vibe-engineering: Instructions file for Codex

AGENTS.md

vibe-engineering AGENTS.md is an instructions file for Codex, OpenCode from ash1794/vibe-engineering. It costs 478 tokens per session, scanned A, original, MIT.

A project guide for vibe-engineering, a collection of 38 skills for AI-assisted software development. It explains where skills live, how agents invoke them, and the project's naming and file conventions.

In plain words
What is it for?
Use it when adding or changing skills, checking plugin files, running the project's command-line integration, or following its shared engineering conventions.
Why use it?
It helps an agent find and use the right development skill without guessing how the project is organized or how Claude Code and Codex differ.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions .claude-plugin; mentions CLAUDE.md; mentions subagents.

This is ash1794/vibe-engineering's own configuration. It tells Codex and OpenCode how to work on vibe-engineering 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 vibe-engineering configures →

Reuse

Borrowing it

Nothing to install: this file belongs to ash1794/vibe-engineering. 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/ash1794/vibe-engineering/master/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/ash1794/vibe-engineering

Made for: Codex, OpenCode.

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Per session 478 This file is loaded in full into every session.
When invoked 478 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 $0.00478 $0.00478
Opus 5.5 $0.00191 $0.00191
Sonnet 5.5 $0.00096 $0.00096
Haiku 4.5 $0.00048 $0.00048

Measured 12d ago against content hash b3adac839339, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

vibe-engineering 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 12d 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 · 42 lines

How it starts

The opening of the file, as written. The whole thing — 42 lines — stays where its author put it; the contents beside it link to each section on GitHub.

vibe-engineering

33 engineering discipline skills for AI-assisted development. Works with Claude Code, OpenAI Codex, and Gemini CLI.

Skills

Skills live in plugins/vibe-engineering/skills/*/SKILL.md (also symlinked at .agents/skills/, which Codex and Gemini CLI both read).

Each skill has YAML frontmatter with name (equal to its folder name) and description, following the Agent Skills standard. user-invocable: true is a Claude Code field that other agents ignore.

Invocation

  • Claude Code: /vibe-engineering:<skill-name> or implicit matching via description
  • Codex: $skill-name or implicit matching via description
  • Gemini CLI: implicit matching via description (/skills lists installed skills)

Tool Mapping

Skills describe capabilities ("run the tests", "dispatch a subagent", "ask the user") rather than one agent's tool names. references/platform-tools.md maps each capability to Claude Code, Codex, and Gemini CLI.

Project Conventions

  • Skill names use the vibe- prefix (e.g., vibe-quality-loop) and match their folder name
  • Each skill directory contains exactly one SKILL.md file
  • Skills are cross-project, with no language or framework assumptions, and are model-neutral (no hard-coded model names)
  • New skills must be listed in the README catalog and in vibe-help
  • Run bash scripts/validate-skills.sh before committing
  • The vibe-cli script in scripts/ provides CI/CD integration

Key Paths

Path Purpose
.claude-plugin/marketplace.json Marketplace catalog (vibe-plugins)
plugins/vibe-engineering/.claude-plugin/plugin.json Claude Code plugin manifest
plugins/vibe-engineering/skills/ All 33 skill definitions
.agents/skills/ Symlink for Codex and Gemini CLI discovery
scripts/vibe-cli CI/CD enforcement CLI
references/platform-tools.md Capability mapping across agents

See CLAUDE.md for the plugin-structure invariants that CI enforces.

Read the full file on GitHub · 42 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. 12d ago Changed b3adac839339
  2. 20d ago Changed f8f0061b0255
  3. 23d ago Changed · +5 lines · +149 tokens per session 1781bb1a9bc6
  4. 1mo ago First seen · 37 lines · 329 tokens per session scan A 9b9d86e855ad

Subscribe to this mod's changes

vibe-engineering AGENTS.md is an instructions file published in the GitHub repository ash1794/vibe-engineering (164 stars, last pushed 12d ago), licensed MIT. It adds 478 tokens to every session, about $0.0019 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.

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