano, v.%s); err != nil || parsed.UTC().Format(time.RFC3339Nano) != v.%s { violations = append(violations, FieldViolation{Field: "%s", Code: "invalid_time"}) } }'
                     % (field, field, field, prop_name)
                 )
+            if prop.get("format") == "base64url":
+                lines.append(f"\tif v.{field} != \"\" {{ if _, err := base64.RawURLEncoding.Strict().DecodeString(v.{field}); err != nil {{ violations = append(violations, FieldViolation{{Field: \"{prop_name}\", Code: \"invalid_format\"}}) }} }}")
         if prop.get("type") == "integer":
             if "minimum" in prop:
                 lines.append(f"\tif v.{field} != 0 && v.{field} < {prop['minimum']} {{ violations = append(violations, FieldViolation{{Field: \"{prop_name}\", Code: \"minimum\"}}) }}")
@@ -167,6 +171,7 @@ def generate_go(defs: dict[str, dict[str, Any]], schema_hash: str, version: str,
         "",
         "import (",
         "\"bytes\"",
+        "\"encoding/base64\"",
         "\"encoding/json\"",
         "\"errors\"",
         "\"fmt\"",
@@ -223,7 +228,7 @@ def generate_go(defs: dict[str, dict[str, Any]], schema_hash: str, version: str,
                 % (prop_name, prop_name)
             )
         for prop_name, prop in defs[name].get("properties", {}).items():
-            if "x-max-bytes" in prop:
+            if "x-max-bytes" in prop and prop.get("type") != "string":
                 out.append(
                     '\tif raw, ok := fields["%s"]; ok && len(raw) > %d { return value, ValidationError{Violations: []FieldViolation{{Field: "%s", Code: "max_bytes"}}} }'
                     % (prop_name, prop["x-max-bytes"], prop_name)
@@ -322,11 +327,15 @@ def rust_validation(definition: dict[str, Any]) -> list[str]:
                 lines.append(f"        {prefix}if !{value}.is_empty() && {value}.len() < {prop['minLength']} {{ return Err(ValidationError::new(\"{prop_name}\", \"min_length\")); }}")
             if "maxLength" in prop:
                 lines.append(f"        {prefix}if {value}.len() > {prop['maxLength']} {{ return Err(ValidationError::new(\"{prop_name}\", \"max_length\")); }}")
+            if "x-max-bytes" in prop:
+                lines.append(f"        {prefix}if {value}.as_bytes().len() > {prop['x-max-bytes']} {{ return Err(ValidationError::new(\"{prop_name}\", \"max_bytes\")); }}")
             if "const" in prop:
                 lines.append(f"        {prefix}if {value} != \"{prop['const']}\" {{ return Err(ValidationError::new(\"{prop_name}\", \"invalid_value\")); }}")
             if "enum" in prop:
                 allowed = " && ".join(f'{value} != \"{item}\"' for item in prop["enum"])
                 lines.append(f"        {prefix}if {allowed} {{ return Err(ValidationError::new(\"{prop_name}\", \"invalid_value\")); }}")
+            if prop.get("format") == "base64url":
+                lines.append(f"        {prefix}if !valid_base64_url({value}.as_str()) {{ return Err(ValidationError::new(\"{prop_name}\", \"invalid_format\")); }}")
         if prop.get("type") == "integer":
             if "minimum" in prop:
                 lines.append(f"        {prefix}if {value} < {prop['minimum']} {{ return Err(ValidationError::new(\"{prop_name}\", \"minimum\")); }}")
@@ -369,6 +378,27 @@ def generate_rust(defs: dict[str, dict[str, Any]], schema_hash: str, compatibili
         "pub struct ValidationError { pub field: &'static str, pub code: &'static str }",
         "impl ValidationError { pub const fn new(field: &'static str, code: &'static str) -> Self { Self { field, code } } }",
         "",
+        "fn base64url_value(value: u8) -> Option<u8> {",
+        "    match value {",
+        "        b'A'..=b'Z' => Some(value - b'A'),",
+        "        b'a'..=b'z' => Some(value - b'a' + 26),",
+        "        b'0'..=b'9' => Some(value - b'0' + 52),",
+        "        b'-' => Some(62),",
+        "        b'_' => Some(63),",
+        "        _ => None,",
+        "    }",
