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Developer replaces 250-line JSON parser with Claude's built-in tool use feature

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A software developer spent weeks building a 250-line JSON parsing layer with seven strategies to handle malformed output from Anthropic's Claude AI in a personal job-search tool. The tool analyzes job listings against the developer's CV and requires structured JSON output for database storage, but early prompt-based approaches produced inconsistent formatting. By defining a single tool with a forced tool_choice parameter and a Pydantic-derived schema, the developer compelled the API to return pre-parsed, schema-validated data directly as a Python dictionary. A single commit on April 14 removed over 200 lines of parsing code, including five fixing functions, a self-repair fallback, and an entire garbage-JSON test suite. The change highlights how Anthropic's tool use feature can serve as a structured output mechanism, not just a way to let models call external functions.

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Developer replaces 250-line JSON parser with Claude's built-in tool use feature · ShortSingh