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. It keeps secrets and personal data out of tool results so the model never sees them, especially in Claude Code. The shim watch command shows you what a session sent and what it cost. There is no account to create and no telemetry to worry about, so you keep full visibility and privacy.