A codebase-understanding plugin helps an agent study how a software project is organized and how its code works. It can examine patterns, dependencies, execution paths, and the possible effects of changes.

Use it to explore architecture, trace code flows, learn recurring design patterns, inspect change impact, and use repository history during code analysis.

It reduces the time needed to understand unfamiliar code and helps identify what else may be affected before editing a project.

sourceatlas — Plugin by lis186

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.

Claude Code

/plugin marketplace add lis186/SourceAtlas

agentmods

npx agentmods add plugins/lis186/sourceatlas/plugin

Clone the repo

git clone --depth 1 https://github.com/lis186/SourceAtlas

Made for: Claude Code.

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

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

sourceatlas 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 yesterday.

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.

plugin/.claude-plugin/plugin.json · 20 lines

What it actually says

{
  "name": "sourceatlas",
  "description": "AI-powered codebase understanding assistant. Learn design patterns, analyze impact, trace code flows, and understand any codebase through information theory principles. Includes 6 Agent Skills for automatic analysis triggering.",
  "version": "2.13.1",
  "author": {
    "name": "Justin Lee"
  },
  "repository": "https://github.com/lis186/SourceAtlas",
  "keywords": [
    "codebase-analysis",
    "pattern-learning",
    "impact-analysis",
    "code-flow",
    "git-history",
    "code-understanding",
    "architecture"
  ],
  "license": "MIT"
}

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.

yesterday First seen · 20 lines scan A 7dd35aeeee59

Subscribe to this mod's changes

sourceatlas is a plugin published in the GitHub repository lis186/SourceAtlas (46 stars, last pushed 1mo ago), licensed MIT. 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 2026-08-30.

Planning

sourceatlas

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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