A browser launcher for a Microsoft App's cloud version or a cloud-built preview. It can open the latest deployed snapshot, the current main branch, or a specific source-control commit.

Use it to open the live app, review the main branch, or test the app as it existed at a particular commit.

It lets you inspect or test the app without starting a local development server, while making clear whether you are viewing deployed or unpublished code.

play — Skill for Claude Code by microsoft/managed-apps

About the project

Microsoft Managed Apps is a project for building custom web applications with React, TypeScript, and Vite, and it provides Microsoft's official templates and development tooling. Developers use its SDK, CLI, and Vite plugin to create and manage these applications. Its catalogue add-ons help AI coding agents build Microsoft Managed Apps.

microsoft/managed-apps · 36 stars · on GitHub

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.

Any agent

npx skills add microsoft/managed-apps --skill play

Clone the repo

git clone --depth 1 https://github.com/microsoft/managed-apps

Made for: Claude Code.

Or install microsoft-managed-apps, the plugin that ships this one along with the rest of its 22 skills, 1 agent.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/microsoft/managed-apps/play/github.svg)](https://agentmods.dev/skills/microsoft/managed-apps/play)

Your own site

<a href="https://agentmods.dev/skills/microsoft/managed-apps/play"><img src="https://agentmods.dev/badge/skills/microsoft/managed-apps/play/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/microsoft/managed-apps/play"><img src="https://agentmods.dev/badge/skills/microsoft/managed-apps/play.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,138 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00044	$0.01138
Opus 5.5	$0.00018	$0.00455
Sonnet 5.5	$0.00009	$0.00228
Haiku 4.5	$0.00004	$0.00114

Measured 5d ago against content hash 89ec5388ebe9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

play 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 5d 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.

plugins/microsoft-managed-apps/skills/play/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

📋 Shared Instructions: shared-instructions.md — Cross-cutting concerns.

Play

Opens a Microsoft App in the browser by fetching its cloud play URL and launching it. No local dev server required.

Mode	Command	What opens
`live` (default)	`ms app play`	The most recently deployed version. A snapshot — does not update until `ms app deploy` is run again.
`preview` (main)	`ms app play --mode preview`	Built from the `main` branch on demand — always reflects the latest pushed code, even without a deploy.
`preview` (commit)	`ms app play --mode preview --commit <sha>`	App as of a specific commit SHA — useful for code review or regression testing.

Live vs. preview: Live requires a prior ms app deploy. Preview builds from source on demand — it works without any deployment and always reflects unpublished code.

Workflow

Memory Bank → 2. Verify Project + Env → 3. Resolve Mode → 4. Run → 5. Surface URL

Step 1: Check Memory Bank

Read memory-bank.md per shared-instructions.md for the app's environment/app identifiers, if recorded.

Step 2: Verify Project + Env

test -f ms.config.json || { echo "Not in a Microsoft App workspace."; exit 1; }
BIN=ms
$BIN auth status                                         # must report the expected UPN

--app and --environment-id can be passed explicitly to run from outside a project directory — ms.config.json is only needed for the defaults.

Step 3: Resolve Mode

If not already clear from the user's request, ask:

"Do you want to open the live deployed version, a preview of the latest code on main, or a preview of a specific commit?"

Map intent to mode:

User says	Mode
"live", "deployed", no qualifier	`live` (default — no flag needed)
"preview", "latest", "unpublished", "before deploy"	`--mode preview`
"preview at commit X" / specific SHA provided	`--mode preview --commit <sha>`

Read the full file on GitHub · 121 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.

5d ago Changed · -2 lines 89ec5388ebe9
2mo ago First seen · 123 lines · 44 tokens per session scan A 18a458e40550

Subscribe to this mod's changes

play is a skill published in the GitHub repository microsoft/managed-apps (36 stars, last pushed 3d ago), licensed MIT. It adds 44 tokens to every session and 1,138 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.

play next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
playmicrosoft/managed-apps	Skill	36	3d ago	MIT	A	44	Claude Code
imagegenopenai/codex	Skill	134k	today	Apache-2.0	A	113	Codex
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	yesterday	MIT	A	200	Claude Code, Codex
playwright-climicrosoft/playwright	Skill	100k	yesterday	Apache-2.0	A	19	Claude Code
browser-automationopenclaw/openclaw	Skill	394k	today	MIT	A	36	Claude Code
systematic-debuggingobra/superpowers	Skill	314k	4d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	today	MIT	A	95	Claude Code