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anvil: Instructions file for Codex

AGENTS.md

anvil AGENTS.md is an instructions file for Codex, OpenCode from sable-inc/anvil. It costs 3,467 tokens per session, scanned A, original, no licence file.

Contributor instructions for Anvil CLI, a command-line tool, covering its documentation, structure, and Go coding practices. Go is the programming language used by the project.

In plain words
What is it for?
Useful when editing Anvil CLI documentation or Go code, especially code built around interfaces, which define expected behavior between components.
Why use it?
They give an AI coding assistant the project rules and design context needed to make consistent changes.

Instructions file for CodexOpenCode

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

This is sable-inc/anvil's own configuration. It tells Codex and OpenCode how to work on anvil 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 anvil configures →

not rated 0repo 8mo ago A scan 3,467 tokens no licence archived
View source ↗ sable-inc/anvil
Reuse

Borrowing it

Nothing to install: this file belongs to sable-inc/anvil. 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/sable-inc/anvil/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/sable-inc/anvil

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 anvil AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/sable-inc/anvil/agents-md/github.svg)](https://agentmods.dev/instructions/sable-inc/anvil/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/sable-inc/anvil/agents-md"><img src="https://agentmods.dev/badge/instructions/sable-inc/anvil/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 anvil AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/sable-inc/anvil/agents-md"><img src="https://agentmods.dev/badge/instructions/sable-inc/anvil/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 3,467 This file is loaded in full into every session.
When invoked 3,467 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 unknown 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 $0.03467 $0.03467
Opus 5.5 $0.01387 $0.01387
Sonnet 5.5 $0.00693 $0.00693
Haiku 4.5 $0.00347 $0.00347

Measured 2mo ago against content hash ad2df6156c6b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

anvil 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 · 329 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 329 lines · 3,467 tokens per session scan A ad2df6156c6b

Subscribe to this mod's changes

anvil AGENTS.md is an instructions file published in the GitHub repository sable-inc/anvil (0 stars, last pushed 8mo ago), with no licence file. It adds 3,467 tokens to every session, about $0.0139 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.

GoLanguages
Related

anvil AGENTS.md compared with instructions from other repositories

anvil AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
anvil AGENTS.mdsable-inc/anvilInstructions file08mo agononeA3,467Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143kyesterdayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode