Skip to content
Security
Skill

/audit-context-building

Understand a codebase before looking for bugs in it - what each function assumes, what it guarantees, and what it depends on elsewhere. Use when starting an audit, threat model, or architecture review on unfamiliar code, and before any vulnerability-hunting pass.

From plugin
skills
7.9k95 skills30 agents8 commands1 MCP

Claude Code

$ npx -y skills add trailofbits/skills --skill audit-context-building --agent claude-code

SKILL.md

audit-context-building.SKILL.md
name: audit-context-building
description: Understand a codebase before looking for bugs in it - what each function assumes, what it guarantees, and what it depends on elsewhere. Use when starting an audit, threat model, or architecture review on unfamiliar code, and before any vulnerability-hunting pass.
allowed-tools: Workflow Task Read Grep Glob

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](resources/ANALYSIS_FORMAT.md) defines it, and [FUNCTION_MICRO_ANALYSIS_EXAMPLE.md](resources/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](resources/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.

Read more
@trailofbits
Ships withskills

Trail of Bits skills and plugins for AI-assisted security analysis, testing, and development. Install this marketplace in Claude Code or Codex, or import it into your ChatGPT workspace marketplace.

7.9k95 skills30 agents1 MCP
Get the whole plugin

Stars on GitHub

Momentum

stars in total
7.9k
Star history of trailofbits/skills on GitHub, a chart by star-history.com

Other skills on skills.

agentic-actions-auditor

agentic-actions-audito…

Audits GitHub Actions workflows for security vulnerabilities in AI agent integrations including Claude Code Action, Gemini CLI,…

@trailofbits@trailofbitsInstall Skill
audit-prep-assistant

audit-prep-assistant

Prepares codebases for security review using Trail of Bits' checklist. Helps set review goals, runs static analysis tools,…

@trailofbits@trailofbitsInstall Skill
code-maturity-assessor

code-maturity-assessor

Systematic code maturity assessment using Trail of Bits' 9-category framework. Analyzes codebase for arithmetic safety, auditing…

@trailofbits@trailofbitsInstall Skill

More skills from other plugins.

api-security

api-security

Use for authorized security assessment of REST, GraphQL, WebSocket, or SOAP APIs, including discovery, authentication,…

@zhaoxuya520@zhaoxuya520Install Skill
nemoclaw-user-guide

nemoclaw-user-guide

Find official NemoClaw documentation for installation, configuration, operation, or troubleshooting. Also handles requested docs…

nemoclaw11d23k
@nvidia@nvidiaInstall Skill

Questions about audit-context-building.

Which coding agents can use audit-context-building?
audit-context-building installs in Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode and Windsurf with the skills CLI, using each agent's flag shown on this page. Flowy's auto-invocation, which fires a skill when your prompt matches, runs in Claude Code only.