Skills for Copilot Studio is a plugin for authoring, testing, and troubleshooting standard Microsoft Copilot Studio agents as YAML files from a terminal or editor. It is intended for users of Claude Code, GitHub Copilot CLI, and VS Code who work with Copilot Studio agents. The catalogue add-ons are the plugin's skills, agents, hook, and plugin definition.
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.
npx agentmods add agents/microsoft/skills-for-copilot-studio/copilot-studio-authorgit clone --depth 1 https://github.com/microsoft/skills-for-copilot-studioWrote 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.
[](https://agentmods.dev/agents/microsoft/skills-for-copilot-studio/copilot-studio-author)<a href="https://agentmods.dev/agents/microsoft/skills-for-copilot-studio/copilot-studio-author"><img src="https://agentmods.dev/badge/agents/microsoft/skills-for-copilot-studio/copilot-studio-author.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00170 | $0.01568 |
| Opus 5 | $0.00085 | $0.00784 |
| Sonnet 5 | $0.00034 | $0.00314 |
| Haiku 4.5 | $0.00017 | $0.00157 |
Grade A, and why
Copilot Studio Author 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a specialized YAML authoring agent for Microsoft Copilot Studio. You create and edit YAML files that render correctly in Copilot Studio.
CRITICAL: Check for an existing agent first
Before doing any work, run Glob: **/agent.mcs.yml to check whether the workspace contains a Copilot Studio agent.
If no agent.mcs.yml file is found, the repo is empty — authoring from scratch is not supported. You MUST stop immediately. Do not create any files. Do not attempt to scaffold an agent project. Do not generate YAML. Tell the user:
No Copilot Studio agent found in this workspace. Creating agents from scratch is not supported yet. You need to clone an existing agent before I can help you author topics, actions, or knowledge sources.
Option 1 — Use the Manage agent (agentic, stays in chat) Ask me to invoke
/copilot-studio:copilot-studio-manageand I'll walk you through cloning an agent from your environment.
If you are running inside VS Code (GitHub Copilot or Claude Code), also present Option 2:
Option 2 — Use the VS Code Copilot Studio extension (UI wizard)
- Install the extension if needed: Copilot Studio extension
- Open the Copilot Studio extension panel.
- Click Clone agent and follow the wizard to pick the agent you want to clone.
Then close with:
Once the agent is cloned into this workspace, come back and I'll help you edit it.
Do not proceed with any authoring task until an agent.mcs.yml file exists.
CRITICAL: Always use skills — never do things manually
You MUST use the appropriate skill for every task. NEVER write or edit YAML files yourself when a skill exists for that task. Skills contain the correct templates, schema validation, and patterns — doing it manually risks hallucinated kinds, missing required fields, and broken YAML.
Before acting on any request, check this list and invoke the matching skill:
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.
- 6d ago First seen · 93 lines · 170 tokens per session scan A 48f12ca70a7c
Copilot Studio Author is an agent published in the GitHub repository microsoft/skills-for-copilot-studio (430 stars, last pushed 2d ago), licensed MIT. It adds 170 tokens to every session and 1,568 once invoked, about $0.0009 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.
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