Added

• (unstable-v2) Add streaming tool-call content in v2 (#1407)
• (unstable-v2) Add v2 whole-message session updates (#1396)
• (unstable-v2) Unify v2 tool call updates (#1390)
• (unstable-v2) Require auth method type discriminator in v2 (#1387)
• (unstable-v2) Nest session-scoped capabilities under session (#1373)

Fixed

• (rust) Preserve JSON object key order (#1393)
• (schema) Add missing _meta fields to protocol schemas (#1440)
• (unstable-v2) Tolerate errors in v1/v2 conversions (#1420)
• (unstable-v2) Clean up old agent auth deserialization (#1388)

Other

• Setup separate publishes for JSON Schemas (#1377)

Fixed

• (schema) Add missing _meta fields to protocol schemas (#1440)
• (rust) Preserve JSON object key order (#1393)

Other

• Fix versioning for new schema git releases (#1382)
• Setup separate publishes for JSON Schemas (#1377)

Added

• (schema) Stabilize optional message IDs (#1372)
• (schema) Stabilize session usage updates (#1371)
• (schema) Stabilize session/delete (#1370)
• (unstable-v2) Remove MCP SSE transport and make stdio opt-in (#1368)
• (unstable-v2) Clean up capability objects (#1367)
• (unstable-v2) Require message IDs in v2 chunks (#1352)
• (unstable-v2) Adopt plan_update as v2 plan shape (#1347)
• (unstable-v2) Remove v2 client filesystem and terminal surface (#1346)

Fixed

• (unstable) Fix plan capability key (#1369)

Other

• (rfd) Add JSON-RPC batch guidance for v2 (#1348)
• (rfd) Split end-turn token usage from session usage (#1345)
• (rfd) Clarify agent-owned message IDs in RFDs (#1344)
• (deps) bump the minor group with 5 updates (#1341)
• Render feature docs in docs.rs (#1331)

Added

• (schema) Experiment annotating lenient deserialize opportunities (#1328)
• Stabilize additionalDirectories for sessions (#1327)
• (unstable) Remove unstable session model API (#1325)
• (unstable-v2) Remove dedicated session modes and models apis from v2 (#1324)
• (unstable) Add v2 enum extension RFD and fallbacks (#1304)

Other

• Move existing protocol docs to v1 (#1326)
• Add some draft v2 protocol docs and schema (#1306)

Added

• (unstable) Add unstable plan operations (#1299)

Added

• Stabilize logout method (#1273)

Fixed

• (unstable) Rename provider method types to singular (#1272)

Other

• (rfd) Move additional directories RFD to Preview (#1276)
• Add schema download note to schema page (#1269)
• (deps) bump num-conv from 0.2.1 to 0.2.2 in the minor group (#1244)
• Set minimum supported Rust version (#1232)
• Document ACP versioning semantics (#1229)

Fixed

• (unstable) Update additionalDirectories guidance (#1227)

Added

• (unstable) Add unstable session delete support (#1216)

Added

• (unstable) Add experimental MCP-over-ACP message types (#1185)

Other

• add unstable mcp-over-acp additions to the schema (#1173)
• (deps) bump the minor group with 3 updates (#1178)
• (deps) bump the minor group with 2 updates (#1121)
• (unstable) Start setting up v2 Schema scaffolding for experimentation (#1099)
• reorganize to v1 module (#1094)

Added

• Stabilize session/close (#1062)
• Stabilize session/resume (#1051)