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Function Calling Edge Cases and Production Hardening (ANSWERED)

Project BasedGPTMedium14 min read

**Common failures** Model calls nonexistent tool; args wrong type; parallel tool_calls partial failure; streaming partial JSON; user content tricks model into exfil tool args.

TL;DR — Quick Answer

Handle parallel calls, malformed JSON, schema drift, hallucinated function names, argument injection, and retry storms with strict schemas, validation, allowlists, structured outputs fallback, and host-side enforcement.

The Interview Question

What edge cases break OpenAI function calling in production and how do you harden against them?

Deep Explanation

Common failures Model calls nonexistent tool; args wrong type; parallel tool_calls partial failure; streaming partial JSON; user content tricks model into exfil tool args.

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