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 skills add microsoft/skills-for-copilot-studio --skill add-actiongit 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/skills/microsoft/skills-for-copilot-studio/add-action)<a href="https://agentmods.dev/skills/microsoft/skills-for-copilot-studio/add-action"><img src="https://agentmods.dev/badge/skills/microsoft/skills-for-copilot-studio/add-action.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00045 | $0.01419 |
| Opus 5 | $0.00023 | $0.00709 |
| Sonnet 5 | $0.00009 | $0.00284 |
| Haiku 4.5 | $0.00005 | $0.00142 |
Grade A, and why
add-action 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 8d 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 — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add Connector Action (Guide)
This skill guides users through adding a new connector action to their Copilot Studio agent. It does NOT write action YAML directly because connector actions require a connection reference that can only be created through the Copilot Studio UI.
Why This Is a Guide, Not a Generator
Connector actions need:
- A connection reference — an authenticated link to the external service (Teams, Outlook, SharePoint, etc.)
- The connection reference can only be created by the user authenticating in the Copilot Studio portal
- Once the action is added via the UI and pulled locally, the YAML can be edited with
/copilot-studio:edit-action
Connector Lookup
Help the user find the right connector and operation before they go to the UI. Use the connector lookup tool. Important: The connector lookup script only covers a subset of connectors (run list to see which ones). If the user's requested connector is not in the list, tell the user they need to find and add the connector action entirely through the Copilot Studio portal, then ask them to pull again the files locally. Once pulled, /copilot-studio:edit-action can still be used to customize the YAML.
When the connector IS available, use the lookup tool to help the user before they go to the UI:
node ${CLAUDE_SKILL_DIR}/../../scripts/connector-lookup.bundle.js list
node ${CLAUDE_SKILL_DIR}/../../scripts/connector-lookup.bundle.js operations <connector>
node ${CLAUDE_SKILL_DIR}/../../scripts/connector-lookup.bundle.js operation <connector> <operationId>
node ${CLAUDE_SKILL_DIR}/../../scripts/connector-lookup.bundle.js search <keyword>
<connector> matches by API name (shared_office365) or partial display name (outlook).
Use these to help the user understand:
- Which connector has the operation they need
- What the operation is called (so they can find it in the UI)
- What inputs and outputs it expects
Instructions
- Understand what the user wants — ask clarifying questions if the request is vague (e.g., "send a message" — Teams? Outlook? Slack?)
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.
- 8d ago First seen · 114 lines · 45 tokens per session scan A 55a31738ce20
add-action is a skill published in the GitHub repository microsoft/skills-for-copilot-studio (432 stars, last pushed 4d ago), licensed MIT. It adds 45 tokens to every session and 1,419 once invoked, about $0.0002 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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