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Agents JS SDK errors and fixes: 1 guide

Real Agents JS SDK failures, each with the error you'll see, the cause and steps that worked. 1 of 1 fixed upstream. Search within Agents JS SDK.

Fixed: 1

Agents JS SDKFixed (verified)
Deferred hosted MCP execution is rejected after namespace-shaped tool discovery
A deferred hosted MCP server can be discovered through tool_search, then executing a discovered tool on the next MemorySession turn throws ModelBehaviorError: Model produced deferred MCP call OpenAI_Docs before it was loaded via tool_search.
Last checked Oct 19, 2026#tool-calls#error-messages2 steps →

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