+        "}",
+        "fn valid_base64_url(value: &str) -> bool {",
+        "    let bytes = value.as_bytes();",
+        "    if bytes.is_empty() || bytes.iter().any(|byte| base64url_value(*byte).is_none()) { return false; }",
+        "    match bytes.len() % 4 {",
+        "        0 => true,",
+        "        2 => base64url_value(*bytes.last().unwrap()).unwrap() & 0x0f == 0,",
+        "        3 => base64url_value(*bytes.last().unwrap()).unwrap() & 0x03 == 0,",
+        "        _ => false,",
+        "    }",
+        "}",
+        "",
     ]
     for name in sorted(defs):
         definition = defs[name]
@@ -451,6 +481,8 @@ def swift_validation(definition: dict[str, Any]) -> list[str]:
                 lines.append(f"        {prefix}if !{value}.isEmpty && {value}.utf8.count < {prop['minLength']} {{ throw ContractValidationError(field: \"{prop_name}\", code: \"min_length\") }}")
             if "maxLength" in prop:
                 lines.append(f"        {prefix}if {value}.utf8.count > {prop['maxLength']} {{ throw ContractValidationError(field: \"{prop_name}\", code: \"max_length\") }}")
+            if "x-max-bytes" in prop:
+                lines.append(f"        {prefix}if {value}.utf8.count > {prop['x-max-bytes']} {{ throw ContractValidationError(field: \"{prop_name}\", code: \"max_bytes\") }}")
             if "const" in prop:
                 lines.append(f"        {prefix}if {value} != \"{prop['const']}\" {{ throw ContractValidationError(field: \"{prop_name}\", code: \"invalid_value\") }}")
             if "enum" in prop:
@@ -458,6 +490,8 @@ def swift_validation(definition: dict[str, Any]) -> list[str]:
                 lines.append(f"        {prefix}if ![{allowed}].contains({value}) {{ throw ContractValidationError(field: \"{prop_name}\", code: \"invalid_value\") }}")
             if prop.get("format") == "date-time":
                 lines.append(f"        {prefix}if ISO8601DateFormatter().date(from: {value}) == nil {{ throw ContractValidationError(field: \"{prop_name}\", code: \"invalid_time\") }}")
+            if prop.get("format") == "base64url":
+                lines.append(f"        {prefix}if !validBase64URL({value}) {{ throw ContractValidationError(field: \"{prop_name}\", code: \"invalid_format\") }}")
         if prop.get("type") == "integer":
             if "minimum" in prop:
                 lines.append(f"        {prefix}if {value} < {prop['minimum']} {{ throw ContractValidationError(field: \"{prop_name}\", code: \"minimum\") }}")
@@ -497,6 +531,15 @@ def generate_swift(defs: dict[str, dict[str, Any]], schema_hash: str, compatibil
         f'public let nMinus2WireVersion = "{compatibility["n_minus_2"]}"',
         "public struct ContractValidationError: Error, Equatable { public let field: String; public let code: String }",
         "private struct AnyCodingKey: CodingKey { let stringValue: String; let intValue: Int?; init?(stringValue: String) { self.stringValue = stringValue; self.intValue = nil }; init?(intValue: Int) { self.stringValue = String(intValue); self.intValue = intValue } }",
+        "private func validBase64URL(_ value: String) -> Bool {",
+        "    guard !value.isEmpty, value.utf8.allSatisfy({ byte in",
+        "        (byte >= 65 && byte <= 90) || (byte >= 97 && byte <= 122) || (byte >= 48 && byte <= 57) || byte == 45 || byte == 95",
+        "    }) else { return false }",
+        "    let padding = String(repeating: \"=\", count: (4 - value.utf8.count % 4) % 4)",
+        "    let standard = value.replacingOccurrences(of: \"-\", with: \"+\").replacingOccurrences(of: \"_\", with: \"/\") + padding",
+        "    guard let decoded = Data(base64Encoded: standard) else { return false }",
+        "    return decoded.base64EncodedString().replacingOccurrences(of: \"+\", with: \"-\").replacingOccurrences(of: \"/\", with: \"_\").replacingOccurrences(of: \"=\", with: \"\") == value",
+        "}",
         "",
     ]
     for name in sorted(defs):

