# Harness Writing

> Writing effective fuzzing harnesses for security testing.

- Skill: `plurigrid/harness-writing` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add plurigrid/harness-writing`
- Raw SKILL.md: https://api.skillmd.com/api/skills/plurigrid/harness-writing/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- License: AGPL-3.0
- Author: plurigrid (https://skillmd.com/u/plurigrid)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/plurigrid/harness-writing

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# Harness Writing Skill

**Trit**: 1 (PLUS)
**Category**: testing-handbook-skills
**Author**: Trail of Bits
**Source**: trailofbits/skills
**License**: AGPL-3.0

## Description

Writing effective fuzzing harnesses for security testing.

## When to Use

This is a Trail of Bits security skill. Refer to the original repository for detailed usage guidelines and examples.

See: https://github.com/trailofbits/skills

## Related Skills

- audit-context-building
- codeql
- semgrep
- variant-analysis


## SDF Interleaving

This skill connects to **Software Design for Flexibility** (Hanson & Sussman, 2021):

### Primary Chapter: 8. Degeneracy

**Concepts**: redundancy, fallback, multiple strategies, robustness

### GF(3) Balanced Triad

```
harness-writing (+) + SDF.Ch8 (−) + [balancer] (○) = 0
```

**Skill Trit**: 1 (PLUS - generation)


### Connection Pattern

Degeneracy provides fallbacks. This skill offers redundant strategies.