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har: Instructions file for Codex

AGENTS.md

har AGENTS.md is an instructions file for Codex, OpenCode from os-factory/har. It costs 4,798 tokens per session, scanned A, original, Apache-2.0.

Project instructions for coding agents working on HAR, a command-line and control system for running and checking development environments.

In plain words
What is it for?
Use them when editing HAR, starting live apps or browsers, taking screenshots, running full verification, and preparing a session handoff.
Why use it?
They define how to launch isolated work areas, run verification, and hand off changes without bypassing the repository's checks.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md; mentions Cursor.

This is os-factory/har's own configuration. It tells Codex and OpenCode how to work on har itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything har configures →

not rated 129repo +1 3d ago A scan 4,798 tokens original Apache-2.0
View source ↗ os-factory/har harproject.dev
Reuse

Borrowing it

Nothing to install: this file belongs to os-factory/har. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/os-factory/har/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/os-factory/har

Made for: Codex, OpenCode.

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.

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README.md
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Your own site
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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.

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Per session 4,798 This file is loaded in full into every session.
When invoked 4,798 The same file — it is already loaded in full.
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 $0.04798 $0.04798
Opus 5.5 $0.01919 $0.01919
Sonnet 5.5 $0.00960 $0.00960
Haiku 4.5 $0.00480 $0.00480

Measured 2mo ago against content hash 9bf626372db7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

har 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 2mo 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.

AGENTS.md · 292 lines

How it starts

The opening of the file, as written. The whole thing — 292 lines — stays where its author put it; the contents beside it link to each section on GitHub.

HAR — Agent Development Guide

Guide for coding agents working on this repository (@osfactory/har — the CLI and MCP control plane).

For setup, testing fixtures, and PR workflow, see CONTRIBUTING.md.

This repo dogfoods HAR — .har/ at the repo root defines how coding agents validate changes here.

HAR / agent environment

This repository uses a .har/ harness. It is how you run and verify this project — launch a slot for live apps, browsers and screenshots; never hand-roll docker or dev-server startup. If a harness command fails, fix the harness or report it; do not fall back to ad-hoc commands.

  1. Launch first — har_launch_environment / har env launch <id>. Make ALL edits under the returned work dir, never the main checkout. Bind tracker work with --work-id / --work-url when the task names an issue.
  2. Verify before done — har_run_verification (full: true) / har env verify <id> --full. Commit in the session worktree.
  3. Stop at handoff — report summary, session branch and preview URLs, then wait. Never autonomously complete, teardown, push, or open a PR.

Occupied slots always block: complete / teardown, then launch. Customize the harness only through harness.env, stages.json + .har/stages/, .har/hooks/ and .har/plugins/ — there is no generated .har/*.sh entry-point surface.

Full detail — slot environment, readiness, definition of done, project commands, commit gate: .har/README.md and .har/stages.json.

Harnesses in this repo

This is a monorepo with three harnesses — pick the one that owns the files you are changing:

Path Profile Runs Use when changing Docs
.har/ cli @osfactory/har (typecheck, build, unit tests, lint) src/, packages/, tests/ .har/README.md
control/.har/ default Mission Control (Next.js + SQLite, browser-e2e) control/ control/.har/README.md
docs/.har/ default Docs / marketing site (Astro + Playwright screenshots) docs/ docs/.har/README.md

Read the full file on GitHub · 292 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. 2mo ago First seen · 292 lines · 4,798 tokens per session scan A 9bf626372db7

Subscribe to this mod's changes

har AGENTS.md is an instructions file published in the GitHub repository os-factory/har (129 stars, last pushed 3d ago), licensed Apache-2.0. It adds 4,798 tokens to every session, about $0.0192 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.

ai-agentsai-codingai-toolsharnessharness-engineeringsoftware-factory
Related

har AGENTS.md compared with instructions from other repositories

har AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
har AGENTS.mdos-factory/harInstructions file1293d agoApache-2.0A4,798Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode