map-codebase

map-codebase is a skill for Claude Code, Codex from dorayo/orchestrix-skills. It costs 36 tokens per session (886 once invoked), scanned A, original, MIT.

A guided investigation of an existing codebase before making changes, documenting its structure, real execution paths, conventions, and risks.

In plain words
What is it for?
Use it when joining or modifying an existing project to trace important flows, inspect configuration and tests, record coding conventions, and mark files that should not be edited.
Why use it?
It reduces the chance of changing the wrong layer, duplicating existing code, or overlooking migrations, generated files, global state, or missing tests.

Skill for Claude CodeCodex

Part of the orchestrix-skills plugin — 15 skills shipped together

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.

agentmods
npx agentmods add skills/dorayo/orchestrix-skills/map-codebase
Any agent
npx skills add dorayo/orchestrix-skills --skill map-codebase
Clone the repo
git clone --depth 1 https://github.com/dorayo/orchestrix-skills

Made for: Claude Code, Codex.

Or install orchestrix-skills, the plugin that ships this one along with the rest of its 15 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.

agentmods badge for map-codebase

README.md
[![agentmods](https://agentmods.dev/badge/skills/dorayo/orchestrix-skills/map-codebase.svg)](https://agentmods.dev/skills/dorayo/orchestrix-skills/map-codebase)
Your own site
<a href="https://agentmods.dev/skills/dorayo/orchestrix-skills/map-codebase"><img src="https://agentmods.dev/badge/skills/dorayo/orchestrix-skills/map-codebase.svg" alt="Measured on agentmods" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 886 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00036 $0.00886
Opus 5 $0.00018 $0.00443
Sonnet 5 $0.00007 $0.00177
Haiku 4.5 $0.00004 $0.00089

Measured 3d ago against content hash cd9152f91c95, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

map-codebase 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 3d 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.

skills/map-codebase/SKILL.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Map Codebase (Brownfield Entry)

Greenfield runs start from intent; brownfield runs start from SOMEONE ELSE'S decisions. Changing code you haven't mapped produces changes that fight the codebase — wrong layer, wrong convention, duplicated machinery.

Core principle: The map comes from reading code, not from directory names or the README. A README describes what the project wishes it were; git log and the source describe what it is.

Process

  1. Inventory. Layout, manifests (package.json/pyproject/go.mod…), scripts, CI config, generated/vendored dirs (mark them DO-NOT-EDIT).
  2. Trace one or two REAL flows end to end (guided by focus if given): entry point → routing/dispatch → business logic → persistence/IO. Read the actual files; record the chain as file:symbol → file:symbol. This step is what separates a map from a guess.
  3. Extract conventions from evidence — for each, cite the example file you derived it from: naming, module boundaries, error handling style, test location and framework, how config/env is read, commit message style.
  4. Hazards. Migrations and how they run; generated code and what generates it; global state; areas with no test coverage; anything git log shows as churn-heavy (bug-prone) or untouched-for-years (fragile assumptions).
  5. Write back to the registry/* namespace (physical path from core-config.yaml; default knowledge/registry/) following the metabolism governance in orchestrate (read-before-write, update-don't-append, facts only):
    • registry/architecture.md — the traced structure
    • registry/conventions.md — the evidenced conventions Registry holds FACTS about this codebase. Opinions and preferences belong in taste/*, and only via a human correction — not from this skill.

Output: codebase_map

# Codebase map — <repo> @ <commit>

## Shape — <stack, top-level layout, one paragraph>
## Traced flows
- <flow>: entry `a.ts:handler` → `b.ts:service` → `c.ts:repo` → <storage>
## Conventions (evidence-cited)
- <convention> — see <file>
## Hazards
- <hazard> — <why it bites> — <file/dir>
## Where a change like "<focus>" belongs — <layer/files>, following <convention>

Read the full file on GitHub · 81 lines

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. 3d ago First seen · 81 lines · 36 tokens per session scan A cd9152f91c95

Subscribe to this mod's changes

map-codebase is a skill published in the GitHub repository dorayo/orchestrix-skills (2 stars, last pushed 3d ago), licensed MIT. It adds 36 tokens to every session and 886 once invoked, about $0.0002 per session on Opus 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.

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