Harden
Free local security layer that checks AI agent tool calls before they run.
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Harden AIF is a free, local security tool built specifically for AI coding agents. It uses a post-trained model to inspect tool calls before execution, analyzing your request and session context to catch potentially dangerous actions.
The tool beat frontier models on key agent-security benchmarks while keeping your repository and tool output completely on your machine. No data leaves your environment — everything runs locally.
Harden addresses a critical gap in the AI agent ecosystem: as agents gain more autonomy to execute tools, browse the web, and modify code, security becomes paramount. Harden provides that safety net without requiring cloud services or subscription fees.
AI-assisted draft, human-reviewed before publishing — see how we choose & review tools.
Why we picked it
Harden made the cut for being free, local, and genuinely benchmarked — it inspects a coding agent's tool calls before they run and keeps your repo entirely on your machine. Worth adding as a safety layer regardless of which coding agent you already use.
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