idd-skill: Instructions file for GitHub Copilot

.github/copilot-instructions.md

idd-skill copilot-instructions.md is an instructions file for GitHub Copilot from kurone-kito/idd-skill. It costs 441 tokens per session, scanned A, original, MIT.

Repository instructions for IDD, or Issue-Driven Development, a workflow that organizes software work around tracked issues. They define how coding agents should use tools, communicate, and manage branches.

In plain words
What is it for?
Use them when contributing to a GitHub project that follows this IDD workflow, especially for issue handling, branch strategy, tool selection, and agent communication.
Why use it?
They give agents consistent project rules and compatibility guidance for tools such as GitHub Copilot CLI, VS Code Copilot Chat, Codex CLI, and others.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file. Also seen: mentions AGENTS.md; mentions Codex.

This is kurone-kito/idd-skill's own configuration. It tells GitHub Copilot how to work on idd-skill 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 idd-skill configures →

Reuse

Borrowing it

Nothing to install: this file belongs to kurone-kito/idd-skill. 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/kurone-kito/idd-skill/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/kurone-kito/idd-skill

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 idd-skill copilot-instructions.md

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

Your own site · 80×15
<a href="https://agentmods.dev/instructions/kurone-kito/idd-skill/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/kurone-kito/idd-skill/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 441 This file is loaded in full into every session.
When invoked 441 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 $0.00441 $0.00441
Opus 5.5 $0.00176 $0.00176
Sonnet 5.5 $0.00088 $0.00088
Haiku 4.5 $0.00044 $0.00044

Measured 1mo ago against content hash 5462b9ee219b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

idd-skill 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 · 38 lines

What it actually says

Guidelines for AI Agents (GitHub Copilot)

This file is the GitHub Copilot entry point: VS Code Copilot Chat, the standalone Copilot CLI, and the Copilot coding agent all discover it automatically, and this repository's own docs/idd-workflow.md entry-point table names it as the file to read first for Copilot execution surfaces. Copilot's tooling also already discovers AGENTS.md directly, which is the canonical, tool-neutral guide for Cursor CLI as well as the rest of this repository's AI-agent guidance — read it for everything except the Copilot-specific notes below.

Copilot-specific notes

  • Map the shared "continue autonomously for low-risk work, but pause and ask a concise question when uncertainty or hidden risk makes the next step unsafe" guidance in AGENTS.md onto this project's actual UI: switch to Plan mode and ask the user when that pause condition applies while working in Agent mode.
  • schemas/token-cost-event.schema.json's vendor enum (grok, claude, codex) has no value for GitHub Copilot yet — skip the Dogfood: token-cost events call rather than pass a mismatched vendor; a wrong tag would corrupt the shared dataset.
  • .github/instructions/idd-overview-core.instructions.md loads automatically for GitHub Copilot execution surfaces because it has applyTo: "**", but it is excluded from Copilot code review with excludeAgent: "code-review" so reviewer-side context stays lighter. Open the routed phase file manually when the current step changes.

Commit rules

See AGENTS.md for the full commit-message rules.

See docs/ai-strategy.md for why this repository's AI instructions are laid out this way.

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 Changed · +5 tokens per session 5462b9ee219b
  2. 1mo ago Changed · -330 lines · -3,198 tokens per session d76f69244b1f
  3. 1mo ago Changed · +4 lines · +69 tokens per session 123845da229b
  4. 1mo ago Changed · +26 lines · +312 tokens per session 46099def7414
  5. 1mo ago First seen · 338 lines · 3,253 tokens per session scan A c67cf1051aec

Subscribe to this mod's changes

idd-skill copilot-instructions.md is an instructions file published in the GitHub repository kurone-kito/idd-skill (11 stars, last pushed today), licensed MIT. It adds 441 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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