shim-cli

See what your coding agent sends. Mask what you can.

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Shim is an open source hook and local proxy that works with Claude Code, Codex, Copilot CLI, and VS Code. In Claude Code, it masks secrets and personal data in tool results before the model ever sees them. The shim watch command shows what a session sent and what it cost. No account to create, no telemetry, just a simple layer that keeps sensitive info where it belongs.