harness-starter-pack: Instructions file for Codex

AGENTS.md

harness-starter-pack AGENTS.md is an instructions file for Codex, OpenCode from kingassune/harness-starter-pack. It costs 770 tokens per session, scanned A, original, CC0-1.0.

A project instruction file named AGENTS.md for the Harness Starter Pack. It tells an agent what the project is, how to plan and record work, and which commands and conventions to follow.

In plain words
What is it for?
For projects that want agents to follow a documented plan-and-verify loop and keep implementation notes up to date.
Why use it?
It gives agents a repeatable workflow: read the plan, make a small change, verify it, and record decisions.

Instructions file for CodexOpenCode

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

This is kingassune/harness-starter-pack's own configuration. It tells Codex and OpenCode how to work on harness-starter-pack 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 harness-starter-pack configures →

Reuse

Borrowing it

Nothing to install: this file belongs to kingassune/harness-starter-pack. 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/kingassune/harness-starter-pack/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/kingassune/harness-starter-pack

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.

agentmods badge for harness-starter-pack AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/kingassune/harness-starter-pack/agents-md/github.svg)](https://agentmods.dev/instructions/kingassune/harness-starter-pack/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/kingassune/harness-starter-pack/agents-md"><img src="https://agentmods.dev/badge/instructions/kingassune/harness-starter-pack/agents-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.

agentmods 80×15 button for harness-starter-pack AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/kingassune/harness-starter-pack/agents-md"><img src="https://agentmods.dev/badge/instructions/kingassune/harness-starter-pack/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 770 This file is loaded in full into every session.
When invoked 770 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 $0.00770 $0.00770
Opus 5.5 $0.00308 $0.00308
Sonnet 5.5 $0.00154 $0.00154
Haiku 4.5 $0.00077 $0.00077

Measured 2mo ago against content hash fed982b9aaa0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

harness-starter-pack 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 · 84 lines

How it starts

The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Project-level operating instructions for any AI agent working in this repo. Keep this file SHORT, STABLE, and HIGH-SIGNAL. It is loaded into the system prompt and survives context compaction — so put the rules here that must never be forgotten, not things the agent can discover by reading code.

Rule of thumb: if losing a line mid-task would cause a bug, it belongs here. If the agent could figure it out from the codebase, leave it out.


1. What this project is

  • Product:
  • Primary language / runtime:
  • Package manager:
  • Where the entrypoint lives:

2. How to work here (the loop)

The agent must follow this cycle on every task:

  1. Read PLAN.md (if present) before doing anything. If absent, create one.
  2. Plan — write/update milestones in PLAN.md before writing code.
  3. Act — make the smallest change that advances the current milestone.
  4. Verify — run the verification command below after every change.
  5. Record — append decisions and deviations to IMPLEMENT.md.
  6. Repeat until all milestones are [x].

3. Commands

Action Command
Install deps …
Run / dev server …
Verify (tests) … ← run after every change
Lint / format …
Typecheck …
Build …

Verification is mandatory. A change is not complete until the verify command passes. Emit only summary lines to context; log full output to a file.

4. Conventions

  • Code style:
  • Naming:
  • File layout / where things go:
  • Tests live in:
  • Commit message format:
  • Do NOT touch:

Read the full file on GitHub · 84 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 · 84 lines · 770 tokens per session scan A fed982b9aaa0

Subscribe to this mod's changes

harness-starter-pack AGENTS.md is an instructions file published in the GitHub repository kingassune/harness-starter-pack (2 stars, last pushed 4mo ago), licensed CC0-1.0. It adds 770 tokens to every session, about $0.0031 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 2026-08-31.

Related

harness-starter-pack AGENTS.md compared with instructions from other repositories

harness-starter-pack AGENTS.md next to 6 instructions from other repositories
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harness-starter-pack AGENTS.mdkingassune/harness-starter-packInstructions file24mo agoCC0-1.0A770Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA5,516GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchainInstructions file149ktodayMITA4,680Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file275k3d agoMITA4,313Codex, OpenCode