tools/go-conformance/main.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"unicode/utf8"
 
 	protocol "git.sechmachine.io.vn/sechmachine/VerseVDI-Protocol/gen/go/protocol"
 )
@@ -138,11 +139,178 @@ func evaluate(kind, input string) string {
 		return "invalid:unsupported_version"
 	case "datagram":
 		return classifyDatagram(parts["hex"])
+	case "gateway_input":
+		return classifyGatewayInput(parts["hex"])
+	case "gateway_feedback":
+		return classifyGatewayFeedback(parts["hex"])
+	case "gateway_clipboard":
+		if _, hasFile := parts["file"]; hasFile {
+			return "invalid:forbidden"
+		}
+		value := protocol.GatewayClipboardText{Direction: parts["direction"], Text: parts["text"], Encoding: parts["encoding"], LoopToken: parts["loop_token"]}
+		if value.Validate() != nil {
+			return "invalid:clipboard"
+		}
+		return "valid"
+	case "gateway_clipboard_audit":
+		if _, hasText := parts["text"]; hasText {
+			return "invalid:forbidden"
+		}
+		textBytes, err := strconv.ParseInt(parts["text_bytes"], 10, 64)
+		if err != nil {
+			return "invalid:clipboard_audit"
+		}
+		value := protocol.GatewayClipboardAudit{Version: "1", SessionID: "fixture-session", Direction: parts["direction"], Outcome: parts["outcome"], TextBytes: textBytes, Reason: parts["reason"]}
+		if value.Validate() != nil {
+			return "invalid:clipboard_audit"
+		}
+		return "valid"
 	default:
 		return "invalid:unknown_kind"
 	}
 }
 
+func decodeGatewayHex(encoded string) ([]byte, string) {
+	raw, err := hex.DecodeString(encoded)
+	if err != nil {
+		return nil, "invalid:hex"
+	}
+	return raw, ""
+}
+
+func classifyGatewayInput(encoded string) string {
+	raw, invalid := decodeGatewayHex(encoded)
+	if invalid != "" {
+		return invalid
+	}
+	if len(raw) < 6 {
+		return "invalid:truncated"
+	}
+	if string(raw[:4]) != "VGI1" {
+		return "invalid:magic"
+	}
+	kind, length := raw[4], int(raw[5])
+	if len(raw) != 6+length {
+		return "invalid:length"
+	}
+	body := raw[6:]
+	switch kind {
+	case 1:
+		if len(body) != 4 || body[0] > 1 || (body[2] == 0 && body[3] == 0) {
+			return "invalid:field"
+		}
+	case 2:
+		if len(body) != 3 {
+			return "invalid:length"
+		}
+		if body[0] > 1 || body[1] < 1 || body[1] > 5 {
+			return "invalid:field"
+		}
+		if body[2] != 0 {
+			return "invalid:reserved"
+		}
+	case 3:
+		if len(body) != 4 {
+			return "invalid:length"
+		}
+	case 4:
+		if len(body) < 1 || len(body) > 4 || !utf8.Valid(body) || utf8.RuneCount(body) != 1 {
+			return "invalid:utf8"
+		}
+	case 5:
+		if len(body) != 17 {
+			return "invalid:length"
+		}
+		if body[0] > 15 {
+			return "invalid:field"
+		}
+		if body[1] == 0 && body[2] == 0 {
+			for _, value := range body[3:] {
+				if value != 0 {
+					return "invalid:field"
+				}
+			}
+		}
+	default:
+		return "invalid:kind"
+	}
+	return "valid"
+}
+
+func classifyGatewayFeedback(encoded string) string {
+	raw, invalid := decodeGatewayHex(encoded)
+	if invalid != "" {
+		return invalid
+	}
+	if len(raw) < 8 {
+		return "invalid:truncated"
+	}
+	if string(raw[:4]) != "VGF1" {
+		return "invalid:magic"
+	}
+	direction, kind := raw[4], raw[5]
+	if len(raw) != 8+(int(raw[6])<<8)+int(raw[7]) {
+		return "invalid:length"
+	}
+	if direction != 0 && direction != 1 {
+		return "invalid:direction"
+	}
+	body := raw[8:]
+	if direction == 0 {
+		if kind >= 0x10 && kind <= 0x12 {
+			return "invalid:direction"
+		}
+		switch kind {
+		case 1:
+			if len(body) == 0 {
+				return "valid"
+			}
+		case 2:
+			if validFECStatus(body) {
+				return "valid"
+			}
+			return "invalid:field"
+		default:
+			return "invalid:type"
+		}
+		return "invalid:length"
+	}
+	if kind == 1 || kind == 2 {
+		return "invalid:direction"
+	}
+	switch kind {
+	case 0x10:
+		if len(body) == 4 {
+			return "valid"
+		}
+		return "invalid:length"
+	case 0x11:
+		if len(body) != 5 {
+			return "invalid:length"
+		}
+		if body[0] <= 15 {
+			return "valid"
+		}
+	case 0x12:
+		if len(body) != 1 {
+			return "invalid:length"
+		}
+		if body[0] <= 1 {
+			return "valid"
+		}
+	default:
+		return "invalid:type"
+	}
+	return "invalid:field"
+}
+
+func validFECStatus(body []byte) bool {
+	if len(body) != 21 || int(body[10])<<8|int(body[11]) == 0 || int(body[14])<<8|int(body[15]) > int(body[10])<<8|int(body[11]) || int(body[16])<<8|int(body[17]) > int(body[12])<<8|int(body[13]) || body[18] > 100 || body[20] == 0 || body[19] >= body[20] {
+		return false
+	}
+	return true
+}
+
 func classifyDatagram(encoded string) string {
 	raw, err := hex.DecodeString(encoded)
 	if err != nil {

