map-codebase

map-codebase is a command for Claude Code from jszmajda/lid. It costs 65 tokens per session (151 once invoked), scanned A, original, MIT.

A guided analysis of an existing codebase, often called a brownfield project because development has already started. It groups the code by different viewpoints and creates starting documents that describe the system and its requirements.

In plain words
What is it for?
Use it to map the files in a repository, reconcile proposed groupings, and start high-level and low-level design documents. It also prepares an arrow overlay and a follow-up step for completing the documents.
Why use it?
It helps when a project is unfamiliar or its structure is not documented. The process turns a large codebase into organized areas that can be reviewed and described.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions CLAUDE.md; mentions subagents.

Part of the arrow-maintenance plugin — 2 skills, 2 commands shipped together

Good fit Use it to map the files in a repository, reconcile proposed groupings, and start high-level and low-level design documents. It also prepares an arrow overlay and a follow-up step for completing the documents.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/jszmajda/lid/map-codebase
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/jszmajda/lid

Made for: Claude Code.

Or install arrow-maintenance, the plugin that ships this one along with the rest of its 2 skills, 2 commands.

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/commands/jszmajda/lid/map-codebase/github.svg)](https://agentmods.dev/commands/jszmajda/lid/map-codebase)
Your own site
<a href="https://agentmods.dev/commands/jszmajda/lid/map-codebase"><img src="https://agentmods.dev/badge/commands/jszmajda/lid/map-codebase/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 map-codebase

Your own site · 80×15
<a href="https://agentmods.dev/commands/jszmajda/lid/map-codebase"><img src="https://agentmods.dev/badge/commands/jszmajda/lid/map-codebase.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 65 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 151 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 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 5.1 $0.00065 $0.00151
Opus 5.5 $0.00026 $0.00060
Sonnet 5.5 $0.00013 $0.00030
Haiku 4.5 $0.00006 $0.00015

Measured 1mo ago against content hash 02b2e7a8ac7e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo 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/arrow-maintenance/commands/map-codebase.md · 7 lines

What it actually says

Invoke the map-codebase skill. Warns upfront about token intensity; asks the user for scope and optional subagent parallelism; runs a six-phase flow ending in /update-lid (terminal CLAUDE.md configuration) + a flesh-out prompt. See plugins/arrow-maintenance/skills/map-codebase/SKILL.md for the full behavior and Five Critical Rules.

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. 1mo ago First seen · 7 lines · 65 tokens per session scan A 02b2e7a8ac7e

Subscribe to this mod's changes

map-codebase is a command published in the GitHub repository jszmajda/lid (112 stars, last pushed 3d ago), licensed MIT. It adds 65 tokens to every session and 151 once invoked, about $0.0003 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 2026-08-30.