jif-oai f20f8a719e memories/mcp: generate tool schemas with schemars (#21012) ...

## Why

The memories MCP server currently keeps handwritten JSON Schema beside
the Rust types that actually serialize and deserialize the tool
payloads:
[`schema.rs`](2f5c06a29c/codex-rs/memories/mcp/src/schema.rs (L4-L133)),
[`server.rs`](2f5c06a29c/codex-rs/memories/mcp/src/server.rs (L44-L75)),
and
[`backend.rs`](2f5c06a29c/codex-rs/memories/mcp/src/backend.rs (L41-L117)).
That duplicates the tool contract and makes schema drift easier as the
API evolves.

## What changed

- derive `JsonSchema` for the memories tool arguments, responses, and
nested response types
- replace the handwritten schema builders with shared `schemars`
generation
- preserve the existing wire shape while generating schemas, including
nullable output `Option` fields and non-nullable optional input fields
- wire the `list`, `read`, and `search` tools to the generated schemas

## Verification

- CI pending

2026-05-04 18:40:17 +02:00

334 KiB

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