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pm-brain CLAUDE.md

pm-brain CLAUDE.md is an instructions file for coding agents from phuryn/pm-brain. It costs 1,833 tokens per session, scanned A, original, MIT.

Repository instructions for PM Brain, a skill that helps product managers organize and use a structured collection of product information. The repository contains the skill, an example brain, documentation, and tests.

In plain words
What is it for?
Use them when changing the PM Brain skill, its example workspace, its documentation, or its evaluation scenarios.
Why use it?
They clarify which files serve users, evaluators, and contributors, reducing the risk of editing the example data or tests when the actual skill is intended.

Instructions file

not rated 543 +2 3mo ago A scan 1,833 tokens original MIT
View the source file phuryn/pm-brain
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 instructions/phuryn/pm-brain/claude-md
Clone the repo
git clone --depth 1 https://github.com/phuryn/pm-brain

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 pm-brain CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/phuryn/pm-brain/claude-md.svg)](https://agentmods.dev/instructions/phuryn/pm-brain/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/phuryn/pm-brain/claude-md"><img src="https://agentmods.dev/badge/instructions/phuryn/pm-brain/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 1,833 This file is loaded in full into every session.
When invoked 1,833 The same file — it is already loaded in full.
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 $0.01833 $0.01833
Opus 5 $0.00916 $0.00916
Sonnet 5 $0.00367 $0.00367
Haiku 4.5 $0.00183 $0.00183

Measured 4d ago against content hash 722d882dd3c4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

pm-brain CLAUDE.md 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 4d 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.

CLAUDE.md · 115 lines

How it starts

The opening of the file, as written. The whole thing — 115 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — PM Brain repo

This is the canonical repo for the PM Brain Claude Code skill. It contains the skill itself, a pre-scaffolded example brain, an eval suite of synthetic scenarios, and architectural docs.

What this repo is for

Three audiences, three uses:

  1. PMs installing the skill — copy .claude/skills/pm-brain/ into ~/.claude/skills/, run /pm-brain in any working directory. Read README.md and docs/how-it-works.md.
  2. People evaluating whether PM Brain is right for them — browse example-brain/ to see what a populated PM Brain looks like. Read docs/architecture.md.
  3. Contributors and testers — run the eval suite under tests/. Add scenarios. Tighten ground-truth assertions. Surface failure modes.

This CLAUDE.md is the repo-level operating manual. It tells Claude (or any agent working in this repo) how the pieces relate and what work patterns are valid here.

It is NOT the brain's own operating manual. The brain has its own CLAUDE.md inside example-brain/CLAUDE.md and inside any working directory the skill is invoked in.

Repo structure

.claude/skills/pm-brain/    # Canonical skill (SKILL.md + scaffold/ + prompts/)
example-brain/              # Pre-scaffolded instance. Browseable, edit-safe.
tests/                      # Eval suite
├── scenarios/              # Synthetic PM scenarios with ground truth
└── harness/                # Runner + structural checks + LLM-judge rubrics
docs/                       # Architecture, how it works, testing, prior art
README.md                   # Public-facing
CLAUDE.md                   # This file

Working in this repo

When asked to modify the skill

The skill at .claude/skills/pm-brain/ is the source of truth. Two layers:

  • scaffold/ — deterministic. Schemas, CLAUDE.md template, INDEX template, folder tree. Same every install.
  • prompts/ — adaptive. Mode detection, migration, interview, post-scaffold self-test. Loaded per phase.

When changing the skill:

  1. If the change is structural (new file, new schema field) → edit scaffold/.
  2. If the change is behavioral (better interview, sharper contradiction detection) → edit prompts/ or SKILL.md.
  3. Mirror structural scaffold changes into example-brain/ if the example needs to stay current.
  4. Run the eval suite (tests/harness/run_all.py) to confirm scenarios still pass at expected rates.

Read the full file on GitHub · 115 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. 4d ago First seen · 115 lines · 1,833 tokens per session scan A 722d882dd3c4

Subscribe to this mod's changes

pm-brain CLAUDE.md is an instructions file published in the GitHub repository phuryn/pm-brain (543 stars, last pushed 3mo ago), licensed MIT. It adds 1,833 tokens to every session, about $0.0092 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 2026-08-30.

Project managementclaude-codesecond-brain
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