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codebase-mapper

codebase-mapper is a skill for Claude Code, Codex from 9thLevelSoftware/legion. It costs 63 tokens per session (21,584 once invoked), scanned B, original, no licence file.

A codebase analysis tool that documents an existing project in `CODEBASE.md` and supporting index files. These files give later planning and development steps a shared view of the project’s architecture.

In plain words
What is it for?
It helps map an existing codebase and provide architecture context to planning, building, reviewing, status, and quick-work commands.
Why use it?
It reduces the need to rediscover how an unfamiliar codebase is organized before making changes.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 82repo 1mo ago B scan 63 tokens no licence

Good fit It helps map an existing codebase and provide architecture context to planning, building, reviewing, status, and quick-work commands.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/9thlevelsoftware/legion/codebase-mapper
View source ↗ 9thLevelSoftware/legion
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.

Any agent
npx skills add 9thLevelSoftware/legion --skill codebase-mapper
Clone the repo
git clone --depth 1 https://github.com/9thLevelSoftware/legion

Made for: Claude Code, Codex.

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.

agentmods badge for codebase-mapper

README.md
[![agentmods](https://agentmods.dev/badge/skills/9thlevelsoftware/legion/codebase-mapper/github.svg)](https://agentmods.dev/skills/9thlevelsoftware/legion/codebase-mapper)
Your own site
<a href="https://agentmods.dev/skills/9thlevelsoftware/legion/codebase-mapper"><img src="https://agentmods.dev/badge/skills/9thlevelsoftware/legion/codebase-mapper/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.

agentmods 80×15 button for codebase-mapper

Your own site · 80×15
<a href="https://agentmods.dev/skills/9thlevelsoftware/legion/codebase-mapper"><img src="https://agentmods.dev/badge/skills/9thlevelsoftware/legion/codebase-mapper.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 21,584 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00063 $0.21584
Opus 5.5 $0.00025 $0.08634
Sonnet 5.5 $0.00013 $0.04317
Haiku 4.5 $0.00006 $0.02158

Measured 2mo ago against content hash f48ca816defe, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

codebase-mapper scanned grade B with 1 finding 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.

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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

1. Run `find . -type f -not -path './.git/*' -not -path './node_modules/*' -not -path './.planning/*' -not -path './.claude/*' -not -name '*.lock'` via Bash
skills/codebase-mapper/SKILL.md · 2,169 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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.

  1. 2mo ago First seen · 2,169 lines · 63 tokens per session scan B f48ca816defe

Subscribe to this mod's changes

codebase-mapper is a skill published in the GitHub repository 9thLevelSoftware/legion (82 stars, last pushed 1mo ago), with no licence file. It adds 63 tokens to every session and 21,584 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Planning
Related

codebase-mapper compared with skills from other repositories

codebase-mapper next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
codebase-mapper9thLevelSoftware/legionSkill821mo agononeB63Claude Code, Codex
imagegenopenai/codexSkill134ktodayApache-2.0A113Codex
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k2d agoMITA200Claude Code, Codex
playwright-climicrosoft/playwrightSkill100k2d agoApache-2.0A19Claude Code
browser-automationopenclaw/openclawSkill394kyesterdayMITA36Claude Code
systematic-debuggingobra/superpowersSkill315k5d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143kyesterdayMITA95Claude Code