Borrowing it
Nothing to install: this file belongs to LuisFelipeMoro/Harness-devkit. 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/LuisFelipeMoro/Harness-devkit/main/AGENTS.mdgit clone --depth 1 https://github.com/LuisFelipeMoro/Harness-devkitWrote 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/luisfelipemoro/harness-devkit/agents-md)<a href="https://agentmods.dev/instructions/luisfelipemoro/harness-devkit/agents-md"><img src="https://agentmods.dev/badge/instructions/luisfelipemoro/harness-devkit/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.
<a href="https://agentmods.dev/instructions/luisfelipemoro/harness-devkit/agents-md"><img src="https://agentmods.dev/badge/instructions/luisfelipemoro/harness-devkit/agents-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 | $0.00602 | $0.00602 |
| Opus 5.5 | $0.00241 | $0.00241 |
| Sonnet 5.5 | $0.00120 | $0.00120 |
| Haiku 4.5 | $0.00060 | $0.00060 |
Grade A, and why
Harness-devkit 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 14d 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 — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.
claude-devkit — Agent Instructions
This repo is the claude-devkit — a multi-plugin skill/agent library originally built for Claude Code. If you are Codex CLI, or another harness reading this file, working in this repo: the canonical engineering standards live in a single place to avoid drift —
Read plugins/coding-pipeline/CLAUDE.md before making any change. It covers coding discipline,
quality gates, security defaults, and per-language rules that apply regardless of which
harness you are.
Two conventions there are easy to get wrong and worth calling out up front:
- Tests are written after the implementation, against a spec frozen before it — then falsified (break the code path, confirm the test fails on its own assertion, restore). Not TDD. A tautological or unfalsified test blocks handoff regardless of coverage. The one exception is a bug fix, which keeps its RED reproduction test.
- Branching: work on the current branch; on
main/mastercutfeat/{slug}first, never commit tomain, and never push or open a PR unless asked. Seeplugins/coding-pipeline/references/branching.md. - Skills are manual: every skill is started by the user and does one job; none runs another.
Harness-specific notes
- Skills (
plugins/*/skills/*/SKILL.md) use onlyname:/description:(plusdisable-model-invocation: true, which Codex ignores) frontmatter — this is the same shape Codex's own Skills convention expects, so they are directly usable once placed under a.agents/skills/directory Codex scans (repo, user, or system level). Seeplugins/coding-pipeline/scripts/install-codex.shto install them for Codex. - Agents (
plugins/coding-pipeline/agents/*.md) are Claude Code Task-tool subagent definitions (tools:/model:frontmatter, dispatched by name from skills). Codex has its own declarative subagent format (~/.codex/agents/<name>.toml) — runplugins/coding-pipeline/scripts/generate-codex-agents.shto generate one per agent, with reasoning effort mapped from the Claudemodel:tier. Seeplugins/coding-pipeline/codex/harness-adapter.mdfor the current mapping and known gaps (pipeline sequencing is not yet validated in a live Codex session). - Git hooks (
plugins/coding-pipeline/git-hooks/) are plain POSIX shell and work under any harness or none at all — install viabash plugins/coding-pipeline/scripts/install-git-hooks.sh.
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.
- 14d ago Changed · +16 tokens per session a7a4be355372
- 2mo ago First seen · 37 lines · 586 tokens per session scan A 642f14b9ce55
Harness-devkit AGENTS.md is an instructions file published in the GitHub repository LuisFelipeMoro/Harness-devkit (13 stars, last pushed 3d ago), licensed MIT. It adds 602 tokens to every session, about $0.0024 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.
Harness-devkit AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| Harness-devkit AGENTS.mdLuisFelipeMoro/Harness-devkit | Instructions file | 13 | 3d ago | MIT | A | 602 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | today | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,516 | GitHub Copilot |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | today | MIT | A | 4,680 | Codex, OpenCode |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 3,093 | GitHub Copilot |
| vscode ai-customization.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 1,907 | GitHub Copilot |