shim-cli is an open-source hook and local proxy for coding agents including Claude Code, Codex, Copilot CLI, and VS Code. It finds secrets and personal data in what your agent sends, masks them where the client allows it, and shows what each Claude Code session sent and cost. It runs locally with no account and no telemetry.
shim-cli
See what your coding agent sends. Mask what you can.
shim-cli Introduction
Key Features
- Masks secrets and personal data in tool results before the model reads them (in Claude Code)
- shim watch shows what a session sent and its cost
- Works as a hook and local proxy for Claude Code, Codex, Copilot CLI, and VS Code
- Runs locally with no account and no telemetry
- Open source
Use Cases
- Preventing secrets and personal data from reaching AI coding agents
- Auditing what a coding agent session sent and its associated cost
- Adding privacy controls to AI-assisted development workflows
Why Startups Use It
Startups adopting AI coding agents can use shim-cli to reduce the risk of leaking secrets or personal data, while gaining visibility into what their agent sessions send and cost — all through a free, open-source local tool.
Frequently Asked Questions
Which coding agents does shim-cli support?
It supports Claude Code, Codex, Copilot CLI, and VS Code.
Does shim-cli require an account?
No. It runs locally with no account and no telemetry.
Is shim-cli open source?
Yes, shim-cli is an open-source CLI.
More About shim-cli
PricingPaid
Listed DateOct 19, 2026
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