What is MiHaCoBench AGENTS.md?

Repository instructions for MiHaCoBench, including how Codex should find project files, recognize approved workflow prompts, and follow the project's engineering rules. AGENTS.md is a file that coding agents can automatically read when started from the repository root.

Use them when working in MiHaCoBench, especially when running its prescribed workflows, resolving pack files, or following its engineering guidelines.

They keep agent work aligned with the repository's file layout and prevent special workflows from running for prompts that do not meet the stated requirements.

How HangYu8123/MiHaCoBench configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to HangYu8123/MiHaCoBench. 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/HangYu8123/MiHaCoBench/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/HangYu8123/MiHaCoBench

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/hangyu8123/mihacobench/agents-md.svg)](https://agentmods.dev/instructions/hangyu8123/mihacobench/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/hangyu8123/mihacobench/agents-md"><img src="https://agentmods.dev/badge/instructions/hangyu8123/mihacobench/agents-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,061 This file is loaded in full into every session.

When invoked 1,061 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.

Model	Per session	Once invoked
Fable 5.1	$0.01061	$0.01061
Opus 5	$0.00531	$0.00531
Sonnet 5	$0.00212	$0.00212
Haiku 4.5	$0.00106	$0.00106

Measured 7d ago against content hash 877c52091bbb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

MiHaCoBench 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 7d 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

MiHaCoBench CLAUDE.md — 86% identical, 13 lines differ

AGENTS.md · 50 lines

How it starts

The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Codex Entry Point

This file is auto-discovered by Codex when run from the repo root, including Codex CLI and Codex in VS Code. It is the Codex CLI equivalent of copilot-instructions.md.

Pack Path Resolution

Resolve all pack-relative paths in this order:

.github/HarnessFlow/<path> from the target repo root (installed layout).
<path> from the repo root (source repo / pack root layout).

Apply this rule to every path referenced in this file, workflow files, and agent definitions.

Workflow Execution

Step 0 — gate check, always first. Only a filled-in prompt from request_template/ (a mode: header block plus a numbered "Hard constraints" list naming its category's *.instructions.md) triggers a workflow. Any other prompt — even one that mentions workflows or pack files — fails the gate: skip steps 1–5 and answer it normally, with no classification, no *.instructions.md, and no contract/philosophy reads as workflow setup (the Engineering Guidelines below still apply).

For a prompt that passes the gate:

Read and follow C:/Users/Hang Yu/Desktop/MiHaCoBench/.github/HarnessFlow/_lib/workflow_contract.md and C:/Users/Hang Yu/Desktop/MiHaCoBench/.github/HarnessFlow/philosophy/philosophy.instructions.md (resolved via Pack Path Resolution) before any workflow-specific work.
Read the matched instruction file in its entirety.
Require every subagent to read and follow C:/Users/Hang Yu/Desktop/MiHaCoBench/.github/HarnessFlow/_lib/workflow_contract.md and C:/Users/Hang Yu/Desktop/MiHaCoBench/.github/HarnessFlow/philosophy/philosophy.instructions.md (resolved via Pack Path Resolution) before doing workflow-specific work.
Subagent model: Create every subagent on the model the instructions specify — the subagent_model header — following the Subagent Launch Contract's model-selection steps in C:/Users/Hang Yu/Desktop/MiHaCoBench/.github/HarnessFlow/_lib/workflow_contract.md (resolved via Pack Path Resolution). Since Codex does not auto-inherit the main agent's model (a worker's model is set via its named custom-agent definition), explicitly instruct every subagent: "Use the model the instructions specify via subagent_model: a specific id is a deliberate override — use it even if it is smaller; when it is inherit or unset, use the exact same model as the main agent and do not downgrade."
Follow the matched instruction file step-by-step to complete the request.

Read the full file on GitHub · 50 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.

7d ago First seen · 50 lines · 1,061 tokens per session scan A 877c52091bbb

Subscribe to this mod's changes

MiHaCoBench AGENTS.md is an instructions file published in the GitHub repository HangYu8123/MiHaCoBench (45 stars, last pushed 1mo ago), licensed MIT. It adds 1,061 tokens to every session, about $0.0053 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.

codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,182 tokens

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).

microsoft/vscode · 6,785 tokens

MiHaCoBench: Instructions file for Codex