3 pages for mcp_connection_nonblocking.
Titles and paths first, then pages whose text carries it. Each row opens that page as this site last read it.
Connect to external tools with MCP
Claude Code CLI · in the page
agent-sdk/mcp
…tartup itself wait, before Claude Code sends the init message: * **[`MCP_CONNECTION_NONBLOCKING`](/docs/en/env-vars) set to `0`**: startup waits for the whole connection batch, up to 5 seconds by def…
Connect Claude Code to tools via MCP
Claude Code CLI · in the page
mcp
…ld startup. Other servers connect in the background by default; set [`MCP_CONNECTION_NONBLOCKING=0`](/docs/en/env-vars) to make startup wait for them too. ### Defer a server's tools To keep all of a…
Customize sessions in self-hosted environments
Claude Code CLI · in the page
self-hosted-environments-configuration
…mcp#exempt-a-server-from-deferral), or for all servers when you set [`MCP_CONNECTION_NONBLOCKING=0`](/docs/en/env-vars) in the runner's environment. HTTP and SSE servers otherwise connect in the backg…