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In
@anthropic-ai/claude-agent-sdkv0.3.142 (included in~0.3.0), MCP servers now connect in the background by default — sessions start immediately and slow servers are reported asstatus: "pending"in theinitevent until ready. Previously the SDK waited up to 5 s for servers to connect before starting the first turn.The agent configures a single, critical MCP server (
@workos/mcp-docs-server) that provides the WorkOS documentation used throughout the integration workflow. Under the new default, the agent can begin its first turn before that server is ready, meaning WorkOS MCP tools may be absent or pending on turn 1. The existingAgentSignals.ERROR_MCP_MISSINGguard only fires if the agent explicitly emits the[ERROR-MCP-MISSING]signal string — it will not fire for a pending-state MCP tool failure, so the regression could be silent.To preserve the previous behaviour, either set
MCP_CONNECTION_NONBLOCKING=0insdkEnvor addalwaysLoad: trueto theworkosMCP server entry insrc/lib/agent-interface.ts.Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!