codex

marked agent tool as supports_parallel_tool_calls = true

fixed config merge bug + added tests

The synchronous Node.js subprocess check was removed for sub-agents. The parent session already validates Node availability and disables relevant features if missing; running node --version for every agent in a 100-agent fan-out creates hundreds of concurrent processes and stalls the runtime on Windows.

eager hydration (hydrate_collab_agent_metadata_for_notification) was removed from this hot path. It performs a synchronous thread_read RPC to the app-server which blocks the TUI event loop for seconds when the app-server is busy with agent spawns. Agent metadata (nickname, role) is populated lazily through the collab spawn-end events and on-demand when the agent picker is opened or a thread switch occurs.