Files
codex/codex-rs/tools/src
Charlie Marsh f3803587c9 Share tool output schemas and defer MCP envelope construction (#45439)
## Why

MCP tool parsing eagerly cloned structured output schemas and built full call-result envelopes. Cloning tool definitions also copied their output-schema JSON, even before a consumer needed it.

## What changed

- Introduce `ToolOutputSchema` with immutable `Arc` storage so tool definitions share output schemas when cloned.
- Retain MCP structured output schemas and materialize the call-result envelope only when JSON is requested.
- Update code-mode consumers and schema mutation sites to materialize JSON explicitly, reusing uniquely owned storage when possible.
- Move structured content into the MCP envelope without an extra clone, preserving property order.

## Testing

Add tests for JSON preservation, mutation isolation, equality between lazy and materialized schemas, reuse of uniquely owned storage, and equivalent code-mode definitions.

GitOrigin-RevId: e98ba4c2f0efedc99f7cbc7bba206cc63a3bd8f4
2026-09-14 15:05:16 +00:00
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