Open-source plugin sota-anchor forces Claude Code to check recent library releases before coding

·2026.10.16 23:15

Key point

The free open-source plugin queries PyPI, npm, crates.io, GitHub, and arXiv for the last 12 months of data to prevent Claude Code from rebuilding existing solutions.

Details

A new open-source tool called sota-anchor addresses a common failure mode in Claude Code where the agent assumes a library does not exist because it was released after the model's training cutoff. This often leads to wasted tokens and time as the agent writes workarounds from scratch.

How It Works

The tool functions as a Claude Code plugin and MCP server that forces the agent to query recent data before planning code. It checks the last 12 months of activity across:

  • PyPI
  • npm
  • crates.io
  • GitHub repos
  • arXiv/HF papers

The system operates within a 60-second budget and requires no API key. It mandates that Claude cite dated evidence before deciding whether to install an existing package or build a new solution, effectively inverting negative assumptions like "no library exists for X."

Development and Installation

The plugin was largely written by Claude Code itself, which generated the async Python fetchers for the various registries and wired up the MCP server schema. The tool is available for free on GitHub and can be installed directly via the Claude Code plugin marketplace.

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