[acp-release-bot]

🤖 New release

• agent-client-protocol-schema: 1.12.0 -> 1.13.0 (✓ API compatible changes)
• agent-client-protocol-json-schema-v1: 1.26.0 -> 1.27.0
• agent-client-protocol-json-schema-v2: 2.0.0-alpha.9 -> 2.0.0-alpha.10

Changelog

agent-client-protocol-schema

1.13.0 - 2026-10-27

Added

• (unstable-v2) add optional terminal size to terminal_update (#2550)
• (unstable-v2) make ResourceLink.size unsigned and define unknown tool kinds (#2521)
• (unstable-v2) add _meta to DiffPatch, ToolCallPermissionSubject, Icon and the cancelled outcome (#2517)
• (unstable-v2) disallow null request IDs (#2499)
• (unstable-v2) add type discriminator to available commands (#2494)
• (unstable) link session message views and keep identity off chunks (#2465)
• (unstable-v2) define version mismatch errors (#2412)

Fixed

• (unstable-v2) parse nextCursor and listed session directories strictly (#2567)
• (unstable-v2) don't clear replacement lists on a malformed value (#2568)
• (unstable-v2) keep optional fields of unknown variants verbatim (#2561)
• (unstable-v2) reject a non-object elicitation schema root type (#2558)
• (unstable) null clears session_message participant IDs and message references (#2555)
• (unstable-v2) make ToolCallLocation.line 1-based (#2546)
• (unstable-v2) make terminal exitCode a signed integer (#2545)
• (schema) require exactly one elicitation scope in v2 (#2498)

Other

• (schema) state null handling for every optional v2 field (#2570)
• (schema) mark DefaultOnNull lists with an x-deserialize hint (#2569)
• (schema) fix broken v2 doc anchors (#2565)
• (schema) put the text-content Markdown rule on the content page (#2562)
• (schema) use one description for every v2 _meta field (#2560)
• (schema) define config option defaults via currentValue and state select invariants (#2557)
• (schema) document the elicitation form-schema subset and unrenderable forms (#2556)
• (schema) say permission tool_call subjects apply as tool_call_update upserts (#2554)
• (schema) specify v2 diff baseline, path uniqueness and patch conflicts (#2547)
• (schema) define tool call field defaults and null resets in v2 (#2544)
• (schema) define switch_mode as changing the mode config option in v2 (#2543)
• (schema) note that titled multi-select items omit type, as in MCP (#2538)
• (schema) ExtNotification can be sent by either side (#2534)
• (schema) include -32800's range in the reserved error codes (#2531)
• (schema) write versioned doc links in source and drop the generator's link rewriting (#2525)
• (schema) define which stop reason applies to v2 cancellations (#2523)
• (schema) mark required v2 fields in the docs and rename ClientAuthCapabilities (#2522)
• (schema) use wire names instead of Rust identifiers in schema descriptions (#2520)
• (schema) define Client handling of unknown v2 session states and tool statuses (#2510)
• (schema) define timeline placement for v2 entities (#2509)
• (schema) define session/cancel as cancelling foreground work in v2 (#2508)
• (schema) write the error pages for v1 and v2 (#2504)
• (schema) define receiver behavior for unknown v2 variants (#2500)
• (schema) define when session/set_config_option is available in v2 (#2497)

agent-client-protocol-json-schema-v1

1.27.0 - 2026-10-27

Added

• (unstable) link session message views and keep identity off chunks (#2465)

Fixed

• (unstable) null clears session_message participant IDs and message references (#2555)
• (unstable-v2) make ToolCallLocation.line 1-based (#2546)

Other

• (schema) mark DefaultOnNull lists with an x-deserialize hint (#2569)
• (schema) note that titled multi-select items omit type, as in MCP (#2538)
• (schema) ExtNotification can be sent by either side (#2534)
• (schema) include -32800's range in the reserved error codes (#2531)
• (schema) write versioned doc links in source and drop the generator's link rewriting (#2525)
• (schema) use wire names instead of Rust identifiers in schema descriptions (#2520)
• (schema) write the error pages for v1 and v2 (#2504)
• (deps) bump the minor group with 9 updates (#2437)

agent-client-protocol-json-schema-v2

2.0.0-alpha.10 - 2026-10-27

Added

• (unstable-v2) add optional terminal size to terminal_update (#2550)
• (unstable-v2) make ResourceLink.size unsigned and define unknown tool kinds (#2521)
• (unstable-v2) add _meta to DiffPatch, ToolCallPermissionSubject, Icon and the cancelled outcome (#2517)
• (unstable-v2) disallow null request IDs (#2499)
• (unstable-v2) add type discriminator to available commands (#2494)
• (unstable) link session message views and keep identity off chunks (#2465)
• (unstable-v2) define version mismatch errors (#2412)

Fixed

• (unstable-v2) parse nextCursor and listed session directories strictly (#2567)
• (unstable-v2) don't clear replacement lists on a malformed value (#2568)
• (unstable-v2) keep optional fields of unknown variants verbatim (#2561)
• (unstable-v2) reject a non-object elicitation schema root type (#2558)
• (unstable) null clears session_message participant IDs and message references (#2555)
• (unstable-v2) make ToolCallLocation.line 1-based (#2546)
• (unstable-v2) make terminal exitCode a signed integer (#2545)
• (schema) require exactly one elicitation scope in v2 (#2498)

Other

• (schema) state null handling for every optional v2 field (#2570)
• (schema) mark DefaultOnNull lists with an x-deserialize hint (#2569)
• (schema) fix broken v2 doc anchors (#2565)
• (schema) put the text-content Markdown rule on the content page (#2562)
• (schema) use one description for every v2 _meta field (#2560)
• (schema) define config option defaults via currentValue and state select invariants (#2557)
• (schema) document the elicitation form-schema subset and unrenderable forms (#2556)
• (schema) say permission tool_call subjects apply as tool_call_update upserts (#2554)
• (schema) specify v2 diff baseline, path uniqueness and patch conflicts (#2547)
• (schema) define tool call field defaults and null resets in v2 (#2544)
• (schema) define switch_mode as changing the mode config option in v2 (#2543)
• (schema) note that titled multi-select items omit type, as in MCP (#2538)
• (schema) ExtNotification can be sent by either side (#2534)
• (schema) include -32800's range in the reserved error codes (#2531)
• (schema) write versioned doc links in source and drop the generator's link rewriting (#2525)
• (schema) define which stop reason applies to v2 cancellations (#2523)
• (schema) mark required v2 fields in the docs and rename ClientAuthCapabilities (#2522)
• (schema) use wire names instead of Rust identifiers in schema descriptions (#2520)
• (schema) define Client handling of unknown v2 session states and tool statuses (#2510)
• (schema) define timeline placement for v2 entities (#2509)
• (schema) define session/cancel as cancelling foreground work in v2 (#2508)
• (schema) write the error pages for v1 and v2 (#2504)
• (schema) define receiver behavior for unknown v2 variants (#2500)
• (schema) define when session/set_config_option is available in v2 (#2497)
• (deps) bump the minor group with 9 updates (#2437)

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