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-knowledgegit 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-knowledge)<a href="https://agentmods.dev/skills/microsoft/skills-for-copilot-studio/add-knowledge"><img src="https://agentmods.dev/badge/skills/microsoft/skills-for-copilot-studio/add-knowledge.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 | $0.00044 | $0.01874 |
| Opus 5 | $0.00022 | $0.00937 |
| Sonnet 5 | $0.00009 | $0.00375 |
| Haiku 4.5 | $0.00004 | $0.00187 |
Grade A, and why
add-knowledge 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 7d 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 — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add Knowledge Source
Add a knowledge source to the agent. Supports Public Website, SharePoint, and Custom API sources.
Instructions
-
Auto-discover the agent directory:
Glob: **/agent.mcs.ymlNEVER hardcode an agent name.
-
Parse the arguments to extract:
- URL
- Name / description (optional)
-
Determine the source type from the user's request:
- If the URL contains
sharepoint.com→ useSharePointSearchSource(but first normalize the URL — see below) - If the user wants to connect a custom search API or database → use
OnKnowledgeRequested(see Custom API section below) - Otherwise → use
PublicSiteSearchSource
- If the URL contains
-
If SharePoint: normalize the URL before using it. Copilot Studio requires a direct folder path like:
https://contoso.sharepoint.com/sites/MySite/Shared%20Documents/MyFolderUsers often paste URLs in other formats. Handle them as follows:
URL pattern Example Action Direct path ( /sites/.../Shared%20Documents/...)https://x.sharepoint.com/sites/Site/Shared%20Documents/FolderUse as-is — this is the correct format AllItems.aspx with ?id=param (...AllItems.aspx?id=...)https://x.sharepoint.com/.../AllItems.aspx?id=%2Fsites%2FSite%2FShared%20Documents%2FFolder&viewid=...Extract and decode the idquery parameter. URL-decode it to get the path (e.g./sites/Site/Shared%20Documents/Folder), then prepend the origin (https://x.sharepoint.com) to build the direct path. Drop all query parameters (?id=,&viewid=, etc.)Sharing link ( /:f:/s/...or/:x:/s/...)https://x.sharepoint.com/:f:/s/Site/EncodedToken?e=abcCannot convert — these are opaque sharing tokens with no extractable folder path. Ask the user: "That's a SharePoint sharing link — I can't extract the folder path from it. Could you navigate to the folder in SharePoint, copy the URL from the browser address bar, and paste it here?"
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 7d ago First seen · 149 lines · 44 tokens per session scan A be2cab4a044b
add-knowledge is a skill published in the GitHub repository microsoft/skills-for-copilot-studio (430 stars, last pushed 3d ago), licensed MIT. It adds 44 tokens to every session and 1,874 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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