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synthesis-skills: Instructions file for Codex

AGENTS.md

synthesis-skills AGENTS.md is an instructions file for Codex, OpenCode from synthesisengineering/synthesis-skills. It costs 1,368 tokens per session, scanned A, original, Apache-2.0.

Repository instructions for a collection of portable AI coding skills that works with Codex and Claude Code. They define which folders own the skills, plugin files, marketplaces, and shared hooks.

In plain words
What is it for?
Use them when adding or changing synthesis skills, plugin manifests, marketplace entries, installation scripts, or lifecycle hooks.
Why use it?
They prevent changes from being made in generated or installed copies instead of the source repository. They also keep shared behavior and client-specific settings organized consistently.

Instructions file for CodexOpenCode

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

This is synthesisengineering/synthesis-skills's own configuration. It tells Codex and OpenCode how to work on synthesis-skills 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 synthesis-skills configures →

not rated 23repo changed yesterday A scan 1,368 tokens original Apache-2.0
View source ↗ synthesisengineering/synthesis-skills
Reuse

Borrowing it

Nothing to install: this file belongs to synthesisengineering/synthesis-skills. 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/synthesisengineering/synthesis-skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/synthesisengineering/synthesis-skills

Made for: Codex, OpenCode.

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Per session 1,368 This file is loaded in full into every session.
When invoked 1,368 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 $0.01368 $0.01368
Opus 5.5 $0.00547 $0.00547
Sonnet 5.5 $0.00274 $0.00274
Haiku 4.5 $0.00137 $0.00137

Measured yesterday against content hash de222249e3a0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

synthesis-skills 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 yesterday.

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 · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository Instructions: Synthesis Skills

Purpose

This public repository is the canonical source for portable synthesis engineering skills. It is packaged as one native plugin for Claude Code, OpenAI Codex and Muse while remaining compatible with the Agent Skills standard.

Canonical Sources

  • skills/ owns every public skill, script, reference, asset, license, and Codex interface.
  • .codex-plugin/plugin.json, .claude-plugin/plugin.json and .muse-plugin/plugin.json own the three client manifests. Their versions must match.
  • .agents/plugins/marketplace.json and .claude-plugin/marketplace.json own marketplace discovery.
  • hooks/hooks.json owns shared lifecycle-hook registration.
  • skills/synthesis-onboarding/scripts/setup.py installs the native plugin in each harness; native plugins are the only installation path.

Never edit installed plugin caches or user-level skill copies. Make the change here, verify it, merge it to main, then update the installed plugins.

Implementation Rules

  1. Search the existing skills and scripts before adding behavior.
  2. Keep shared behavior agent-neutral. Put client-specific metadata and event translation in the corresponding adapter.
  3. Give each skill one canonical directory under skills/.
  4. Keep SKILL.md under 8,000 bytes in the v5 format (docs/skill-format.md); move detailed material into references/.
  5. Keep executable behavior in version-controlled scripts with deterministic tests.
  6. Protective checks fail closed when required state or dependencies cannot be verified.
  7. Do not add compatibility shims unless the task explicitly requires them.
  8. Do not include credentials, private organization names, personal paths, or client-confidential examples in this public repository.

Cross-Client Contract

  • Every public skill requires SKILL.md with an SPDX license identifier in frontmatter and agents/openai.yaml. The repository-level LICENSE-APACHE and LICENSE-CC0 files carry the corresponding terms.
  • Claude Code and Codex must load the same skill source and shared scripts.
  • AGENTS.md is the tracked repository instruction source.
  • CLAUDE.md is only the Claude Code import adapter: @AGENTS.md.
  • Plugin-relative paths are required; absolute paths to a local checkout are forbidden.
  • Runtime conformance must verify enabled plugin state, duplicate direct copies, hooks, and project handoff behavior.

Read the full file on GitHub · 113 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. yesterday Changed · +3 lines · +72 tokens per session de222249e3a0
  2. 3d ago Changed · +3 lines · +60 tokens per session 3c94e622f81c
  3. 4d ago Changed · +3 lines · +77 tokens per session c86bde4d1bfc
  4. 1mo ago Changed · -6 lines · +93 tokens per session 8bceb4894e10
  5. 1mo ago Changed · +2 lines · +33 tokens per session 88ec208a5bbf
  6. 1mo ago Changed · -34 lines · -676 tokens per session 087fc6155e53
  7. 1mo ago Changed · +8 lines · +169 tokens per session 4fdf413ff147
  8. 1mo ago Changed · +3 lines · +68 tokens per session 969c71163382
  9. 1mo ago Changed · +6 lines · +76 tokens per session 01fcd6f91515
  10. 1mo ago First seen · 125 lines · 1,396 tokens per session scan A d9e43c7bf7d3

Subscribe to this mod's changes

synthesis-skills AGENTS.md is an instructions file published in the GitHub repository synthesisengineering/synthesis-skills (23 stars, last pushed yesterday), licensed Apache-2.0. It adds 1,368 tokens to every session, about $0.0055 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.

Related

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synthesis-skills AGENTS.md next to 6 instructions from other repositories
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deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode