gsd-map-codebase

gsd-map-codebase is a command for Claude Code from mrmyothet/zach-hair-studio. It costs 21 tokens per session (877 once invoked), scanned A, original, MIT.

A codebase-mapping command that uses several mapper agents to inspect a project and write structured findings into `.planning/codebase/`. It can scan the whole project, focus on an area, or answer queries about the existing map.

In plain words
What is it for?
It is for creating or refreshing seven codebase documents, preparing an existing project for planning, and querying the stored codebase information.
Why use it?
It gives developers a shared picture of an unfamiliar or changing codebase before they plan more work. This is especially useful when documentation is incomplete or the project already contains substantial code.

Command for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

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 commands/mrmyothet/zach-hair-studio/gsd-map-codebase
Clone the repo
git clone --depth 1 https://github.com/mrmyothet/zach-hair-studio

Made for: Claude Code.

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 gsd-map-codebase

README.md
[![agentmods](https://agentmods.dev/badge/commands/mrmyothet/zach-hair-studio/gsd-map-codebase.svg)](https://agentmods.dev/commands/mrmyothet/zach-hair-studio/gsd-map-codebase)
Your own site
<a href="https://agentmods.dev/commands/mrmyothet/zach-hair-studio/gsd-map-codebase"><img src="https://agentmods.dev/badge/commands/mrmyothet/zach-hair-studio/gsd-map-codebase.svg" alt="Measured on agentmods" height="20"></a>
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 877 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 5.1 $0.00021 $0.00877
Opus 5 $0.00010 $0.00439
Sonnet 5 $0.00004 $0.00175
Haiku 4.5 $0.00002 $0.00088

Measured 2d ago against content hash fac391851e5d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

gsd-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 2d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

landing-page/.claude/commands/gsd-map-codebase.md · 84 lines

What it actually says

Each mapper agent explores a focus area and writes documents directly to .planning/codebase/. The orchestrator only receives confirmations, keeping context usage minimal.

Output: .planning/codebase/ folder with 7 structured documents about the codebase state.

<execution_context> @/home/myothet/repos/vct/zach-hair-studio/landing-page/.claude/gsd-core/workflows/map-codebase.md </execution_context>

Parse the first token of $ARGUMENTS:

  • If it is --fast: strip the flag, run the scan workflow (passing remaining args including optional --focus).
  • If it is --query: strip the flag, run the intel workflow (passing remaining args as the subcommand).
  • Otherwise: pass all of $ARGUMENTS as focus area to the map-codebase workflow.

Load project state if exists: Check for .planning/STATE.md - loads context if project already initialized

This command can run:

  • Before /gsd-new-project (brownfield codebases) - creates codebase map first
  • After /gsd-new-project (greenfield codebases) - updates codebase map as code evolves
  • Anytime to refresh codebase understanding

<when_to_use> Use map-codebase for:

  • Brownfield projects before initialization (understand existing code first)
  • Refreshing codebase map after significant changes
  • Onboarding to an unfamiliar codebase
  • Before major refactoring (understand current state)
  • When STATE.md references outdated codebase info

Skip map-codebase for:

  • Greenfield projects with no code yet (nothing to map)
  • Trivial codebases (<5 files) </when_to_use>

<success_criteria>

  • .planning/codebase/ directory created
  • All 7 codebase documents written by mapper agents
  • Documents follow template structure
  • Parallel agents completed without errors
  • User knows next steps </success_criteria>
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. 2d ago First seen · 84 lines · 21 tokens per session scan A fac391851e5d

Subscribe to this mod's changes

gsd-map-codebase is a command published in the GitHub repository mrmyothet/zach-hair-studio (11 stars, last pushed 21d ago), licensed MIT. It adds 21 tokens to every session and 877 once invoked, about $0.0001 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 2026-09-03.