SKILL·14B6C0

audit-context-building

trailofbits
Updated 14 days ago
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Metadesign

About

This Claude Skill helps developers systematically understand an unfamiliar codebase's architecture, assumptions, and dependencies before vulnerability hunting. It's designed for initial audit, threat model, or architecture review phases, using tools like Grep and Glob to map how the system fits together. The skill focuses solely on building context—explicitly avoiding naming vulnerabilities or suggesting fixes, which are reserved for subsequent phases.

Quick Install

Claude Code

Recommended
Primary
npx skills add trailofbits/skills -a claude-code
Plugin CommandAlternative
/plugin add https://github.com/trailofbits/skills
Git CloneAlternative
git clone https://github.com/trailofbits/skills.git ~/.claude/skills/audit-context-building

Copy and paste this command in Claude Code to install this skill

Documentation

Audit Context Building

Build understanding, not verdicts. This runs before anyone hunts for bugs, and feeds that work.

When to Use

At the start of an audit, a threat model, or an architecture review, when the code is unfamiliar. Also when an earlier pass produced findings nobody could judge, because no one had mapped out how the system fits together.

When NOT to Use

Do not name vulnerabilities, suggest fixes, write proofs-of-concept, or rate severity. Those belong to the hunting phase, which runs next and with the whole picture in hand. When the code counts on something and nothing checks it, record that plainly and move on — whether it matters is decided later.

Not worth the tokens on code you already understand.

Do not analyze in this context

The analysis is long, and this context needs to survive to use it. Dispatch it:

  • A codebase, or more than one function — run /audit-context-building:audit-context <path>. It orients, analyzes each function in its own subagent, and writes audit-context/DOSSIER.md plus one file per function under audit-context/functions/. Only compact records return here.
  • A single function — dispatch the audit-context-building:function-analyzer agent at it. It writes its prose to disk and returns a record.

Then work from what comes back: the index, the unenforced assumptions, the open questions. Read a function's file when you need its detail.

The workflow is what enforces this, not this text: a subagent bound to a return schema cannot return prose. Treat this section as routing, and route.

What comes back, and how to read it

Each record lists what must always be true (with the line that shows it), what the function takes on faith (with whatever establishes it), which functions it calls and what it needs from each, and anything still unclear. The dossier adds the rules that span several functions, who can reach what, and where the complicated parts cluster.

Two things matter more than the rest:

  • Assumptions marked nothing found. The code counts on something being true and nothing anywhere makes it true. This is the most useful thing to hand the hunting phase.
  • The open questions. An honest list of what is still unclear beats a confident answer that turns out to be wrong. Carry them forward instead of closing them out.

Where two records disagree, both are quoted rather than quietly reconciled. That is a fact about the code, not a flaw in the analysis.

The format

ANALYSIS_FORMAT.md defines it, and FUNCTION_MICRO_ANALYSIS_EXAMPLE.md works through examples in C and Solidity. Read them when extending this plugin or deciding whether a record can be trusted.

The format is the same whatever the target. What changes is what fills each slot, and what counts as a call you cannot see inside. DOMAIN_NOTES.md maps that across smart contracts, C and C++, decompiled firmware, and web services — read it when the target is not plain source code.

The rule that matters most: follow the calls. Whether a function is correct usually depends on something another function does, and you cannot see that from the caller alone. A limit looks enforced because the value came back from a function whose name suggests it was checked. So read the function being called, follow every path through it rather than only the one that succeeds, and say what makes each assumption true. When nothing does, use those words: nothing found. Every claim cites a line, or becomes an open question.

GitHub Repository

trailofbits/skills
Path: plugins/audit-context-building/skills/audit-context-building
0
agent-skills
FAQ

Frequently asked questions

What is the audit-context-building skill?

audit-context-building is a Claude Skill by trailofbits. Skills package instructions and resources that Claude loads on demand, so Claude can perform audit-context-building-related tasks without extra prompting.

How do I install audit-context-building?

Use the install commands on this page: add audit-context-building to Claude Code as a plugin, or clone its repository into your skills directory, then restart Claude so it picks up the skill.

What category does audit-context-building belong to?

audit-context-building is in the Meta category, tagged design.

Is audit-context-building free to use?

Yes. audit-context-building is listed on AIMCP and free to install.

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