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aptu-coder: Instructions file for GitHub Copilot

.github/instructions/src.instructions.md

aptu-coder src.instructions.md is an instructions file for GitHub Copilot from clouatre-labs/aptu-coder. It costs 466 tokens per session, scanned A, original, Apache-2.0.

A set of coding rules for the aptu-coder project’s Rust source code. It covers the rmcp tool API, error handling, logging, tracing, and dependency changes.

In plain words
What is it for?
Reviewing or implementing rmcp tools, handling errors, adding tracing to I/O and parsing code, checking dependency changes, and enforcing project conventions.
Why use it?
It catches project-specific mistakes before they become review or runtime problems. The rules make tool responses, failures, observability, and scope consistent.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is clouatre-labs/aptu-coder's own configuration. It tells GitHub Copilot how to work on aptu-coder 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 aptu-coder configures →

not rated 6repo 3d ago A scan 466 tokens original Apache-2.0
View source ↗ clouatre-labs/aptu-coder
Reuse

Borrowing it

Nothing to install: this file belongs to clouatre-labs/aptu-coder. 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/clouatre-labs/aptu-coder/main/.github/instructions/src.instructions.md
Clone the repo
git clone --depth 1 https://github.com/clouatre-labs/aptu-coder

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 aptu-coder src.instructions.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/clouatre-labs/aptu-coder/src"><img src="https://agentmods.dev/badge/instructions/clouatre-labs/aptu-coder/src.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 466 This file is loaded in full into every session.
When invoked 466 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 $0.00466 $0.00466
Opus 5.5 $0.00186 $0.00186
Sonnet 5.5 $0.00093 $0.00093
Haiku 4.5 $0.00047 $0.00047

Measured 1mo ago against content hash 3822855c023d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

aptu-coder src.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/instructions/src.instructions.md · 39 lines

What it actually says

rmcp API correctness

Do not rely on training data for rmcp APIs -- verify against Cargo.lock and src/lib.rs.

  • Every #[tool(...)] attribute requires output_schema = schema_for_type::<T>(). Titles go in annotations(title = "..."), not as a top-level title = "..." field. Flag tools missing output_schema.
  • Tool methods must take a RequestContext<RoleServer> as the second parameter after &self. Flag methods that omit it or use a different type.
  • #[tool_router] and #[tool_handler] go on separate impl blocks. Flag if either appears on the wrong block.
  • Every CallToolResult::success(...) must be chained with .with_meta(...). Flag success responses missing it.

Error handling

  • Use thiserror for error types (library crate). Flag use of anyhow in src/.
  • Prefer ? over .unwrap() or .expect() in non-test code. Flag .unwrap() in src/ unless a comment explains why it cannot fail.

Observability

  • Flag async fn that perform I/O or tree-sitter parsing without #[instrument].
  • Flag direct eprintln! or println! in src/.

Scope

  • Flag any new dependency in Cargo.toml not justified in the PR description.
  • Flag unsafe blocks unconditionally.
  • Flag changes to files outside the scope described in the PR description.

Tool parameter invariants

Behavioral contracts enforced at runtime -- must be preserved across refactors:

  • summary=true and cursor together must return INVALID_PARAMS. Flag any change that weakens this check.
  • impl_only=true on a non-Rust directory must return INVALID_PARAMS. Flag changes that allow it to silently no-op instead of erroring.
  • analyze_module accepts path only. Flag any PR that adds pagination, summary, force, or verbose to its parameter type.
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 · 39 lines · 466 tokens per session scan A 3822855c023d

Subscribe to this mod's changes

aptu-coder src.instructions.md is an instructions file published in the GitHub repository clouatre-labs/aptu-coder (6 stars, last pushed 3d ago), licensed Apache-2.0. It adds 466 tokens to every session, about $0.0019 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.

LanguagesRustaiastcall-graphcode-analysisdeveloper-toolstree-sitter
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