Borrowing it
Nothing to install: this file belongs to timothywarner/copilot-dev. 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/timothywarner/copilot-dev/main/AGENTS.mdgit clone --depth 1 https://github.com/timothywarner/copilot-devWrote 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/timothywarner/copilot-dev/agents-md)<a href="https://agentmods.dev/instructions/timothywarner/copilot-dev/agents-md"><img src="https://agentmods.dev/badge/instructions/timothywarner/copilot-dev/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.
<a href="https://agentmods.dev/instructions/timothywarner/copilot-dev/agents-md"><img src="https://agentmods.dev/badge/instructions/timothywarner/copilot-dev/agents-md.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 | $0.01060 | $0.01060 |
| Opus 5.5 | $0.00424 | $0.00424 |
| Sonnet 5.5 | $0.00212 | $0.00212 |
| Haiku 4.5 | $0.00106 | $0.00106 |
Grade A, and why
copilot-dev 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.
How it starts
The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Repository Guidelines
Project Structure & Module Organization
This repository is a teaching workspace for GitHub Copilot for Developers (O'Reilly live training).
- Root:
README.md,CLAUDE.md,AGENTS.md,COURSE_PLAN_*.md, slide decks (warner-copilot-*.pptx), and the cover image. Layout convention: course plan + PPTX at root; tutorials, info articles, and reference material underdocs/; code undersrc/andscripts/. - Tutorials, info articles, and reference material:
docs/COPILOT_AGENT_TUTORIAL.md,docs/COPILOT_CUSTOMIZATION_SAMPLES.md,docs/latest-github-news.md,docs/copilot-metrics-report-sample.md,docs/certification/(GH-300 exam prep),docs/references/(Microsoft Writing Style Guide + fictional-company pool). - Copilot customization demos:
.github/copilot-instructions.md,.github/instructions/*.instructions.md(Python MCP, Markdown style, PowerShell),.github/prompts/*.prompt.md,.github/agents/*.agent.md,.github/skills/*/SKILL.md, plus workflows under.github/workflows/. The singularAGENTS.md(this file) is also recognized at the repo root, and GitHub honors the nearestAGENTS.mdin the directory tree. - Hands-on demo app:
src/(Node + Express tips browser;src/data/holds tip data and the Copilot metrics sample). - Helper scripts:
scripts/Get-CopilotMetricsReport.ps1(live Copilot Metrics API report). - Historical reference content:
archive/(not actively maintained unless explicitly refreshing older material).
Build, Test, and Development Commands
Use commands from the repo root unless noted.
cd src && npm install: install dependencies (requires Node 18 or later).cd src && npm start: run the tips browser athttp://localhost:3000. SetPORTto override.cd src && npx markdownlint-cli "**/*.md" --ignore node_modules: lint Markdown against.markdownlint.json.
The demo app exposes GET /api/tips and GET /api/random-tip?exclude=<id>, and serves
src/public/index.html as a static front end.
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.
- 2mo ago First seen · 58 lines · 1,060 tokens per session scan A bd1f1fd4f7fe
copilot-dev AGENTS.md is an instructions file published in the GitHub repository timothywarner/copilot-dev (46 stars, last pushed 1mo ago), licensed MIT. It adds 1,060 tokens to every session, about $0.0042 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.
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