What is codebase-analysis?

A codebase mapper that examines a project folder by folder and represents its contents and relationships as JSON. A knowledge graph is structured data showing things and the connections between them.

Use it to create machine-readable maps of files, components, and their relationships.

It turns a large, unfamiliar project into structured information that can be inspected or processed by other tools.

How ran729/context-rot-skill configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to ran729/context-rot-skill. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/ran729/context-rot-skill/main/.claude/.claude/skills/codebase-analysis/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/ran729/context-rot-skill

Made for: Claude Code.

Or install context-rot, the plugin that ships this one along with the rest of its 8 skills.

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/skills/ran729/context-rot-skill/codebase-analysis/github.svg)](https://agentmods.dev/skills/ran729/context-rot-skill/codebase-analysis)

Your own site

<a href="https://agentmods.dev/skills/ran729/context-rot-skill/codebase-analysis"><img src="https://agentmods.dev/badge/skills/ran729/context-rot-skill/codebase-analysis/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/ran729/context-rot-skill/codebase-analysis"><img src="https://agentmods.dev/badge/skills/ran729/context-rot-skill/codebase-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,227 The whole file, excluding the scripts and references it only reads on demand.

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.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00023	$0.04227
Opus 5.5	$0.00009	$0.01691
Sonnet 5.5	$0.00005	$0.00845
Haiku 4.5	$0.00002	$0.00423

Measured 2mo ago against content hash 73f57638781b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

codebase-analysis 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/validate_schema.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.claude/.claude/skills/codebase-analysis/SKILL.md · 430 lines

The source is not reproduced here

No licence file

Read it on GitHub

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2mo ago First seen · 430 lines · 23 tokens per session scan A 73f57638781b

Subscribe to this mod's changes

codebase-analysis is a skill published in the GitHub repository ran729/context-rot-skill (2 stars, last pushed 8mo ago), with no licence file. It adds 23 tokens to every session and 4,227 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-31.

codebase-analysis next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
codebase-analysisran729/context-rot-skill	Skill	2	8mo ago	none	A	23	Claude Code
imagegenopenai/codex	Skill	134k	today	Apache-2.0	A	113	Codex
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	today	MIT	A	200	Claude Code, Codex
playwright-climicrosoft/playwright	Skill	99k	today	Apache-2.0	A	19	Claude Code
systematic-debuggingobra/superpowers	Skill	314k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	today	MIT	A	95	Claude Code
chat-pet-sprite-creationmicrosoft/vscode	Skill	195k	today	MIT	A	53	Claude Code, Codex

context-rot-skill: Skill for Claude Code