Pre-execution tool-call checks
Checks AI coding-agent tool calls before they run.
Coding / product dossier
Harden
A local model that checks AI coding-agent tool calls before they execute.
Product brief
What Harden does.
Harden AIF is a free, local security tool for AI coding agents. Its post-trained model checks tool calls before they run, using your request and session context. It beat frontier models on key agent-security benchmarks, while keeping your repo and tool output on your machine.
Why we selected it
A concrete security control for a fast-growing deployment risk: agents taking unsafe actions through tools. Local operation, session-aware tool-call checks, and no repo or tool-output egress make it particularly relevant
- Best for
- Developers securing coding agents
- Category
- Coding
- Daily picks
- 1
- First selected
- 2026-09-09
Product preview saved with our daily selection
Capability scan
What it can help with.
Only capabilities supported by the product information we collected are listed here.
Request and session context
Uses the user's request and session context when checking tool calls.
Local operation
Operates locally.
On-machine repository and tool output
Keeps the repository and tool output on the user's machine.
Post-trained security model
Uses a post-trained model for its tool-call checks.
Best-fit use cases
Check coding-agent tool calls before execution.
Apply a security layer around an AI coding agent's tool use.
Review tool calls using the current request and session context.
Keep repository and tool output on the local machine while using the tool.
FAQ
Before you open it.
What is Harden AIF?
Harden AIF is a free, local security tool for AI coding agents.
What does Harden check?
It checks tool calls before they run.
What context does it use for checks?
It uses the user's request and session context.
Where do repository and tool-output data remain?
The description states that the repository and tool output stay on the user's machine.
Who is Harden intended for?
It is positioned for developers securing coding agents.