Dev Tools · 1h ago
Reverse-engineering Claude's undocumented API to slash sync costs from 665k tokens
A developer built a CLI tool to sync Claude Design projects locally, bypassing the costly approach of using an AI agent to read every file. The undocumented MCP endpoint was reverse-engineered, revealing quirks like map returns and 403 errors. The resulting tool performs syncs for a fraction of the token cost, with live tests ensuring protocol accuracy.
Meridian48 take
The story underscores a growing tension: as AI tools become platforms, their undocumented APIs invite clever workarounds that may break with updates.
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I reverse-engineered Claude's undocumented Design API so a file sync wouldn't cost 665k tokens →
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