ui-widget-developer

A development guide for MCP servers that provide interactive widgets in Copilot Chat. MCP is a standard way for an AI agent to call tools supplied by another server.

In plain words
What is it for?
Use it to build MCP servers for Microsoft 365 Copilot, create widgets with the OpenAI Apps SDK or MCP Apps SDK, and implement tools that render in Copilot Chat.
Why use it?
It explains how the server, tools, and widget interface fit together, including the React and Fluent UI pieces used for interactive displays.

Skill for Claude CodeCodex

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 skills/microsoft/work-iq/ui-widget-developer
Any agent
npx skills add microsoft/work-iq --skill ui-widget-developer
Clone the repo
git clone --depth 1 https://github.com/microsoft/work-iq

Made for: Claude Code, Codex.

Per session 208 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,886 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin unknown 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 $0.00208 $0.05886
Opus 5 $0.00104 $0.02943
Sonnet 5 $0.00042 $0.01177
Haiku 4.5 $0.00021 $0.00589

Measured 2d ago against content hash 7d5b948c53ab, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

ui-widget-developer scanned grade B with 1 finding 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 2d 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.

Subtle steeringmediumPrompt injection

Instructions that bias recommendations or shape behaviour without the user noticing.

**FULL AUTOMATION:** Never tell the user to run commands manually. Install tools, authenticate, start services — do everything automatically. Only ask the user for interactive input that truly requires them (like device
plugins/microsoft-365-agents-toolkit/skills/ui-widget-developer/SKILL.md · 439 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

6 files 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.

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. 2d ago First seen · 439 lines · 208 tokens per session scan B 7d5b948c53ab

Subscribe to this mod's changes

ui-widget-developer is a skill published in the GitHub repository microsoft/work-iq (982 stars, last pushed 4d ago), with no licence file. It adds 208 tokens to every session and 5,886 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it B with 1 finding (subtle steering). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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