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.
npx agentmods add instructions/phuryn/pm-brain/agents-mdgit clone --depth 1 https://github.com/phuryn/pm-brainWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00150 | $0.00150 |
| Opus 5 | $0.00075 | $0.00075 |
| Sonnet 5 | $0.00030 | $0.00030 |
| Haiku 4.5 | $0.00015 | $0.00015 |
Grade A, and why
pm-brain AGENTS.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 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.
What it actually says
For agents
If you are Claude (Claude Code, Claude Desktop, Claude in the API): read CLAUDE.md.
If you are a different agent (Cursor, Codex, Aider, GitHub Copilot, others): start with README.md. The brain itself is a folder of markdown files plus one CLAUDE.md in the working directory. Any agent that can read a project-root CLAUDE.md can run the brain. The canonical skill lives at .claude/skills/pm-brain/ for environments that support the SKILL.md format.
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.
- 3d ago First seen · 6 lines · 150 tokens per session scan A d06091ce18a1
pm-brain AGENTS.md is an instructions file published in the GitHub repository phuryn/pm-brain (537 stars, last pushed 3mo ago), licensed MIT. It adds 150 tokens to every session, about $0.0007 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.
Other instructions, from other repositories
claude-obsidian GEMINI.md
Gemini CLI instructions for AgriciDaniel/claude-obsidian: Read AGENTS.md as the canonical host-neutral contract. Skills live in skills/ /SKILL.md and the portable core lives in claudeobsidian/.
kenjaku CLAUDE.md
Instructions for tpierrain/kenjaku, covering step 1 — get the launcher (normal clone), step 2 — ask the questions in chat (grouped), step 3 — run the exact command (copy it, do not paraphrase), step 4 — relay the result + 5 final instructions and guardrails (never to be breached).
second-brain-starter-kit AGENTS.md
AGENTS.md instructions for tonydzi/second-brain-starter-kit, covering agents.md — working in this repo, what this repo is, layout, how to verify a change and conventions.
thebrain-mcp CLAUDE.md
Instructions for yBookoff/thebrain-mcp, covering thebrain-mcp — working notes for claude, invariants, layout, api gotchas that keep biting and semantic layer.
VLM-wiki AGENTS.md
Instructions for VeniVeci/VLM-wiki, covering vlm wiki agent, core philosophy, architecture, special files and model configuration.
cerebellum CLAUDE.md
Instructions for jj-valentine/cerebellum, covering cerebellum, what this is, stack, commands and key files.