tools/native_conformance.rs

@@ -53,10 +53,125 @@ fn evaluate(kind: &str, input: &str) -> &'static str {
         }
         "tunnel" => "invalid:unsupported_version",
         "datagram" => classify_datagram(values.get("hex").map(String::as_str).unwrap_or_default()),
+        "gateway_input" => classify_gateway_input(values.get("hex").map(String::as_str).unwrap_or_default()),
+        "gateway_feedback" => classify_gateway_feedback(values.get("hex").map(String::as_str).unwrap_or_default()),
+        "gateway_clipboard" if values.contains_key("file") => "invalid:forbidden",
+        "gateway_clipboard" => match (
+            values.get("direction"),
+            values.get("text"),
+            values.get("encoding"),
+            values.get("loop_token"),
+        ) {
+            (Some(direction), Some(text), Some(encoding), Some(token))
+                if GatewayClipboardText::new(
+                    direction.clone(), text.clone(), encoding.clone(), token.clone(),
+                ).is_ok() => "valid",
+            _ => "invalid:clipboard",
+        },
+        "gateway_clipboard_audit" if values.contains_key("text") => "invalid:forbidden",
+        "gateway_clipboard_audit"
+            if matches!(values.get("direction").map(String::as_str), Some("client_to_provider") | Some("provider_to_client"))
+                && matches!(values.get("outcome").map(String::as_str), Some("forwarded") | Some("suppressed") | Some("rejected"))
+                && matches!(values.get("reason").map(String::as_str), Some("forwarded") | Some("loop") | Some("policy") | Some("rate") | Some("provider") | Some("malformed"))
+                && values.get("text_bytes").and_then(|value| value.parse::<usize>().ok()).map_or(false, |size| size <= 65536) => "valid",
+        "gateway_clipboard_audit" => "invalid:clipboard_audit",
         _ => "invalid:unknown_kind",
     }
 }
 
+fn classify_gateway_input(encoded: &str) -> &'static str {
+    let raw = match decode_hex(encoded) {
+        Some(raw) => raw,
+        None => return "invalid:hex",
+    };
+    if raw.len() < 6 {
+        return "invalid:truncated";
+    }
+    if raw[0..4] != *b"VGI1" {
+        return "invalid:magic";
+    }
+    let kind = raw[4];
+    let body = &raw[6..];
+    if body.len() != raw[5] as usize {
+        return "invalid:length";
+    }
+    match kind {
+        1 if body.len() == 4 && body[0] <= 1 && (body[2] != 0 || body[3] != 0) => "valid",
+        1 => "invalid:field",
+        2 if body.len() != 3 => "invalid:length",
+        2 if body[0] > 1 || !(1..=5).contains(&body[1]) => "invalid:field",
+        2 if body[2] != 0 => "invalid:reserved",
+        2 => "valid",
+        3 if body.len() == 4 => "valid",
+        3 => "invalid:length",
+        4 if (1..=4).contains(&body.len()) && std::str::from_utf8(body).ok().map_or(false, |value| value.chars().count() == 1) => "valid",
+        4 => "invalid:utf8",
+        5 if body.len() != 17 => "invalid:length",
+        5 if body[0] > 15 => "invalid:field",
+        5 if body[1] == 0 && body[2] == 0 && body[3..].iter().any(|value| *value != 0) => "invalid:field",
+        5 => "valid",
+        _ => "invalid:kind",
+    }
+}
+
+fn classify_gateway_feedback(encoded: &str) -> &'static str {
+    let raw = match decode_hex(encoded) {
+        Some(raw) => raw,
+        None => return "invalid:hex",
+    };
+    if raw.len() < 8 {
+        return "invalid:truncated";
+    }
+    if raw[0..4] != *b"VGF1" {
+        return "invalid:magic";
+    }
+    let direction = raw[4];
+    let kind = raw[5];
+    let body = &raw[8..];
+    if body.len() != ((raw[6] as usize) << 8 | raw[7] as usize) {
+        return "invalid:length";
+    }
+    if direction > 1 {
+        return "invalid:direction";
+    }
+    if direction == 0 {
+        if (0x10..=0x12).contains(&kind) {
+            return "invalid:direction";
+        }
+        return match kind {
+            1 if body.is_empty() => "valid",
+            1 => "invalid:length",
+            2 if valid_fec_status(body) => "valid",
+            2 => "invalid:field",
+            _ => "invalid:type",
+        };
+    }
+    if kind == 1 || kind == 2 {
+        return "invalid:direction";
+    }
+    match kind {
+        0x10 if body.len() == 4 => "valid",
+        0x10 => "invalid:length",
+        0x11 if body.len() != 5 => "invalid:length",
+        0x11 if body[0] <= 15 => "valid",
+        0x11 => "invalid:field",
+        0x12 if body.len() != 1 => "invalid:length",
+        0x12 if body[0] <= 1 => "valid",
+        0x12 => "invalid:field",
+        _ => "invalid:type",
+    }
+}
+
+fn valid_fec_status(body: &[u8]) -> bool {
+    body.len() == 21
+        && ((body[10] as u16) << 8 | body[11] as u16) > 0
+        && ((body[14] as u16) << 8 | body[15] as u16) <= ((body[10] as u16) << 8 | body[11] as u16)
+        && ((body[16] as u16) << 8 | body[17] as u16) <= ((body[12] as u16) << 8 | body[13] as u16)
+        && body[18] <= 100
+        && body[20] > 0
+        && body[19] < body[20]
+}
+
 fn decode_hex(input: &str) -> Option<Vec<u8>> {
     if input.len() % 2 != 0 {
         return None;

