Allow deferring plain-text MCP output in thread item listings (#60390)

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## What changed

Add experimental `deferOutput.mcpToolCall` support to `thread/items/list` requests scoped to a `turnId`. Successful, completed MCP calls with nonempty, unannotated plain-text results can return empty `result.content` with `outputDeferred: true`. Clients can retrieve the saved output through `thread/items/read`; connector identity remains on the listed item.

Keep rich results, JSON or fenced text, app UI results, and built-in `codex_app` results inline. Preserve plain-text output when creating bounded previews of oversized MCP results so those previews remain eligible for deferral. Reads return the saved preview when output exceeds the 64 KiB history limit.

## Testing

Extend thread history integration coverage for independent and combined command/MCP deferral, experimental capability gating, excluded result types, connector identity, oversized previews, and retrieval of deferred items.

GitOrigin-RevId: 5c160b30a4eac2a9b70e3fa65b6dbd83e935338b

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This commit is contained in:

Brent Traut

2026-11-09 12:54:12 +00:00

committed by copyberry

parent e787af9624

commit d2b4d63e95

7 changed files with 307 additions and 64 deletions

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codex-rs/app-server-protocol/schema/precomputed/app-server-exports-experimental.json.zst

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