Why

The core Op::ListMcpTools request path is no longer needed. Keeping it around left a dead request/response surface alongside the app-server MCP inventory APIs that own current server status listing.

What Changed

• Removed Op::ListMcpTools, EventMsg::McpListToolsResponse, and the core handler that built the MCP snapshot response.
• Removed the now-unused codex-mcp snapshot wrapper/export and passive event handling arms in rollout and MCP-server consumers.
• Updated tests that used the old op as a synchronization hook to wait on existing startup/skills events, and deleted the plugin test that only exercised the removed listing op.

Validation

• cargo test -p codex-protocol
• cargo test -p codex-mcp
• cargo test -p codex-rollout -p codex-rollout-trace -p codex-mcp-server
• cargo test -p codex-core --test all pending_input::queued_inter_agent_mail
• cargo test -p codex-core --test all rmcp_client::stdio_mcp_tool_call_includes_sandbox_state_meta
• cargo test -p codex-core --test all rmcp_client::stdio_image_responses
• just fix -p codex-core -p codex-protocol -p codex-mcp -p codex-rollout -p codex-rollout-trace -p codex-mcp-server