A tool that turns source code and compiled programs into graphs showing how functions, types, references, and data flows connect. It uses those graphs to support security analysis and create focused source packets.

It is for mapping attack surfaces, tracing tainted data, finding entry points and unresolved calls, locating complex areas, estimating blast radius, and comparing code structure.

It helps security reviewers understand large or unfamiliar codebases and see how a vulnerability or entry point could affect other parts of a program.

trailmark — Plugin for Claude Code by trailofbits

About the project

Trail of Bits Skills Marketplace is a collection of Claude Code plugins, skills, agents, commands, and instructions for security analysis, vulnerability detection, code auditing, and development workflows. It is for developers and security researchers using AI-assisted tools to inspect software, smart contracts, CI workflows, and related artifacts. The catalogue entries are examples of the marketplace’s reusable agent extensions.

trailofbits/skills · 6,988 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/trailofbits/skills

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/trailofbits/skills/trailmark.svg)](https://agentmods.dev/plugins/trailofbits/skills/trailmark)

Your own site

<a href="https://agentmods.dev/plugins/trailofbits/skills/trailmark"><img src="https://agentmods.dev/badge/plugins/trailofbits/skills/trailmark.svg" alt="Measured on agentmods" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured The manifest loads nothing itself; its 11 skills, 1 agent cost 1,056 tokens a session between them.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Security

Grade A, and why

trailmark scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/trailmark/.claude-plugin/plugin.json · 10 lines

The source is not reproduced here

Licensed CC-BY-SA-4.0

The repository is licensed CC-BY-SA-4.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Contents

What it installs

The manifest is a name and a version. 11 skills, 1 agent travel with it, and installing the plugin installs all of them — 1,056 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

4d ago First seen · 10 lines scan A 06ec9a3da662

Subscribe to this mod's changes

trailmark is a plugin published in the GitHub repository trailofbits/skills (6,988 stars, last pushed 4d ago), licensed CC-BY-SA-4.0. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Code review Security agent-skills

han-communication

Foundational communication plugin for the Han suite. Owns the canonical readability standard, the writing-voice profile, and the explanation standard for talking to a reader who will not implement the work, plus the readability-guidance skill that surfaces the first two into a calling skill's own context for in-voice…

testdouble/han · not measured

git-pr

Committing, PR creation and review triage, and dependency upgrades.

Casper-Studios/casper-marketplace · not measured

peer-review

Cross-model peer review of plans, specs, and the decisions a session has just made: a harness-agnostic deliberation protocol (challenge packet with GIVEN-tagged context, challenger findings that each carry their own falsifier, evidence-backed responses at a stable locator, a verbatim ledger, a certification pass the…

acaprino/daodan · not measured

trailmark