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apple-agent-builder-kit: Instructions file for GitHub Copilot

.github/instructions/agent-builder.instructions.md

apple-agent-builder-kit agent-builder.instructions.md is an instructions file for GitHub Copilot from lhhiep2204/apple-agent-builder-kit. It costs 1,150 tokens per session, scanned A, original, MIT.

A set of rules for creating or updating GitHub Copilot customization files, such as agents, skills, instructions, prompts, and templates, including Apple-platform guidance.

In plain words
What is it for?
Use it when editing Copilot files in a repository's .github directory, especially for Apple projects.
Why use it?
It keeps each customization focused, correctly formatted, and supported by clear operating rules and validation checks.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file.

This is lhhiep2204/apple-agent-builder-kit's own configuration. It tells GitHub Copilot how to work on apple-agent-builder-kit 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 apple-agent-builder-kit configures →

not rated 6repo 6mo ago A scan 1,150 tokens original MIT
View source ↗ lhhiep2204/apple-agent-builder-kit
Reuse

Borrowing it

Nothing to install: this file belongs to lhhiep2204/apple-agent-builder-kit. 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/lhhiep2204/apple-agent-builder-kit/main/.github/instructions/agent-builder.instructions.md
Clone the repo
git clone --depth 1 https://github.com/lhhiep2204/apple-agent-builder-kit

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 apple-agent-builder-kit agent-builder.instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/lhhiep2204/apple-agent-builder-kit/agent-builder/github.svg)](https://agentmods.dev/instructions/lhhiep2204/apple-agent-builder-kit/agent-builder)
Your own site
<a href="https://agentmods.dev/instructions/lhhiep2204/apple-agent-builder-kit/agent-builder"><img src="https://agentmods.dev/badge/instructions/lhhiep2204/apple-agent-builder-kit/agent-builder/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 apple-agent-builder-kit agent-builder.instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/lhhiep2204/apple-agent-builder-kit/agent-builder"><img src="https://agentmods.dev/badge/instructions/lhhiep2204/apple-agent-builder-kit/agent-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,150 This file is loaded in full into every session.
When invoked 1,150 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 $0.01150 $0.01150
Opus 5.5 $0.00460 $0.00460
Sonnet 5.5 $0.00230 $0.00230
Haiku 4.5 $0.00115 $0.00115

Measured 2mo ago against content hash 4e9bcab2f607, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

apple-agent-builder-kit agent-builder.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.

.github/instructions/agent-builder.instructions.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Customization File Standards

Apply these rules when editing Copilot customization files in this repository.

File Purpose

  • Each file should serve one primary purpose
  • Prefer composition across agent, skill, instruction, and prompt files instead of one overloaded file
  • Do not create extra artifacts unless they improve execution quality or reuse

Frontmatter

Follow all YAML frontmatter rules in SKILL.md > YAML Frontmatter Generation. Verify keys against the allowlist in copilot-docs-registry.md.

Additional rules specific to instruction file editing:

  • Use applyTo only for guidance that should load automatically; keep narrow
  • Consider excludeAgent to limit instruction to coding-agent or code-review usage
  • Quote description values when punctuation could break parsing

Writing Standard

  • Prefer explicit operating rules over broad aspirations
  • State goals and non-goals when ambiguity is likely
  • Define decision criteria when multiple primitives are possible
  • Include validation checklists for complex or failure-prone workflows
  • Keep examples realistic and domain-specific
  • If the customization targets Apple projects, make platform assumptions and framework defaults explicit
  • Prefer Apple-specific terminology over generic mobile phrasing when the scope is Apple-only

Primitive Selection

Use the matching scaffold template in .github/templates/agent-builder/. Replace all <...> placeholders with project-specific content.

  • Agent: agent-template.md | Skill: skill-template.md | Instruction: instruction-template.md | Prompt: prompt-template.md | Hook: hook-checklist.md

For primitive selection decisions, apply primitive-decision-matrix.md. For role naming, reference apple-role-catalog.md.

Quality Checks

Before finalizing any non-trivial customization file, run the checklist in .github/templates/agent-builder/agent-audit-rubric.md. A file passes when it is specific, discoverable, and correctly scoped — not merely readable.

Read the full file on GitHub · 104 lines

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. 2mo ago First seen · 104 lines · 1,150 tokens per session scan A 4e9bcab2f607

Subscribe to this mod's changes

apple-agent-builder-kit agent-builder.instructions.md is an instructions file published in the GitHub repository lhhiep2204/apple-agent-builder-kit (6 stars, last pushed 6mo ago), licensed MIT. It adds 1,150 tokens to every session, about $0.0046 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.

Building agentsagileai-agentsapplecopilot-agentsdeveloper-toolinggithub-copilot
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