[acp-release-bot]

🤖 New release

• agent-client-protocol-schema: 1.13.0 -> 1.14.0 (✓ API compatible changes)
• agent-client-protocol-json-schema-v1: 1.27.0 -> 1.28.0
• agent-client-protocol-json-schema-v2: 2.0.0-alpha.10 -> 2.0.0-alpha.11

Changelog

agent-client-protocol-schema

1.14.0 - 2026-10-30

Added

• (unstable-v2) remove JSON-RPC batching from v2 (#2625)
• (unstable-v2) add schema types for defined error data (#2605)
• (unstable-v2) accept other JSON values in elicitation content (#2595)
• (unstable) report subagent working directories (#2593)

Fixed

• (unstable-v2) encode the at-least-one-value rule for select options (#2662)
• (unstable-v2) match MCP's ISO 8601 lastModified (#2661)
• (unstable) use AbsolutePath for subagent cwd and additionalDirectories (#2660)
• (unstable-v2) require type and properties on elicitation requestedSchema (#2645)
• (unstable-v2) allow null error response ids in the generated schema (#2634)
• (schema) allow non-ISO currency units such as credits (#2621)
• (unstable-v2) make usage_update cost a patch field (#2617)
• (schema) mark SessionInfo.additionalDirectories as default-on-null (#2571)

Other

• (schema) adopt MCP's icon fetch rules (#2728)
• (schema) reject duplicate stdio env names (#2693)
• (schema) align max_turn_requests wording with the docs (#2717)
• (schema) Clients ignore config options of unknown type (#2712)
• (schema) auth methods trigger is a non-empty authMethods list (#2710)
• (schema) initialize can be repeated before other requests (#2711)
• (schema) an unknown plan type still replaces the plan (#2703)
• (schema) resource links are readable by the receiver (#2706)
• (schema) define annotation semantics (#2704)
• (schema) _meta docs forbid assigning meaning to unrecognized keys (#2701)
• (schema) document omission rules for setup-response configOptions (#2696)
• (schema) MCP transport headers take precedence over Client headers (#2694)
• (schema) cancel_request names a request its sender issued (#2687)
• (schema) align the session/close schema doc with the spec (#2682)
• (schema) an empty-string session/list cursor is valid (#2673)
• (schema) ignore cancel_request for unknown or answered requests (#2672)
• (unstable) clean up the SystemPrompt.mode description (#2668)
• (schema) new entities start at protocol defaults, not Client defaults (#2652)
• (schema) git_patch paths match changes, including on Windows (#2650)
• (schema) align close's prompt rule and call pending prompts held (#2648)
• (schema) Clients must not send an empty prompt (#2647)
• (schema) require a boundary after a command name (#2646)
• (schema) require session/resume cwd to match the session (#2640)
• (schema) SessionInfo.additionalDirectories doesn't allow null (#2638)
• (schema) allow a normal response after $/cancel_request (#2636)
• (unstable-v2) scope end-turn Usage fields to the completed work (#2630)
• (schema) define AbsolutePath syntax and reject relative cwd (#2629)
• (schema) state request ID rules for a bidirectional connection (#2622)
• (schema) drop the v1 exclusion note from the v2 refusal stop reason (#2619)
• (schema) resume mcpServers is the complete Client-provided set (#2614)
• (schema) require session/resume cwd to match the session (#2612)
• (schema) define session/list cwd matching (#2609)
• (schema) specify slash command names and invocation (#2598)
• (schema) clarify authMethods obligations, terminal gating and auth/login errors (#2589)
• (schema) define declining a permission request and unknown option IDs (#2582)
• (schema) let cancelled cover stops the user chose through the Agent (#2576)

agent-client-protocol-json-schema-v1

1.28.0 - 2026-10-30

Added

• (unstable) report subagent working directories (#2593)

Fixed

• (schema) allow non-ISO currency units such as credits (#2621)

agent-client-protocol-json-schema-v2

2.0.0-alpha.11 - 2026-10-30

Added

• (unstable-v2) remove JSON-RPC batching from v2 (#2625)
• (unstable-v2) add schema types for defined error data (#2605)
• (unstable-v2) accept other JSON values in elicitation content (#2595)
• (unstable) report subagent working directories (#2593)

Fixed

• (unstable-v2) encode the at-least-one-value rule for select options (#2662)
• (unstable-v2) match MCP's ISO 8601 lastModified (#2661)
• (unstable) use AbsolutePath for subagent cwd and additionalDirectories (#2660)
• (unstable-v2) require type and properties on elicitation requestedSchema (#2645)
• (unstable-v2) allow null error response ids in the generated schema (#2634)
• (schema) allow non-ISO currency units such as credits (#2621)
• (unstable-v2) make usage_update cost a patch field (#2617)
• (schema) mark SessionInfo.additionalDirectories as default-on-null (#2571)

Other

• (schema) adopt MCP's icon fetch rules (#2728)
• (schema) reject duplicate stdio env names (#2693)
• (schema) align max_turn_requests wording with the docs (#2717)
• (schema) Clients ignore config options of unknown type (#2712)
• (schema) auth methods trigger is a non-empty authMethods list (#2710)
• (schema) initialize can be repeated before other requests (#2711)
• (schema) an unknown plan type still replaces the plan (#2703)
• (schema) resource links are readable by the receiver (#2706)
• (schema) define annotation semantics (#2704)
• (schema) _meta docs forbid assigning meaning to unrecognized keys (#2701)
• (schema) document omission rules for setup-response configOptions (#2696)
• (schema) MCP transport headers take precedence over Client headers (#2694)
• (schema) cancel_request names a request its sender issued (#2687)
• (schema) align the session/close schema doc with the spec (#2682)
• (schema) an empty-string session/list cursor is valid (#2673)
• (schema) ignore cancel_request for unknown or answered requests (#2672)
• (unstable) clean up the SystemPrompt.mode description (#2668)
• (schema) new entities start at protocol defaults, not Client defaults (#2652)
• (schema) git_patch paths match changes, including on Windows (#2650)
• (schema) align close's prompt rule and call pending prompts held (#2648)
• (schema) Clients must not send an empty prompt (#2647)
• (schema) require a boundary after a command name (#2646)
• (schema) require session/resume cwd to match the session (#2640)
• (schema) SessionInfo.additionalDirectories doesn't allow null (#2638)
• (schema) allow a normal response after $/cancel_request (#2636)
• (unstable-v2) scope end-turn Usage fields to the completed work (#2630)
• (schema) define AbsolutePath syntax and reject relative cwd (#2629)
• (schema) state request ID rules for a bidirectional connection (#2622)
• (schema) drop the v1 exclusion note from the v2 refusal stop reason (#2619)
• (schema) resume mcpServers is the complete Client-provided set (#2614)
• (schema) require session/resume cwd to match the session (#2612)
• (schema) define session/list cwd matching (#2609)
• (schema) specify slash command names and invocation (#2598)
• (schema) clarify authMethods obligations, terminal gating and auth/login errors (#2589)
• (schema) define declining a permission request and unknown option IDs (#2582)
• (schema) let cancelled cover stops the user chose through the Agent (#2576)

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