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teams-app-developer

Builds, tests, and deploys Microsoft 365 apps and agents for Teams and Copilot.

Skill by microsoftOfficial

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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

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About

Builds, tests, and deploys Microsoft 365 apps and agents for Teams and Copilot. Includes sub-skills for project creation, local testing, cloud deployment, troubleshooting, and Slack-to-Teams migration. USE FOR: Teams agent, bot, tab, message extension, Declarative Agents, Custom Engine Agents, local testing, Agents Playground, Azure resource provision, remote deployment, Slack to Teams migration, cross-platform bot development, Block Kit to Adaptive Cards conversion. DO NOT USE FOR: general web development, non-bot/non-Teams projects.

Use cases: testing, cloud, productivity, agent-building

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What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

Tools
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Network hosts it talks to 1

  • codeload.github.com · found in install command

Files it touches

  • ~/.claude/skills/teams-app-developer

What's inside

Skill name
teams-app-developer
Description
Builds, tests, and deploys Microsoft 365 apps and agents for Teams and Copilot. Includes sub-skills for project creation, local testing, cloud deployment, troubleshooting, and Slack-to-Teams migration. USE FOR: Teams agent, bot, tab, message extension, Declarative Agents, Custom Engine Agents, local testing, Agents Playground, Azure resource provision, remote deployment, Slack to Teams migration, cross-platform bot development, Block Kit to Adaptive Cards conversion. DO NOT USE FOR: general web development, non-bot/non-Teams projects.
License
MIT
Instructions
112 lines in SKILL.md · view on GitHub

Files (148)

  • SKILL.md
  • create-project.md · create-project/
  • README.md · docs/
  • advanced-features.md · docs/
  • feature-gaps.md · docs/
  • files-and-links.md · docs/
  • identity-and-auth.md · docs/
  • infrastructure.md · docs/
  • interactive-responses.md · docs/
  • messaging-and-commands.md · docs/
  • middleware-and-handlers.md · docs/
  • ui-components.md · docs/
  • workflows.md · docs/
  • README.md · experts/
  • _expert-ts.md · experts/
  • analyzer.md · experts/
  • app-distribution-packaging-ts.md · experts/bridge/
  • channel-ops-graph-ts.md · experts/bridge/
  • commands-slash-text-ts.md · experts/bridge/
  • cross-platform-advisor-ts.md · experts/bridge/
  • cross-platform-architecture-ts.md · experts/bridge/
  • events-activities-ts.md · experts/bridge/
  • files-upload-download-ts.md · experts/bridge/
  • identity-oauth-bridge-ts.md · experts/bridge/
  • index.md · experts/bridge/
  • infra-compute-ts.md · experts/bridge/
  • infra-observability-ts.md · experts/bridge/
  • infra-secrets-config-ts.md · experts/bridge/
  • infra-storage-ts.md · experts/bridge/
  • interactive-responses-ts.md · experts/bridge/
  • link-unfurl-preview-ts.md · experts/bridge/
  • middleware-handlers-ts.md · experts/bridge/
  • python-cross-platform.md · experts/bridge/
  • rate-limiting-resilience-ts.md · experts/bridge/
  • rest-only-integration-ts.md · experts/bridge/
  • scheduling-deferred-send-ts.md · experts/bridge/
  • shortcuts-extensions-ts.md · experts/bridge/
  • transport-socketmode-https-ts.md · experts/bridge/
  • ui-app-home-personal-tab-ts.md · experts/bridge/
  • ui-block-kit-adaptive-cards-ts.md · experts/bridge/
  • ui-legacy-attachments-cards-ts.md · experts/bridge/
  • ui-modals-dialogs-ts.md · experts/bridge/
  • workflow.composable-platform-ts.md · experts/bridge/
  • workflows-automation-ts.md · experts/bridge/
  • builder.md · experts/
  • bulk-conversion-strategy-ts.md · experts/convert/
  • dependency-mapping-ts.md · experts/convert/
  • index.md · experts/convert/
  • java-to-ts-ts.md · experts/convert/
  • js-to-ts-ts.md · experts/convert/
  • json-serialization-ts.md · experts/convert/
  • kotlin-to-ts-ts.md · experts/convert/
  • ruby-to-ts-ts.md · experts/convert/
  • type-mapping-ts.md · experts/convert/
  • aws-bot-deploy-ts.md · experts/deploy/
  • aws-cli-reference-ts.md · experts/deploy/
  • azure-bot-deploy-ts.md · experts/deploy/
  • azure-cli-reference-ts.md · experts/deploy/
  • index.md · experts/deploy/
  • fallback.md · experts/
  • …and 88 more

SKILL.md (first lines)

# Microsoft 365 Agents Toolkit Skill

Build Microsoft 365 agents and Teams apps using the ATK CLI.

## AI Behavior Guidelines

1. **Testing Strategy:** Recommend Agents Playground first (faster, no M365 needed). Use Teams workflow only if user explicitly requests it.

2. **Environment Variables:** NEVER hardcode secrets or make up placeholder values. Always ask users for real values.

