Borrowing it
Nothing to install: this file belongs to mishahanin/heading-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mishahanin/heading-os/main/CLAUDE.mdgit clone --depth 1 https://github.com/mishahanin/heading-osWrote 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.
[](https://agentmods.dev/instructions/mishahanin/heading-os/claude-md)<a href="https://agentmods.dev/instructions/mishahanin/heading-os/claude-md"><img src="https://agentmods.dev/badge/instructions/mishahanin/heading-os/claude-md/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.
<a href="https://agentmods.dev/instructions/mishahanin/heading-os/claude-md"><img src="https://agentmods.dev/badge/instructions/mishahanin/heading-os/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.03229 | $0.03229 |
| Opus 5.5 | $0.01292 | $0.01292 |
| Sonnet 5.5 | $0.00646 | $0.00646 |
| Haiku 4.5 | $0.00323 | $0.00323 |
Grade A, and why
heading-os 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 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.
How it starts
The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md — HEADING OS Engine
HEADING OS is an operations engine for an AI executive assistant: a library of skills, always-on rules, automation scripts, and daemons that let Claude Code act as a strategic assistant across sessions. This repository is the engine — code only, no private data. It is a personal project built and maintained by Misha Hanin and shared as an open framework. Misha is the Founder & CEO of 31 Concept (31C) and uses HEADING OS himself, but 31 Concept is not involved in it and bears no responsibility for it; any 31C-like vocabulary here is illustrative example data only.
Engine / data separation
The engine never contains real data, secrets, or PII. Anything
operator-specific — contacts, knowledge, outputs, threads, real identities,
credentials — lives outside this repo: in a separate private data overlay and in
gitignored runtime files (.env, .sessions). Routing is declared in
config/routing-map.yaml and enforced by scripts/leak-guard.py,
scripts/utils/engine_guard.py, and the unbypassable push-time content scan in
scripts/push-all.py.
If you run this as your own operator workspace, your private operational notes
load from a local overlay via the import at the bottom of this file; on a public
clone that overlay is simply absent and the engine runs on its defaults and
*.example.* templates.
Layout
.claude/skills/— skills (one folder per skill:SKILL.md, optionalreferences/,triggers.json).claude/rules/— always-on and path-scoped behavioral rulesscripts/— CLI utilities and daemons; shared modules inscripts/utils/tests/— pytest suiteconfig/— engine configuration (real instance values stay private); the*.example.*per-instance templates live beside the scripts that read them, inscripts/docs/,reference/,examples/— documentation and scaffolding
Setup
Canonical toolchain is uv; pyproject.toml is the source of truth and uv.lock
pins the resolved set.
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.
- 1mo ago Changed · +27 lines · +401 tokens per session 6b8c6afab888
- 1mo ago Changed · -15 lines · -249 tokens per session scan C → A c64e436deaaa
- 1mo ago Changed 70cf0334dd98
- 1mo ago Changed · +31 lines · +623 tokens per session 850244147bb3
- 1mo ago Changed · +39 lines · +591 tokens per session 2f737ffc5974
- 1mo ago First seen · 141 lines · 1,863 tokens per session scan C e60d2756ef74
heading-os CLAUDE.md is an instructions file published in the GitHub repository mishahanin/heading-os (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 3,229 tokens to every session, about $0.0129 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 2026-09-03.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.