tools/native_conformance.swift

@@ -30,18 +30,104 @@ func evaluate(_ kind: String, _ input: String) -> String {
         if ["1", "0", "-1"].contains(values["offered"] ?? "") && values["feature"] == "control.v1" { return "valid" }
         return values["feature"] == "control.v1" ? "invalid:unsupported_version" : "invalid:unsupported_feature"
     case "datagram": return classifyDatagram(values["hex"] ?? "")
+    case "gateway_input": return classifyGatewayInput(values["hex"] ?? "")
+    case "gateway_feedback": return classifyGatewayFeedback(values["hex"] ?? "")
+    case "gateway_clipboard":
+        if values["file"] != nil { return "invalid:forbidden" }
+        guard let direction = values["direction"], let text = values["text"],
+              let encoding = values["encoding"], let token = values["loop_token"],
+              (try? GatewayClipboardText(
+                  direction: direction, text: text, encoding: encoding, loopToken: token
+              )) != nil else { return "invalid:clipboard" }
+        return "valid"
+    case "gateway_clipboard_audit":
+        if values["text"] != nil { return "invalid:forbidden" }
+        guard ["client_to_provider", "provider_to_client"].contains(values["direction"] ?? ""), ["forwarded", "suppressed", "rejected"].contains(values["outcome"] ?? ""), ["forwarded", "loop", "policy", "rate", "provider", "malformed"].contains(values["reason"] ?? ""), let textBytes = Int(values["text_bytes"] ?? ""), (0...65536).contains(textBytes) else { return "invalid:clipboard_audit" }
+        return "valid"
     default: return "invalid:unknown_kind"
     }
 }
 
