quarry: Instructions file for GitHub Copilot

.github/copilot-instructions.md

quarry copilot-instructions.md is an instructions file for GitHub Copilot from punt-labs/quarry. It costs 375 tokens per session, scanned A, original, MIT.

Project-specific instructions for GitHub Copilot code reviews, focusing reviews on correctness, security, API contracts, concurrency, and resource handling.

In plain words
What is it for?
Use them when reviewing code in the Quarry project, especially to identify bugs, unsafe behavior, missing error cases, and resource leaks.
Why use it?
They keep reviews focused on real defects and prevent repeated comments about formatting or checks handled by automated tools.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is punt-labs/quarry's own configuration. It tells GitHub Copilot how to work on quarry itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything quarry configures →

Reuse

Borrowing it

Nothing to install: this file belongs to punt-labs/quarry. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/punt-labs/quarry/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/punt-labs/quarry

Made for: GitHub Copilot.

Wrote 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.

agentmods badge for quarry copilot-instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/punt-labs/quarry/copilot-instructions/github.svg)](https://agentmods.dev/instructions/punt-labs/quarry/copilot-instructions)
Your own site
<a href="https://agentmods.dev/instructions/punt-labs/quarry/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/punt-labs/quarry/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.

agentmods 80×15 button for quarry copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/punt-labs/quarry/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/punt-labs/quarry/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 375 This file is loaded in full into every session.
When invoked 375 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00375 $0.00375
Opus 5.5 $0.00150 $0.00150
Sonnet 5.5 $0.00075 $0.00075
Haiku 4.5 $0.00038 $0.00038

Measured 1mo ago against content hash 1a019817006f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

quarry 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.

.github/copilot-instructions.md · 27 lines

What it actually says

Copilot Code Review Instructions

What to focus on

  • Logic errors, off-by-one, null/None paths, unhandled edge cases
  • Security: injection, credential exposure, path traversal, unsafe deserialization
  • API contract violations: function returns wrong type, missing error case, changed signature without updating callers
  • Concurrency issues: race conditions, shared mutable state, missing locks
  • Resource leaks: unclosed files, sockets, database connections

What NOT to flag

  • OO structure scores (method_ratio, encapsulation, module_size, etc.) — tools/oo_score.py enforces these via a ratchet mechanism. Do not duplicate its job.
  • New files that don't meet absolute OO thresholds — this is expected. The ratchet applies on subsequent changes.
  • Formatting — ruff format handles this. Do not comment on whitespace, line length, quote style, or trailing commas.
  • Import order — ruff check --select I handles this.

Do NOT suggest

  • Adding # noqa, # type: ignore, # pylint: disable, or @pytest.mark.xfail to suppress errors. The project policy is: fix the code or escalate to the operator. Suppressions require explicit operator approval.
  • Lowering max-complexity, relaxing type checker strictness, or widening per-file-ignores.
  • Replacing __new__ with __init__ — this project uses __new__ as the constructor by design.

Context

This project uses an OO ratchet: make check-oo compares OO quality scores against a committed baseline (.oo-baseline.json). Every commit must improve at least one metric on touched files and regress none. The baseline is updated via make update-oo and committed alongside the code change.

Changes

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.

  1. 1mo ago First seen · 27 lines · 375 tokens per session scan A 1a019817006f

Subscribe to this mod's changes

quarry copilot-instructions.md is an instructions file published in the GitHub repository punt-labs/quarry (7 stars, last pushed 2d ago), licensed MIT. It adds 375 tokens to every session, about $0.0015 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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