3. **Error Handling:** Read error messages carefully. Check `env/.env.local`, `.localConfigs`, and `atk auth list`. Common pitfalls:
   - **`AADSTS7000229`** → `aadApp/create` missing `generateServicePrincipal: true` in YAML — add it and re-provision
   - **Missing `TENANT_ID`** in `.localConfigs` → SDK uses wrong token authority → 401 from Bot Connector
   - **401 persists after auth fix** → devtunnel URL may be blacklisted — create a fresh tunnel
   - See [troubleshoot/troubleshoot.md](troubleshoot/troubleshoot.md) for full diagnostic steps

4. **Long-Running Commands — WAIT for completion:**
   - `atk new`, `atk provision`, `atk deploy` can take several minutes
   - Always wait for completion before running the next step (timeout 120000ms+)

5. **Local Service Startup — Hangs terminal (expected):**
   - `npm run dev`, `npm start`, `python app.py`, `devtunnel host`, etc. will hang — the process keeps running indefinitely
   - ALWAYS run as a background process (`isBackground=true`) — NEVER use `isBackground=false` for these commands
   - Do NOT wait for it to "finish" — verify startup by checking output for "listening on port" or tunnel URL
   - If errors appear, read logs, diagnose, fix, restart
   - Use a **NEW terminal** to launch Agents Playground or open Teams sideloading URL

6. **Monitor App Logs:** Periodically check background terminal output for runtime errors. If the app crashes, read the error, fix the root cause, and restart.

7. **Telemetry Tagging:** Before running any `atk` CLI commands, set the session environment variable so all CLI invocations are tagged as skill-initiated:
   ```bash
   export ATK_CLI_SKILL=true
   ```
   Run this once at the start of the session. All subsequent `atk` commands in the same terminal will inherit it.

## ATK CLI Setup

```bash
atk --version  # Must be > 1.1.5-beta
```

If ATK is not found or version is too old:

```bash
npm i -g @microsoft/m365agentstoolkit-cli@beta
```

## CLI Global Options

| Option | Meaning          | Recommendation                                                                                                                                                                   |
| ------ | ---------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `-i`   | Interactive mode | Always use `-i false` in automation to avoid hanging                                                                                                                             |
| `-f`   | Project folder   | Default to be current directory, used when specifying a custom folder. When scaffolding a new project, this is the parent folder where the project folder will be created under. |
| `-h`   | Command help     | Use `atk <command> -h` for quick syntax checks                                                                                                                                   |

## Sub-Skills

| Sub-Skill            | When to Use                                                                      | Reference                                                                    |
| -------------------- | -------------------------------------------------------------------------------- | ---------------------------------------------------------------------------- |
| **create-project**   | Scaffold new project from template, choose template, `atk new`                   | [create-project/create-project.md](create-project/create-project.md)         |
| **test-playground**  | Test locally with Agents Playground, `agentsplayground`, quick testing           | [test-playground/test-playground.md](test-playground/test-playground.md)     |
| **test-teams**       | Run on Teams, devtunnel, sideload, Teams testing, test in Copilot                | [test-teams/test-teams.md](test-teams/test-teams.md)                         |
| **provision-deploy** | Provision Azure resources, deploy to cloud, `atk provision`, `atk deploy`        | [provision-deploy/provision-deploy.md](provision-deploy/provision-deploy.md) |
| **troubleshoot**     | Fix errors, 401, port conflicts, YAML errors, stale bots                         | [troubleshoot/troubleshoot.md](troubleshoot/troubleshoot.md)                 |
| **slack-to-teams**   | Migrate Slack bot to Teams, cross-platform bridging, Block Kit to Adaptive Cards | [slack-to-teams/SKILL.md](slack-to-teams/SKILL.md)                           |

> **MANDATORY:** Before executing any workflow, read the corresponding sub-skill document.

## Shared References

- [manifest-and-yaml.md](toolkit/manifest-and-yaml.md) — Project files, YAML config, env vars, .localConfigs flow
- [commands.md](toolkit/commands.md) — ATK CLI commands: package, validate, share, collaborate
- [templates.md](toolkit/templates.md) — Complete template catalog with language support
- [experts/](experts/index.md) — 100+ micro-expert files: Teams SDK, Slack SDK, cross-platform bridging, deploy, AI models, security, language conversion
- [docs/](docs/README.md) — Platform comparison guides: UI, messaging, identity, infrastructure, feature gaps

## Workflow Chains

Match user intent to the smallest valid workflow.

| User Intent                   | Workflow (read in order)                    |
| ----------------------------- | ------------------------------------------- |
| Build new app from scratch    | create-project → test-playground            |
| Test existing project locally | test-playground (recommended) or test-teams |
| Deploy to Azure               | provision-deploy                            |
| Fix broken bot                | troubleshoot → re-test                      |
| Migrate Slack bot to Teams    | slack-to-teams                              |

> **MANDATORY:** Before executing any slack-to-teams workflow, read [slack-to-teams/SKILL.md](slack-to-teams/SKILL.md) first. The sub-skill contains a routed expert system with 100+ micro-expert files for cross-platform bot development.

## ATK Project Context Resolution

Resolve config values only when missing. If a value is already known in the session, reuse it.

### Step 1: Detect ATK Project

If `m365agentstoolkit*.yml` exists in the current folder, treat it as an ATK project and parse configuration.

### Step 2: Resolve Common Configuration

Resolve variables referenced in `m365agentstoolkit*.yml`. Common variables:
AZURE_OPENAI_API_KEY
AZURE_OPENAI_ENDPOINT
AZURE_OPENAI_DEPLOYMENT_NAME

### Step 3: Collect Missing Values

If required values are missing, ask the user for only the missing ones.

Refer to [manifest-and-yaml.md](toolkit/manifest-and-yaml.md) for full config-file details.

From microsoft/skills, MIT.

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Last commit (this folder)
Jun 20, 2026 (4 months ago)

From GitHub (fetched Oct 24, 2026).

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License
MIT
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

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teams-app-developer skill. Agent Mart. https://agentmart.dev/skills/microsoft-teams-app-developer (last updated 2026-10-24)