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/.github/instructions/markdown-style.instructions.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/markdown-style)<a href="https://agentmods.dev/instructions/timothywarner/copilot-dev/markdown-style"><img src="https://agentmods.dev/badge/instructions/timothywarner/copilot-dev/markdown-style/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/markdown-style"><img src="https://agentmods.dev/badge/instructions/timothywarner/copilot-dev/markdown-style.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 | $0.00459 | $0.00459 |
| Opus 5.5 | $0.00184 | $0.00184 |
| Sonnet 5.5 | $0.00092 | $0.00092 |
| Haiku 4.5 | $0.00046 | $0.00046 |
Grade A, and why
copilot-dev markdown-style.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 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.
What it actually says
Markdown Authoring Instructions
Course content in this repository is projected on screen during live training and read by learners afterward. Formatting problems that are invisible in a rendered preview become obvious on a projector, so treat these as hard requirements rather than preferences.
These rules align with .markdownlint.json at the repository root. When the two disagree,
.markdownlint.json wins because it is enforced mechanically.
Spacing
- Insert a blank line between headings, paragraphs, lists, and code blocks.
- Add a blank line before and after every list, table, and fenced code block.
- Never leave two consecutive blank lines.
Structure
- Use ATX headings (
##), never Setext underlines. - Do not skip heading levels. An
h2is followed by anh3, not anh4. - Exactly one
h1per file, as the first line.
Code blocks
- Always fence with triple backticks and declare a language (
```powershell,```json). The language tag drives syntax highlighting on the projector. - Use
textfor terminal output that has no meaningful syntax.
Links and accessibility
- Write descriptive link text. "See the supported models reference" beats "click here".
- Every image needs alt text describing its content, not its filename.
- Never rely on color alone to convey meaning. Pair it with a label, shape, or position, because a meaningful share of any audience cannot distinguish red from green.
Date-sensitive content
GitHub Copilot ships changes weekly, so undated claims rot silently.
- Anchor version-specific claims to a date: "as of July 2026" or "GA February 25, 2026".
- Cite the primary source (
docs.github.com,github.blog/changelog) for any model name, price, tier, or version number. - Prefer "current as of " over "latest", which is never true for long.
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 · 48 lines · 459 tokens per session scan A 063962dec86d
copilot-dev markdown-style.instructions.md is an instructions file published in the GitHub repository timothywarner/copilot-dev (46 stars, last pushed 1mo ago), licensed MIT. It adds 459 tokens to every session, about $0.0018 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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