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Harden

Harden Agentic Integrity Foundation runs local cybersecurity models on macOS and Linux to monitor and stop dangerous coding agent tool calls before execution.

Code & ITEvaluates and intercepts tool calls…Blocks prohibited commands, redacts…Detects installed coding agents such as…Maintains a local audit log and…
Harden product interface screenshot
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What Is Harden? Product Overview

What the product does and how it is positioned

Harden Agentic Integrity Foundation is a local-first security layer created to supervise autonomous coding agents. Instead of depending entirely on sandboxes or remote guardrails, it executes specialized cybersecurity models directly on developer workstations to inspect tool calls before they run.

The platform supports environments like Claude Code, Cursor, Codex, and others through native hooks or an MCP proxy fallback. By evaluating commands in real time, it blocks unauthorized actions, suggests safe alternative retries, and records complete session histories locally on disk.

What Can You Use Harden For?

Source-supported ways to use the product

Production Command Guarding

Intercepts destructive terminal or cloud commands, such as deleting critical namespaces, and redirects the agent to safe staging alternatives.

Pre-Execution Secret Flow Prevention

Scans agent tool actions locally to catch and block or redact unauthorized secret exposure prior to tool execution.

Local Agent Auditing

Tracks all allowed, modified, and stopped tool calls across coding sessions in a local-only audit store.

How to Use Harden

The documented workflow, where available

  1. 1

    Install via Shell Script

    Download and run the local installation script using the provided curl command on a supported machine.

  2. 2

    Run Configuration

    Execute the configuration command to detect supported coding agents present on the machine and activate hooks or proxy routes.

  3. 3

    Pre-Execution Tool Interception

    Run connected coding agents normally while the background monitor inspects each tool call, applying allow, block, redact, or retry steering decisions.

Local Execution and Agent Hook Architecture

Harden Agentic Integrity Foundation operates directly on the host machine to monitor autonomous agent behavior. Rather than relying on cloud proxies or post-execution log parsing, it inserts inspection points directly ahead of tool invocation via native agent hooks or an MCP proxy fallback.

Decisions are determined locally on the machine. Tool calls can proceed unaltered, be logged passively, have sensitive elements redacted, or be blocked outright with recommended alternative commands provided back to the agent session.

  • Supports native hooks for validated agents including Claude Code, Codex, Cursor, Kiro, Hermes, and OpenClaw.
  • Provides MCP proxy integration to inspect tools outside native hook coverage.
  • Retains session decision logs directly on local storage without forced retention cutoffs.

What to Test Before Choosing Harden

Checks to run with your own material and workflow

  • Confirm your local hardware satisfies the 16 GB memory minimum and 15 GB free disk requirement on macOS or Linux x86_64.
  • Check whether your coding agent setup relies on Windows, which is currently unsupported.
  • Verify that your active coding agent version aligns with the platform baseline validated versions.

Harden Sources and Last Checked

What was checked and when

Official source
https://harden.run/
Last checked
Category
Code & IT

Harden Frequently Asked Questions

Answers based on the source-checked product record

What platforms and operating systems are supported by Harden?

Harden supports macOS and Linux x86_64 for its CLI and daemon, with Apple Silicon and Metal required for the full local model. Windows is currently not supported.

Does Harden require an account to run locally?

No account or credit card is required to install and use the core local pre-execution features on your machine.

Which coding agents are validated to work with Harden?

Documented validated agents include Claude Code, Codex, Antigravity CLI, Cursor, Kiro, Hermes, and OpenClaw.

What happens when an agent tool call is flagged as unsafe?

Harden can block the action, redact sensitive components, or supply a safe retry command suggestion back to the agent session.

Where is the audit and decision data stored?

Audit records, session data, and decision histories are stored locally on the user device without an enforced retention limit.

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