Ben Romano ce7df36237 Overlap startup WebSocket preconnect with tool discovery (#47635) ...

## Why

Startup prewarm waited for tool discovery before opening its WebSocket connection. Slow MCP startup therefore delayed connection setup even though the handshake could proceed independently.

## What changed

- Run the WebSocket handshake concurrently with tool capture, then send `generate=false` with the discovered tools and finalized request metadata.
- Include model and effective service-tier routing hints in preconnect, including the inherited tier for spawned subagents. Omit routing hints for guardian reviewer requests.
- Recover authentication failures during preconnect and switch to HTTP fallback on `426 Upgrade Required`.

## Testing

Add and extend regression coverage for handshake overlap with delayed MCP discovery, cancellation before warmup, finalized Responses Lite tool metadata, socket reuse and reconnection, service-tier changes and inheritance, and authentication recovery during preconnect.

GitOrigin-RevId: ecb53540765df8227e55e79910a13a05260a4c8d

2026-09-23 19:16:20 +00:00

..

src

Overlap startup WebSocket preconnect with tool discovery (#47635)

2026-09-23 19:16:20 +00:00

BUILD.bazel

app-server: move transport into dedicated crate (#20545)

2026-05-01 09:23:47 -07:00

Cargo.toml

Extract WebSocket authentication into codex-websocket-auth (#47447)

2026-09-23 04:25:28 +00:00