---
title: "Coverage Analysis - Air Market"
description: "You have a fuzzer running but no idea how much of the code it really gets to. This measures which code was exercised during fuzzing. Reach for it when you want to judge whether a harness is any good,…"
canonical: "https://airmarket.ai/app/coverage-analysis"
---

[Air Market](/) / [Security](/category/security) / Coverage Analysis

Skill by [Trail of Bits](/@trailofbits)

# Coverage Analysis

See what your fuzzer is actually reaching, and what it never touches

## What this does

You have a fuzzer running but no idea how much of the code it really gets to. This measures which code was exercised during fuzzing. Reach for it when you want to judge whether a harness is any good, or work out what is blocking the fuzzer from getting deeper.

### Top 3 things it does for you

- Measure what code the fuzzing run exercised
- Find out why the fuzzer is stuck
- Check whether a harness is doing its job

## Information

**Coverage Analysis at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [Trail of Bits](/@trailofbits) |
| Category | [Security](/category/security) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Size | 23 KB |
| Licence | CC-BY-SA-4.0 |
| Repository | [trailofbits/skills](https://github.com/trailofbits/skills/tree/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/coverage-analysis) |
| GitHub stars | 6,823 (as of Nov 2026) |
| Installs | 5,854, counted by skills.sh (Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of Coverage Analysis and flagged nothing. AIR's verdict: **safe**.

**What Coverage Analysis's check was run against**

|  |  |
| --- | --- |
| Commit | d5fe2e6a7896236c3102fd5477e833623ad70298 |
| Content hash | e7588a41914d45bb5ec608f49af2a27311b6b3db6b5eff9cd08c6d088bbda215 |
| Files read | [Browse the files at this exact commit](https://github.com/trailofbits/skills/blob/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/coverage-analysis/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for Coverage Analysis](/security/coverage-analysis)

## About Coverage Analysis

Coverage analysis measures the code exercised during fuzzing.

Use it when assessing harness effectiveness or identifying what is blocking a fuzzing run.

## What's inside

- SKILL.md - instructions
- agents/openai.yaml - data
- assets/trail-of-bits-mark.svg - template

## Questions

### Is Coverage Analysis safe to install?

AIR scanned this exact version of Coverage Analysis and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit d5fe2e6a7896, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/coverage-analysis.

### How do I install Coverage Analysis?

Open https://airmarket.ai/app/coverage-analysis on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/trailofbits/skills/tree/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/coverage-analysis. Install from that link, not the branch.

## Related on Air Market

- [More Security listings](/category/security)
- [Everything by Trail of Bits](/@trailofbits)

---

Canonical URL: <https://airmarket.ai/app/coverage-analysis>