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codex/codex-rs/exec
bear-oai 406dc92394 Expose MCP read-only hints in tool call items (#36055)
## What changed

- Propagate MCP tool `readOnlyHint` annotations through tool-call start and
  completion events.
- Include the optional hint in persisted thread history and app-server
  `mcpToolCall` items, preserving compatibility when the annotation is absent.
- Document that the hint describes tool capability, not the outcome of a
  particular invocation.

## Testing

- Cover read-only and write-capable tools in live events and persisted rollout
  data.
- Verify the hint survives thread reads and resumes for both in-progress and
  completed MCP calls.

GitOrigin-RevId: dddfe905146075e5137a1094da485b86b99807f0
2026-07-30 01:37:41 +00:00
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