{"version":"2.1.274","anchor":"new-env-var-capscontrols-mcp-connector-startup-wait","canonical_anchor":"new-env-var-capscontrols-mcp-connector-startup-wait","heading":"New env var caps\/controls MCP connector startup wait","tier":"use","area":"MCP","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.274\/e\/new-env-var-capscontrols-mcp-connector-startup-wait","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.274","markdown":"### New env var caps\/controls MCP connector startup wait\n\nNew CLAUDE_CODE_MCP_STARTUP_WAIT_MS env var controls how long Claude Code waits for MCP servers to start\n\n**What**\n\nA new environment variable, `CLAUDE_CODE_MCP_STARTUP_WAIT_MS`, controls how long Claude Code waits for MCP (Model Context Protocol) connector servers to start up. When set, it overrides the normally computed wait time, though it's still capped by an internal maximum. Setting it to a value greater than 0 also switches on waiting for 'deferrable' MCP connections, which otherwise may not be waited for.\n\n**Why**\n\nThis gives users a way to tune startup behavior for MCP servers that are slow to connect, instead of being stuck with a fixed built-in timeout.\n\n- Area: MCP\n- Names: `CLAUDE_CODE_MCP_STARTUP_WAIT_MS`\n- Tier: Use it now\n- Useful: 5\/5\n- Signal: 2\/5"}