shim-cli Review
In the burgeoning landscape of AI-powered development, maintaining privacy and security is paramount. Enter shim-cli, an indispensable open-source CLI tool designed as your vigilant guardian against data leakage when interacting with AI coding agents like Claude Code, Codex, Copilot CLI, and VS Code. It runs discreetly on your local machine, intercepting the data your agent prepares to send to the model, scrutinizing it for sensitive information, and sanitizing it where permissible.
At its core, shim-cli offers a critical layer of observability and control. It actively finds secrets and personal data within your agent’s outgoing communications, replacing them with generic placeholders like <SECRET_1>. Beyond proactive masking, it provides invaluable insights into your AI sessions, detailing what data was sent and even tracking the associated costs, ensuring you retain full oversight of your digital footprint.
Main Features
- Intelligent Data Masking: Automatically identifies and masks a wide array of sensitive data, from API keys and database URIs to personal identifiers and financial details, before it ever reaches the model.
- Session Auditing & Cost Tracking: For Claude Code users, shim-cli can audit past sessions, counting tokens, spend, and surfacing any sensitive values that bypassed protection.
- Agent-Specific Hooks: Integrates seamlessly with various coding agents through native hooks or plugins, adapting its behavior to each client’s capabilities.
- Local & Transparent Operation: Designed for privacy, shim-cli runs entirely on your machine, with no external accounts, telemetry, or network calls to external shim services. Its Apache-2.0 license means the code is fully auditable.
Main Target
shim-cli is engineered for developers, engineers, and organizations leveraging AI coding assistants. If you use:
- Claude Code
- Codex
- Copilot CLI
- VS Code (with its plugin)
…and are concerned about inadvertent exposure of sensitive data, proprietary code, or personal information to large language models, then shim-cli is built for you. It empowers you to harness the power of AI agents without compromising your data privacy or security posture.
Here’s a glimpse of what shim-cli adeptly detects:
| Category | Examples |
|---|---|
| Financial Data | IBANs, Credit Cards |
| Personal Identifiers | Email Addresses, Phone Numbers, National IDs |
| Security Credentials | API Keys, Passwords, Database URIs |
| Network Information | IP Addresses, MAC Addresses |
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