codex

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Celia Chen 89a3b89c4c Route MCP auth discovery through runtime HTTP clients (#35239 )

## Why

MCP authentication checks need to use the same HTTP routing as the MCP
transport so servers reached through configured proxies can be discovered
reliably.

## What changed

- Resolve OAuth discovery and authentication status through each server's
  runtime HTTP client for both local and managed environments.
- Keep local discovery capped at five seconds while allowing explicit login
  requests to retain their requested timeout.
- Resolve refreshed MCP configuration and its runtime context from the same
  snapshot.

## Testing

- Cover OAuth discovery through an environment proxy and macOS system proxy
  resolution.
- Cover proxied MCP startup and runtime refresh with updated authorization
  headers.
- Verify capped and preserved OAuth discovery timeout policies.

GitOrigin-RevId: 461fb1d4786e547df8b1e6b2215a8ac40438a3aa

2026-07-24 20:04:23 +00:00