Borrowing it
Nothing to install: this file belongs to jl-cmd/claude-dev-env. 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/jl-cmd/claude-dev-env/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/jl-cmd/claude-dev-envWrote 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/jl-cmd/claude-dev-env/copilot-instructions)<a href="https://agentmods.dev/instructions/jl-cmd/claude-dev-env/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/jl-cmd/claude-dev-env/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/jl-cmd/claude-dev-env/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/jl-cmd/claude-dev-env/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 | $0.00736 | $0.00736 |
| Opus 5.5 | $0.00294 | $0.00294 |
| Sonnet 5.5 | $0.00147 | $0.00147 |
| Haiku 4.5 | $0.00074 | $0.00074 |
Grade A, and why
claude-dev-env 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 13d 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 — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copilot instructions
Hooks in this repo enforce the conventions below. Follow them so your suggestions match what the gates accept.
Canonical review contract: packages/claude-dev-env/docs/CODE_RULES.md.
Checked-in pointer: .cursor/BUGBOT.md.
Naming
- Full words, no abbreviations. Never name anything
ctx,cfg,msg,btn,idx,cnt,tmp,elem, orval— writecontext,configuration,message,button,index,count,element, and so on. - Never use the vague names
result,data,output,response,value,item, ortemp. Pick a domain noun that says what the thing is. - Never start a function name with
handle_,process_,manage_, ordo_. Name the action:validate_order,send_invite,build_prompt. - Boolean names start with
is_,has_,should_,can_,was_, ordid_(camelCaseis/has/should/can/was/didin JavaScript and TypeScript). - Loop variables read as
each_<noun>. The single lettersi,j,kare fine for numeric loops andefor a caught exception.
Comments and documentation
- Do not add code comments. Preserve existing comments. Docstrings remain allowed.
- When a change touches code that an existing comment describes or is attached to, remove that comment in the same change and carry its meaning through clear names and structure. Leave comments tied to untouched code unchanged. Keep comment cleanup inside the requested task.
- Production and tests follow one rule. Changed directive, TODO, FIXME, HACK, XXX, and type-ignore comments are removed. Do not add or justify them.
- Docstrings on modules, classes, and functions are welcome. Keep the prose in step with the code: a docstring that lists the cases the body handles lists every one of them.
- Never drop an existing comment on a line you are not otherwise changing.
- Documentation describes the current state of the code. State what the code is and does.
Types
- Every function parameter and every return is typed.
- Do not use
Any, do not usecast(), or add# type: ignore; remove the escape hatch and use a typed boundary or real type.
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.
- 13d ago Changed · -4 tokens per session aae1d084cf2e
- 1mo ago Changed · +2 lines · +62 tokens per session 3925da8c8754
- 1mo ago First seen · 47 lines · 678 tokens per session scan A 79831627ca8b
claude-dev-env copilot-instructions.md is an instructions file published in the GitHub repository jl-cmd/claude-dev-env (6 stars, last pushed 13d ago), licensed MIT. It adds 736 tokens to every session, about $0.0029 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.
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