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When streaming, the client tries to detect whether the model is producing a tool call vs. a regular text response by watching for the tool-call marker. Sometimes the marker arrives split across two tokens and the client's regex misses it, rendering a broken UI state.
An MCP server (stdio transport) works flawlessly when configured in Claude Desktop but times out or returns nothing when invoked from a custom agent using @anthropic-ai/sdk's tool_use interface. No error logs on either side. The server process starts, but no tool call ever arrives.