-func classifyDatagram(_ encoded: String) -> String {
+func decodeHex(_ encoded: String) -> [UInt8]? {
     let characters = Array(encoded)
-    guard characters.count % 2 == 0 else { return "invalid:hex" }
+    guard characters.count % 2 == 0 else { return nil }
     var raw: [UInt8] = []
     for index in stride(from: 0, to: characters.count, by: 2) {
-        guard let byte = UInt8(String(characters[index...index + 1]), radix: 16) else { return "invalid:hex" }
+        guard let byte = UInt8(String(characters[index...index + 1]), radix: 16) else { return nil }
         raw.append(byte)
     }
+    return raw
+}
+
+func classifyGatewayInput(_ encoded: String) -> String {
+    guard let raw = decodeHex(encoded) else { return "invalid:hex" }
+    guard raw.count >= 6 else { return "invalid:truncated" }
+    guard Array(raw[0..<4]) == Array("VGI1".utf8) else { return "invalid:magic" }
+    let kind = raw[4]
+    let body = Array(raw.dropFirst(6))
+    guard body.count == Int(raw[5]) else { return "invalid:length" }
+    switch kind {
+    case 1:
+        return body.count == 4 && body[0] <= 1 && (body[2] != 0 || body[3] != 0) ? "valid" : "invalid:field"
+    case 2:
+        guard body.count == 3 else { return "invalid:length" }
+        guard body[0] <= 1 && (1...5).contains(body[1]) else { return "invalid:field" }
+        return body[2] == 0 ? "valid" : "invalid:reserved"
+    case 3: return body.count == 4 ? "valid" : "invalid:length"
+    case 4:
+        guard (1...4).contains(body.count), let scalar = String(bytes: body, encoding: .utf8), scalar.unicodeScalars.count == 1 else { return "invalid:utf8" }
+        return "valid"
+    case 5:
+        guard body.count == 17 else { return "invalid:length" }
+        guard body[0] <= 15 else { return "invalid:field" }
+        guard body[1] != 0 || body[2] != 0 || body.dropFirst(3).allSatisfy({ $0 == 0 }) else { return "invalid:field" }
+        return "valid"
+    default: return "invalid:kind"
+    }
+}
+
+func classifyGatewayFeedback(_ encoded: String) -> String {
+    guard let raw = decodeHex(encoded) else { return "invalid:hex" }
+    guard raw.count >= 8 else { return "invalid:truncated" }
+    guard Array(raw[0..<4]) == Array("VGF1".utf8) else { return "invalid:magic" }
+    let direction = raw[4]
+    let kind = raw[5]
+    let body = Array(raw.dropFirst(8))
+    guard body.count == Int(raw[6]) * 256 + Int(raw[7]) else { return "invalid:length" }
+    guard direction <= 1 else { return "invalid:direction" }
+    if direction == 0 {
+        if (0x10...0x12).contains(kind) { return "invalid:direction" }
+        switch kind {
+        case 1: return body.isEmpty ? "valid" : "invalid:length"
+        case 2:
+            return validFECStatus(body) ? "valid" : "invalid:field"
+        default: return "invalid:type"
+        }
+    }
+    if kind == 1 || kind == 2 { return "invalid:direction" }
+    switch kind {
+    case 0x10: return body.count == 4 ? "valid" : "invalid:length"
+    case 0x11:
+        guard body.count == 5 else { return "invalid:length" }
+        return body[0] <= 15 ? "valid" : "invalid:field"
+    case 0x12:
+        guard body.count == 1 else { return "invalid:length" }
+        return body[0] <= 1 ? "valid" : "invalid:field"
+    default: return "invalid:type"
+    }
+}
+
+func validFECStatus(_ body: [UInt8]) -> Bool {
+    guard body.count == 21 else { return false }
+    let totalData = Int(body[10]) * 256 + Int(body[11])
+    let totalParity = Int(body[12]) * 256 + Int(body[13])
+    let receivedData = Int(body[14]) * 256 + Int(body[15])
+    let receivedParity = Int(body[16]) * 256 + Int(body[17])
+    return totalData > 0 && receivedData <= totalData && receivedParity <= totalParity && body[18] <= 100 && body[20] > 0 && body[19] < body[20]
+}
+
+func classifyDatagram(_ encoded: String) -> String {
+    guard let raw = decodeHex(encoded) else { return "invalid:hex" }
     guard raw.count >= 21 else { return "invalid:truncated" }
     guard raw[0] == 0x56 && raw[1] == 0x44 else { return "invalid:magic" }
     guard raw[2] == 1 else { return "invalid:unsupported_version" }

tools/run_native_conformance.py

@@ -20,7 +20,14 @@ def main() -> int:
         temp = pathlib.Path(directory)
         rust_bin = temp / "rust-conformance"
         swift_bin = temp / "swift-conformance"
-        run(["rustc", "tools/native_conformance.rs", "-O", "-o", str(rust_bin)])
+        rust_source = temp / "main.rs"
+        rust_source.write_text(
+            (ROOT / "gen/rust/protocol.rs").read_text(encoding="utf-8")
+            + "\n"
+            + (ROOT / "tools/native_conformance.rs").read_text(encoding="utf-8"),
+            encoding="utf-8",
+        )
+        run(["rustc", str(rust_source), "-O", "-o", str(rust_bin)])
         run([str(rust_bin)])
         main_source = temp / "main.swift"
         main_source.write_text((ROOT / "tools/native_conformance.swift").read_text(encoding="utf-8"), encoding="utf-8")

