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Problem
A malformed tool in a user's inherited MCP configuration can prevent the Wizard's Anthropic agent from starting, even though its own MCP servers are valid. Addresses #1091.
Changes
Set
strictMcpConfig: trueat both SDK query call sites. Regression tests cover the main agent and tutorial, including resumed queries and the main agent's explicit subagent server names.The error deduplication and message improvements described in the issue remain separate.
Test plan
The new assertions failed before the fix. All 249 tests across the agent test directory and agent-interface suite pass afterward. Build, CLI smoke checks, Warlock smoke checks, and formatting/lint on the changed files pass.
Using the pinned SDK 0.3.169 against a local provider fixture, the current configuration sent 27 tools including the malformed inherited tool. With isolation enabled it sent 26, keeping the explicit server. A dispatched general-purpose subagent also retained that server and excluded the inherited one. The fixture models the reported 400; this was not a live Anthropic call.
pnpm typecheckreports the same 27 existing errors on this branch and untouchedmainate88050da. None are in changed files. A full authenticated Wizard install was not run.LLM context
Agent-assisted contribution. Codex helped reproduce the issue, implement and test the fix, and perform independent code and security reviews.