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ab900 copilot-instructions.md

ab900 copilot-instructions.md is an instructions file for GitHub Copilot from timothywarner-org/ab900. It costs 2,254 tokens per session, scanned A, original, MIT.

A repository guide for GitHub Copilot agents and skills used to create and study for Microsoft's AB-900 certification. It describes where these files live and how they must be structured.

In plain words
What is it for?
It is for maintaining Copilot customization files, linking prompts to agents, and keeping certification-study materials consistent and grounded.
Why use it?
It gives coding agents clear rules for editing agent definitions, skills, prompts, and workspace tool settings.

Instructions file for GitHub Copilot

not rated 26 1mo ago A scan 2,254 tokens original MIT
View the source file timothywarner-org/ab900
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/timothywarner-org/ab900/copilot-instructions
Clone the repo
git clone --depth 1 https://github.com/timothywarner-org/ab900

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 ab900 copilot-instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/timothywarner-org/ab900/copilot-instructions.svg)](https://agentmods.dev/instructions/timothywarner-org/ab900/copilot-instructions)
Your own site
<a href="https://agentmods.dev/instructions/timothywarner-org/ab900/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/timothywarner-org/ab900/copilot-instructions.svg" alt="Measured on agentmods" height="20"></a>
Per session 2,254 This file is loaded in full into every session.
When invoked 2,254 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.02254 $0.02254
Opus 5 $0.01127 $0.01127
Sonnet 5 $0.00451 $0.00451
Haiku 4.5 $0.00225 $0.00225

Measured 3d ago against content hash e374a091825f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ab900 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 3d 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 · 145 lines

How it starts

The opening of the file, as written. The whole thing — 145 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Copilot instructions

Repository purpose

  • This repo defines GitHub Copilot agent behavior and AB-900 skills. There is no app code; the primary artifacts are agent definitions and skill specs.

Key locations

  • Agent definition: .github/agents/ab900-cert-buddy-agent.agent.md
  • Skills: .github/skills/*/SKILL.md
  • Prompts: .github/prompts/ab900-practice-questions.prompt.md, .github/prompts/ab900-scenario-walkthrough.prompt.md, .github/prompts/ab900-study-planner.prompt.md
  • MCP servers (workspace only): .vscode/mcp.json

Skill and agent conventions

  • Each skill file is a single YAML frontmatter block followed by Markdown.
  • The skill name used by agents must match the YAML frontmatter name in the skill file, not the folder name.
  • Agent files use YAML frontmatter with tools and skills lists. Keep tool IDs scoped to MCP servers defined in .vscode/mcp.json.
  • Prompt files (in .github/prompts/) reference agents by the name field in the agent's YAML frontmatter via the agent: key. The current value is ab900-cert-buddy-agent. If the agent is renamed, update all prompt files that reference it.
  • Current skills:
    • ab900-item-creator (exam item generation)
    • ab900-scenario-walkthrough (scenario-based walkthrough delivery)
    • ab900-study-planner (personalized study plan generation)

Grounding and validation rules

  • Questions must be grounded in Microsoft Learn content first. Use the Microsoft Learn MCP server (mcp__claude_ai_Microsoft_Learn_MCP_Server) to retrieve current Learn documentation when available; this server provides microsoft_docs_search and microsoft_docs_fetch tools for grounding content in official MS Learn documentation.
  • Use Context7 (ab900buddy-context7) when M365 admin PowerShell or Graph API syntax accuracy matters.
  • Use MarkItDown (ab900buddy-markitdown) to convert user-supplied PDFs or Office documents to markdown for analysis.
  • If a request mixes questions and scenario walkthroughs, split the output and apply the correct skill to each section.
  • Grounding chain: Microsoft Learn first (via MS Learn MCP or web search) -> Context7 for M365 admin syntax -> MarkItDown for user documents.

Read the full file on GitHub · 145 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. 3d ago First seen · 145 lines · 2,254 tokens per session scan A e374a091825f

Subscribe to this mod's changes

ab900 copilot-instructions.md is an instructions file published in the GitHub repository timothywarner-org/ab900 (26 stars, last pushed 1mo ago), licensed MIT. It adds 2,254 tokens to every session, about $0.0113 per session on Opus 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.

Building agentsab900ai-agentscertificationcopilot-studioexam-prepmicrosoft
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