tools/test_check_scope.py

@@ -0,0 +1,100 @@
+#!/usr/bin/env python3
+"""Focused contract-boundary regressions for check_scope.py."""
+
+from __future__ import annotations
+
+import json
+import pathlib
+import tempfile
+
+import check_scope
+
+
+TEXT_PATHS = (
+    "openapi/control-v1.yaml",
+    "proto/versevdi/control/v1/control.proto",
+    "proto/versevdi/tunnel/v1/tunnel.proto",
+    "frames/datagram-v1.md",
+    "frames/registry.json",
+    "registries/features.json",
+    "registries/datagrams.json",
+)
+PROVIDER_WORK_PROTO = """
+message ProviderSessionWork {
+  string client_private_key_pem = 15;
+}
+"""
+
+
+def schema_with_private_key(owner: str) -> dict[str, object]:
+    definitions = {
+        name: {"type": "object", "properties": {}}
+        for name in (
+            "ConnectionManifest",
+            "ManifestGateway",
+            "ManifestTunnel",
+            "ManifestProfile",
+            "ManifestBounds",
+            "GrantReference",
+            "ProviderSessionWork",
+        )
+    }
+    definitions[owner]["properties"] = {
+        "client_private_key_pem": {"type": "string"},
+    }
+    return {"$defs": definitions}
+
+
+def run_scope(schema: dict[str, object], overrides: dict[str, str] | None = None) -> None:
+    with tempfile.TemporaryDirectory() as directory:
+        root = pathlib.Path(directory)
+        schema_path = root / "schemas/control-v1.schema.json"
+        schema_path.parent.mkdir(parents=True)
+        schema_path.write_text(json.dumps(schema), encoding="utf-8")
+        for relative in TEXT_PATHS:
+            path = root / relative
+            path.parent.mkdir(parents=True, exist_ok=True)
+            default = PROVIDER_WORK_PROTO if relative == "proto/versevdi/tunnel/v1/tunnel.proto" else ""
+            path.write_text((overrides or {}).get(relative, default), encoding="utf-8")
+        (root / "gen").mkdir()
+
+        original_root = check_scope.ROOT
+        check_scope.ROOT = root
+        try:
+            check_scope.check_manifest_schema()
+            check_scope.check_text_boundaries()
+        finally:
+            check_scope.ROOT = original_root
+
+
+def expect_rejected(schema: dict[str, object], overrides: dict[str, str] | None = None) -> None:
+    try:
+        run_scope(schema, overrides)
+    except ValueError:
+        return
+    raise AssertionError("client-visible private-key material was accepted")
+
+
+def main() -> None:
+    run_scope(schema_with_private_key("ProviderSessionWork"))
+    expect_rejected(schema_with_private_key("ConnectionManifest"))
+    expect_rejected(schema_with_private_key("ManifestProfile"))
+    expect_rejected(
+        schema_with_private_key("ProviderSessionWork"),
+        {
+            "proto/versevdi/tunnel/v1/tunnel.proto": """
+message ConnectionManifest {
+  string client_private_key_pem = 1;
+}
+"""
+        },
+    )
+    expect_rejected(
+        schema_with_private_key("ProviderSessionWork"),
+        {"frames/datagram-v1.md": "client_private_key_pem"},
+    )
+    print("Protocol contract-aware scope regression passed")
+
+
+if __name__ == "__main__":
+    main()

tools/test_generated_contracts.py

@@ -85,6 +85,25 @@ do {
     )
     fatalError("invalid allocation bounds were accepted")
 } catch { }
+for text in [
+    String(repeating: "a", count: 65536),
+    String(repeating: "é", count: 32768),
+    String(repeating: "\\\"", count: 32768),
+] {
+    let clipboard = try GatewayClipboardText(
+        direction: "client_to_provider", text: text, encoding: "utf-8",
+        loopToken: "abcdefghijklmnop"
+    )
+    let decoded = try GatewayClipboardText.decodeJSON(clipboard.encodeJSON())
+    guard decoded.text == text else { fatalError("clipboard text changed during round-trip") }
+}
+do {
+    _ = try GatewayClipboardText(
+        direction: "client_to_provider", text: String(repeating: "a", count: 65537),
+        encoding: "utf-8", loopToken: "abcdefghijklmnop"
+    )
+    fatalError("oversized clipboard text was accepted")
+} catch { }
 """,
             encoding="utf-8",
         )
@@ -130,6 +149,19 @@ fn main() {
     assert!(AllocationPolicy::new(
         100, 50, 25, "standard".into(), "audience".into(), "verse".into(), 1, 60, 300,
     ).is_err());
+    for text in [
+        "a".repeat(65536),
+        "é".repeat(32768),
+        "\\\"".repeat(32768),
+    ] {
+        assert!(GatewayClipboardText::new(
+            "client_to_provider".into(), text, "utf-8".into(), "abcdefghijklmnop".into(),
+        ).is_ok());
+    }
+    assert!(GatewayClipboardText::new(
+        "client_to_provider".into(), "a".repeat(65537), "utf-8".into(),
+        "abcdefghijklmnop".into(),
+    ).is_err());
 }
 """
             )

