# Agent Harness

An agent harness is the surrounding system that gives an AI agent its tools, instructions, permissions, and evaluation loop.

## Why it matters

A capable model alone is not a dependable agent. The harness determines which tools the model can use, how state is stored, when execution stops, what gets logged, and where human approval is required. Most production reliability work happens in this surrounding system.

## Example

An operations agent receives read-only CRM access, a write tool limited to draft records, a maximum step count, retry rules, and an approval gate before any customer message is sent.

## FAQ

### What is Agent Harness in simple terms?

An agent harness is the surrounding system that gives an AI agent its tools, instructions, permissions, and evaluation loop.

### Why does Agent Harness matter for teams using AI?

A capable model alone is not a dependable agent. The harness determines which tools the model can use, how state is stored, when execution stops, what gets logged, and where human approval is required. Most production reliability work happens in this surrounding system.

### What is a practical example of Agent Harness?

An operations agent receives read-only CRM access, a write tool limited to draft records, a maximum step count, retry rules, and an approval gate before any customer message is sent.


Source: https://www.luffy.so/ai-glossary/agent-harness

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