[acp-release-bot]

🤖 I have created a release beep boop

1.0.0 (2026-10-19)

⚠ BREAKING CHANGES

• AgentSideConnection, ClientSideConnection, Agent, Client, LegacyAgentFactory, createLegacyAgent, and their extension aliases and connector helper have been removed. Use agent()/client() apps and peer-context request()/notify() calls. Compiled tests, fixtures, and examples are no longer published. See MIGRATION_STABLE_UNSTABLE.md for migration instructions.
• Default v1 and experimental v2 imports now expose only stable-feature schemas. Unstable v1 features require @agentclientprotocol/sdk/unstable; unstable v2 features require @agentclientprotocol/sdk/experimental/v2/unstable. Both v2 entrypoints remain experimental. SDK 2.0 does not switch the default protocol from ACP v1. The unversioned JSON schema export is removed; use the versioned schema/v1 or schema/v2 exports. All legacy v1 integrations must migrate to agent()/client() apps regardless of feature profile; opting into /unstable does not restore the removed connection classes or connector helper. See https://github.com/agentclientprotocol/typescript-sdk/blob/main/MIGRATION_STABLE_UNSTABLE.md for migration instructions.

Features

• (breaking) no more auto underscoring of extension methods (#55) (ec4b095)
• Add resilient schema deserialization (#167) (5864e73)
• add unstable session config option handling (#56) (ec7bb47)
• add unstable session/close (#81) (2c9bc77)
• Experimental Streamable HTTP & WebSocket Transport (#155) (d6a3d88)
• experimental: Add experimental ACP v2 API (#223) (26cdeb4)
• Expose request ids in handler contexts (#202) (eda849c)
• isolate NES behind an experimental entrypoint (#284) (e3678c2)
• make stable protocol bindings the default (6caf469)
• New SDK design (see MIGRATION_0.26_0.27.md) (#181) (87e2df3)
• retire legacy connection APIs and publish production-only builds (#294) (52edc15)
• schema: Stabilize addl dirs and remove unstable model selectors (#165) (fa6e302)
• schema: stabilize deleteSession (#168) (2cc77af)
• schema: Stabilize logout and update schema to v0.13.4 (#163) (cfd900a)
• schema: Update schema to 0.11.3 (#88) (0fe246e)
• schema: Update to schema v1.14.0 (#185) (3c619a7)
• schema: Update to v1.13.7 of the schema (#179) (34885b6)
• schema: Update to v1.16.0 of the schema (#199) (de58791)
• schema: update to v1.25.0 and v2.0.0-alpha.8 (#273) (c979649)
• Stabilize closeSession and resumeSession (#132) (806d307)
• Stabilize elicitation APIs (#242) (dc3b0e4)
• Stabilize Session Config Options (#64) (15806a2)
• Stabilize unstable_listSessions to listSessions (#84) (9e89bbc)
• unstable: Add providers/* support (#138) (e234c21)
• unstable: Add initial additionalDirectories and NES support (#104) (43cde3b)
• unstable: add list sessions method (#47) (018f6eb)
• unstable: add list sessions method (#47) (2efd404)
• unstable: add resumeSession support (#41) (721c450)
• unstable: Add session delete handling (#152) (f9384f5)
• unstable: Add support for request cancellation (#195) (d5197f9)
• unstable: Initial unstable elicitation support (#113) (bf259e9)
• unstable: Mark experimental session methods as unstable (#46) (018f6eb)
• Update schema to 1.17.0 (#204) (fa8b5bd)
• Update schema to 1.19.0 (#213) (6599433)
• Update schema to v0.13.2 (#150) (b15960b)
• update schemas to v1.22.0 and v2.0.0-alpha.4 (#253) (a9f08bd)
• update schemas to v1.23.0 and v2.0.0-alpha.5 (#255) (f7941e7)
• update schemas to v1.24.1 and v2.0.0-alpha.7 (#263) (a1a80ff)
• update schemas to v1.26.0 and v2.0.0-alpha.9 (#285) (93599f3)
• Update to 0.10 of the schema (#31) (f026432)
• Update to 0.10.1 of the schema (#36) (210392b)
• Update to 0.10.2 of the schema (#39) (0773dde)
• Update to 0.10.4 of the schema (#49) (018f6eb)
• Update to 0.10.4 of the schema (#49) (6c44fb2)
• Update to 0.10.6 of the schema (#53) (766964e)
• Update to 0.11.0 of the schema (#79) (2763d63)
• Update to schema v1.20.0 and v2.0.0-alpha.2 (#225) (cb61107)
• Update to v0.9.1 of the schema (#28) (6166944)
• v2: check the extensible-union values you build (#268) (8a60383)

Bug Fixes

• accept omitted and null params for optional requests (#282) (a2fbbb9)
• Avoid event loop timing causing out of order messages (#130) (8f514f3)
• avoid spurious unhandledRejection when transport fails mid-sendRequest (#122) (b6b2cb4)
• bound incoming transport message sizes (#259) (69fda37)
• bound per-connection memory in AcpServer (#261) (4356253)
• Cleanup some strange code in the generated schema (#20) (74017f1)
• cleanup zod generation (#170) (be44483)
• correct RPC method call in ClientSideConnection.setSessionModel() (#7) (724df9b)
• emit .js extensions in generated schema barrel for nodenext consumers (#146) (63b96db)
• enforce supported Zod floor and patch generator YAML parser (#296) (f0cab19)
• Event ordering (#153) (7b63226)
• examples: report v2 turn failures on idle (#279) (28b1291)
• Expose peer contexts from app connections (#190) (d657310)
• Flush decoder state at end of NDJSON stream (#119) (4e1b07a)
• Handle ACP connection transport failures cleanly (#103) (028ee3f)
• http: make SSE close and response delivery deterministic (#209) (2adee0f)
• import zod as a namespace so bundlers can tree-shake it (#291) (60619a4)
• inconsistent bigint vs number in zod and schema (#66) (5e3c342)
• jsonrpc: report malformed input (#230) (0819dbe)
• make ndJsonStream receive path linear in message size (#210) (2fc41d2)
• Make sure we use zod/v4 path for imports (#99) (e632d3b)
• node-adapter: Cap HTTP request body size (#186) (3832d4c)
• node-adapter: harden Node adapter request parsing (220eae6)
• Preserve extensible union semantics in TS schemas (#215) (e323221)
• preserve outgoing v2 initialize payloads (#283) (b98857b)
• propagate input stream errors through ndJsonStream (#111) (f57a8d1)
• return valid setSessionModel response object (#4) (c0ff534)
• schema: Update to schema v0.10.7 (#58) (ade1b68)
• server: preserve routed outbound messages (#231) (5f58a95)
• type the routed connection's closed promise as always present (#265) (9d9fa3d)
• unify JSON-RPC message validation policy across transports (#212) (5e01eb2), closes #211
• unstable: Fixes for session/close capabilities (#85) (e8721b7)
• use npx.cmd on Windows in client example (#68) (fdc7815)
• Use TypeScript private keyword instead of ES #private fields (#127) (c6e6ee2)
• v2: align protocol version negotiation (#286) (4197b89)
• v2: decouple session updates from prompt completion (#280) (0154528)
• v2: enforce initialization lifecycle (#235) (b7d6e81)
• v2: enforce method contracts (#229) (0101014)
• Zod type inference errors (#177) (d9fafa2)

Miscellaneous Chores

• release 1.0.0 (#201) (008fc28)

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