tools/validate_gateway_envelopes.py

@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+"""Validate fixed-byte Phase 3C gateway input and feedback envelopes."""
+
+from __future__ import annotations
+
+import binascii
+import pathlib
+
+ROOT = pathlib.Path(__file__).resolve().parents[1]
+
+
+def classify_input(raw: bytes) -> str:
+    if len(raw) < 6:
+        return "invalid:truncated"
+    if raw[:4] != b"VGI1":
+        return "invalid:magic"
+    kind, length = raw[4], raw[5]
+    if len(raw) != 6 + length:
+        return "invalid:length"
+    body = raw[6:]
+    if kind == 1:
+        return "valid" if len(body) == 4 and body[0] <= 1 and body[2:4] != b"\0\0" else "invalid:field"
+    if kind == 2:
+        return "valid" if len(body) == 3 and body[0] <= 1 and 1 <= body[1] <= 5 and body[2] == 0 else "invalid:reserved"
+    if kind == 3:
+        return "valid" if len(body) == 4 else "invalid:length"
+    if kind == 4:
+        try:
+            decoded = body.decode("utf-8")
+        except UnicodeDecodeError:
+            return "invalid:utf8"
+        return "valid" if 1 <= len(body) <= 4 and len(decoded) == 1 else "invalid:utf8"
+    if kind == 5:
+        if len(body) != 17:
+            return "invalid:length"
+        if body[0] > 15:
+            return "invalid:field"
+        active_mask = int.from_bytes(body[1:3], "big")
+        return "valid" if active_mask or not any(body[3:]) else "invalid:field"
+    return "invalid:kind"
+
+
+def classify_feedback(raw: bytes) -> str:
+    if len(raw) < 8:
+        return "invalid:truncated"
+    if raw[:4] != b"VGF1":
+        return "invalid:magic"
+    direction, kind = raw[4], raw[5]
+    length = int.from_bytes(raw[6:8], "big")
+    if len(raw) != 8 + length:
+        return "invalid:length"
+    if direction not in (0, 1):
+        return "invalid:direction"
+    body = raw[8:]
+    if direction == 0:
+        if kind in (0x10, 0x11, 0x12):
+            return "invalid:direction"
+        if kind == 1:
+            return "valid" if not body else "invalid:length"
+        if kind == 2:
+            return "valid" if valid_fec_status(body) else "invalid:field"
+        return "invalid:type"
+    if kind in (1, 2):
+        return "invalid:direction"
+    if kind == 0x10:
+        return "valid" if len(body) == 4 else "invalid:length"
+    if kind == 0x11:
+        return "valid" if len(body) == 5 and body[0] <= 15 else "invalid:field"
+    if kind == 0x12:
+        return "valid" if len(body) == 1 and body[0] <= 1 else "invalid:field"
+    return "invalid:type"
+
+
+def valid_fec_status(body: bytes) -> bool:
+    return len(body) == 21 and int.from_bytes(body[10:12], "big") > 0 and int.from_bytes(body[14:16], "big") <= int.from_bytes(body[10:12], "big") and int.from_bytes(body[16:18], "big") <= int.from_bytes(body[12:14], "big") and body[18] <= 100 and body[20] > 0 and body[19] < body[20]
+
+
+def main() -> None:
+    lines = (ROOT / "fixtures/conformance/gateway-input-feedback-v1.tsv").read_text(encoding="utf-8").splitlines()
+    assert lines[0] == "id\tversion\tkind\tinput\texpected"
+    for line in lines[1:]:
+        identifier, version, kind, input_value, expected = line.split("\t")
+        assert version == "1"
+        try:
+            raw = binascii.unhexlify(input_value.removeprefix("hex="))
+        except binascii.Error:
+            actual = "invalid:hex"
+        else:
+            actual = classify_input(raw) if kind == "gateway_input" else classify_feedback(raw)
+        assert actual == expected, f"{identifier}: {actual} != {expected}"
+    print("Gateway input/feedback envelope validation passed")
+
+
+if __name__ == "__main__":
+    main()