Borrowing it
Nothing to install: this file belongs to sous-chefs/postfix. 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/sous-chefs/postfix/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/sous-chefs/postfixWrote 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/sous-chefs/postfix/copilot-instructions)<a href="https://agentmods.dev/instructions/sous-chefs/postfix/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/sous-chefs/postfix/copilot-instructions/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/sous-chefs/postfix/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/sous-chefs/postfix/copilot-instructions.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 | $0.01015 | $0.01015 |
| Opus 5.5 | $0.00406 | $0.00406 |
| Sonnet 5.5 | $0.00203 | $0.00203 |
| Haiku 4.5 | $0.00102 | $0.00102 |
Grade A, and why
postfix copilot-instructions.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 1mo 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- varnish copilot-instructions.md — 94% identical, 10 lines differ
- ossec copilot-instructions.md — 92% identical, 10 lines differ
How it starts
The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copilot Instructions for Sous Chefs Cookbooks
Repository Overview
Chef cookbook for managing software installation and configuration. Part of the Sous Chefs cookbook ecosystem.
Key Facts: Ruby-based, Chef >= 16 required, supports various OS platforms (check metadata.rb, kitchen.yml and .github/workflows/ci.yml for which platforms to specifically test)
Project Structure
Critical Paths:
recipes/- Chef recipes for cookbook functionality (if this is a recipe-driven cookbook)resources/- Custom Chef resources with properties and actions (if this is a resource-driven cookbook)spec/- ChefSpec unit teststest/integration/- InSpec integration tests (tests all platforms supported)test/cookbooks/ortest/fixtures/- Example cookbooks used during testing that show good examples of custom resource usageattributes/- Configuration for recipe driven cookbooks (not applicable to resource cookbooks)libraries/- Library helpers to assist with the cookbook. May contain multiple files depending on complexity of the cookbook.templates/- ERB templates that may be used in the cookbookfiles/- files that may be used in the cookbookmetadata.rb,Berksfile- Cookbook metadata and dependencies
Build and Test System
Environment Setup
MANDATORY: Install Chef Workstation first - provides chef, berks, cookstyle, kitchen tools.
Essential Commands (strict order)
berks install # Install dependencies (always first)
cookstyle # Ruby/Chef linting
yamllint . # YAML linting
markdownlint-cli2 '**/*.md' # Markdown linting
chef exec rspec # Unit tests (ChefSpec)
# Integration tests will be done via the ci.yml action. Do not run these. Only check the action logs for issues after CI is done running.
Critical Testing Details
- Kitchen Matrix: Multiple OS platforms × software versions (check kitchen.yml for specific combinations)
- Docker Required: Integration tests use Dokken driver
- CI Environment: Set
CHEF_LICENSE=accept-no-persist - Full CI Runtime: 30+ minutes for complete matrix
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.
- 1mo ago First seen · 96 lines · 1,015 tokens per session scan A 5fef7f2ec462
postfix copilot-instructions.md is an instructions file published in the GitHub repository sous-chefs/postfix (102 stars, last pushed 8d ago), licensed Apache-2.0. It adds 1,015 tokens to every session, about $0.0041 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.
Other instructions, from other repositories
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).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.