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#function-calling

3 stories

Banner: LLM agent choosing the wrong tool because tool descriptions overlap

AI & Machine Learning Bug Report

LLM agent calls the refund tool for order status questions: overlapping tool descriptions

Ryan Pham · Jul 8, 2026 · 7 min read

Our support agent started opening refund requests when customers only asked where their order was. Tool names and descriptions overlapped, and the agent had 23 tools to choose from. Clear tool contracts, fewer tools per step and a tool-choice eval fixed it.

Banner: streaming LLM tool calls broken by parsing partial JSON argument fragments

Web Development Bug Report

Streaming LLM tool calls: Unexpected end of JSON input from partial arguments

Ryan Pham · Aug 20, 2025 · 7 min read

After we turned on streaming for our assistant, tool calls failed with JSON parse errors and sometimes ran with another call's arguments. We were parsing argument fragments per chunk and keying them by arrival order. Accumulating by index fixed it.

Banner: OpenAI 400 error when parallel tool calls are not all answered with tool messages

AI & Machine Learning Bug Report

OpenAI 400 error: tool_calls must be followed by tool messages for each tool_call_id

Ryan Pham · Jan 16, 2025 · 8 min read

Our support agent started failing with a 400 on roughly one conversation in twelve. The model had begun returning several tool calls in one turn and our loop only answered the first. Answering every tool_call_id in order fixed it.