Borrowing it
Nothing to install: this file belongs to timothywarner-org/copilot-cert-prep. 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-org/copilot-cert-prep/main/CLAUDE.mdgit clone --depth 1 https://github.com/timothywarner-org/copilot-cert-prepWrote 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-org/copilot-cert-prep/claude-md)<a href="https://agentmods.dev/instructions/timothywarner-org/copilot-cert-prep/claude-md"><img src="https://agentmods.dev/badge/instructions/timothywarner-org/copilot-cert-prep/claude-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-org/copilot-cert-prep/claude-md"><img src="https://agentmods.dev/badge/instructions/timothywarner-org/copilot-cert-prep/claude-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 | $0.02340 | $0.02340 |
| Opus 5.5 | $0.00936 | $0.00936 |
| Sonnet 5.5 | $0.00468 | $0.00468 |
| Haiku 4.5 | $0.00234 | $0.00234 |
Grade A, and why
copilot-cert-prep CLAUDE.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.
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.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
This public teaching repository supports Tim Warner's Pass Your GitHub Copilot Certification Exam O'Reilly Live Learning class. Current delivery: Thursday, September 24, 2026, 9 a.m.-1 p.m. Central / 7-11 a.m. Pacific. Content baseline reviewed September 23, 2026. Follow the canonical course plan and shared repository instructions, which also govern GitHub Copilot in this repo.
Authority
- Exam scope: August 7, 2026 objectives, checked against the official GH-300 study guide.
- Product behavior: current GitHub Docs; client behavior: current VS Code documentation.
- Learner route: README, activities, study guide, resource links, practice bank.
- Delivery: published O'Reilly course, course plan, and September deck.
- Question style: style guide and fictional companies.
Microsoft writing guidance governs item style; O'Reilly is the training identity. Keep learner-facing branding, title slides, masters, footers, and speaker notes consistent with that identity. Superseded decks and exam PDFs belong in Git history, not the current learning route. COURSE-PLAN.md is the only course plan; do not add a dated or alternate one. The remaining June-named Markdown file is a compatibility redirect, not an alternate source of truth. The shared instructions list six removed directory trees that must not be recreated.
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 Changed · +59 lines · +1,215 tokens per session 3ee3bfdaef00
- 1mo ago Changed · -49 lines · -975 tokens per session 896753b45b09
- 1mo ago First seen · 103 lines · 2,100 tokens per session scan A e49a0a27e6aa
copilot-cert-prep CLAUDE.md is an instructions file published in the GitHub repository timothywarner-org/copilot-cert-prep (97 stars, last pushed 1mo ago), licensed MIT. It adds 2,340 tokens to every session, about $0.0094 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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.