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Speed up /mcp inventory listing (#16831)

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Addresses #16244

This was a performance regression introduced when we moved the TUI on
top of the app server API.

Problem: `/mcp` rebuilt a full MCP inventory through
`mcpServerStatus/list`, including resources and resource templates that
made the TUI wait on slow inventory probes.

Solution: add a lightweight `detail` mode to `mcpServerStatus/list`,
have `/mcp` request tools-and-auth only, and cover the fast path with
app-server and TUI tests.

Testing: Confirmed slow (multi-second) response prior to change and
immediate response after change.

I considered two options:
1. Change the existing `mcpServerStatus/list` API to accept an optional
"details" parameter so callers can request only a subset of the
information.
2. Add a separate `mcpServer/list` API that returns only the servers,
tools, and auth but omits the resources.

I chose option 1, but option 2 is also a reasonable approach.
This commit is contained in:
Eric Traut
2026-04-06 16:27:02 -07:00
committed by GitHub
parent 756c45ec61
commit 9f737c28dd
16 changed files with 384 additions and 61 deletions
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codex-rs/app-server/README.md
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@@ -187,7 +187,7 @@ Example with notification opt-out:
- `mcpServer/oauth/login` — start an OAuth login for a configured MCP server; returns an `authorization_url` and later emits `mcpServer/oauthLogin/completed` once the browser flow finishes.
- `tool/requestUserInput` — prompt the user with 1–3 short questions for a tool call and return their answers (experimental).
- `config/mcpServer/reload` — reload MCP server config from disk and queue a refresh for loaded threads (applied on each thread's next active turn); returns `{}`. Use this after editing `config.toml` without restarting the server.
- `mcpServerStatus/list` — enumerate configured MCP servers with their tools, resources, resource templates, and auth status; supports cursor+limit pagination.
- `mcpServerStatus/list` — enumerate configured MCP servers with their tools and auth status, plus optional resources/resource templates when requested; supports cursor+limit pagination. If `detail` is omitted, the server defaults to `full`.
- `windowsSandbox/setupStart` — start Windows sandbox setup for the selected mode (`elevated` or `unelevated`); accepts an optional absolute `cwd` to target setup for a specific workspace, returns `{ started: true }` immediately, and later emits `windowsSandbox/setupCompleted`.
- `feedback/upload` — submit a feedback report (classification + optional reason/logs, conversation_id, and optional `extraLogFiles` attachments array); returns the tracking thread id.
- `config/read` — fetch the effective config on disk after resolving config layering.