Teams App Developer

MicrosoftOfficialPublished by Microsoft

Skill
Tool integration
Software development
MIT
Medium risk

From the author

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.

— the description by Microsoft

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

The teams-app-developer skill provides a structured framework for managing the lifecycle of Microsoft 365 agents and Teams applications. It leverages the ATK CLI to handle project scaffolding, local testing via the Agents Playground, cloud provisioning on Azure, and troubleshooting. The skill includes specialized guidance for migrating Slack bots to Teams, including converting Block Kit UI to Adaptive Cards, and provides access to an extensive library of micro-expert documentation for cross-platform development.

What it does

Scaffolds new Microsoft 365 agents and Teams applications from templates.
Facilitates local testing using the Agents Playground or Teams-specific environments.
Automates Azure resource provisioning and cloud deployment workflows.
Provides diagnostic procedures for common authentication and configuration errors.
Supports migration of Slack bots to the Teams platform.
Manages project configuration and environment variables for ATK-based projects.

When to use it

When starting a new Teams app, bot, or Declarative Agent project.
When you need to test an agent locally before deploying to the cloud.
When migrating existing Slack bots to the Microsoft Teams ecosystem.
When troubleshooting deployment or authentication issues in a Teams project.
When you need to provision Azure infrastructure for a Teams application.

Advantages

Streamlines the development lifecycle with standardized CLI commands.
Reduces development time by offering a local testing playground.
Provides expert-level guidance for complex cross-platform migrations.
Ensures consistent configuration management across development environments.
Includes robust error-handling protocols for common platform-specific pitfalls.

Usage examples

“Create a new Teams bot project using the default template.”: The agent will initialize a new project folder, configure the necessary YAML files, and guide you through the initial setup using the ATK CLI.
“How do I migrate my Slack bot to Microsoft Teams?”: The agent will initiate the slack-to-teams workflow, providing access to cross-platform bridging experts and guidance on converting UI components.
“My Teams bot is returning a 401 error, how do I fix it?”: The agent will trigger the troubleshooting workflow, checking your environment variables, tunnel status, and authentication configuration.

Install

Download the skill as a ZIP:
https://mp-staging.autogineer.com/agent-skills/microsoft/teams-app-developer/download

Unzip it into the cross-client skills folder of your project:

mkdir -p .agents/skills && unzip teams-app-developer.zip -d .agents/skills

Documentation by Microsoft

Microsoft 365 Agents Toolkit Skill

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

AI Behavior Guidelines

Testing Strategy: Recommend Agents Playground first (faster, no M365 needed). Use Teams workflow only if user explicitly requests it.
Environment Variables: NEVER hardcode secrets or make up placeholder values. Always ask users for real values.
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 for full diagnostic steps
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+)
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
Monitor App Logs: Periodically check background terminal output for runtime errors. If the app crashes, read the error, fix the root cause, and restart.
Telemetry Tagging: Before running any atk CLI commands, set the session environment variable so all CLI invocations are tagged as skill-initiated:
```
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

atk --version  # Must be > 1.1.5-beta

If ATK is not found or version is too old:

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
test-playground	Test locally with Agents Playground, `agentsplayground`, quick testing	test-playground/test-playground.md
test-teams	Run on Teams, devtunnel, sideload, Teams testing, test in Copilot	test-teams/test-teams.md
provision-deploy	Provision Azure resources, deploy to cloud, `atk provision`, `atk deploy`	provision-deploy/provision-deploy.md
troubleshoot	Fix errors, 401, port conflicts, YAML errors, stale bots	troubleshoot/troubleshoot.md
slack-to-teams	Migrate Slack bot to Teams, cross-platform bridging, Block Kit to Adaptive Cards	slack-to-teams/SKILL.md

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

Shared References

manifest-and-yaml.md — Project files, YAML config, env vars, .localConfigs flow
commands.md — ATK CLI commands: package, validate, share, collaborate
templates.md — Complete template catalog with language support
experts/ — 100+ micro-expert files: Teams SDK, Slack SDK, cross-platform bridging, deploy, AI models, security, language conversion
docs/ — 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 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 for full config-file details.

Files

ATTRIBUTION.mdAdded by AutoGineer906 B
LICENSELicence file added by AutoGineer1.1 KiB
SKILL.md7.6 KiB
create-project/create-project.md8.1 KiB
docs/README.md2.8 KiB
docs/advanced-features.md7.0 KiB
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docs/infrastructure.md6.7 KiB
docs/interactive-responses.md4.4 KiB
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experts/README.md8.6 KiB
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docs/interactive-responses.md

Interactive Responses

Ephemeral Messages

Aspect	Slack	Teams
User-only messages	`chat.postEphemeral()` or `respond({ response_type: "ephemeral" })`	No native equivalent
Per-user card views	Not available (use ephemeral messages)	`Action.Execute` with `refresh.userIds`
Default command response	Ephemeral	Visible to everyone

Rating: RED (Slack → Teams), GREEN (Teams → Slack).

Impact

Any Slack bot that uses ephemeral messages for user-only feedback — confirmation dialogs, error messages, inline help — has no direct Teams equivalent. Messages are visible to everyone unless workarounds are used.

Mitigation Strategies (Slack → Teams)

Strategy	How	Effort
`refresh.userIds` (Recommended)	Adaptive Cards with `Action.Execute` and `refresh.userIds` show different card content per user. Covers ~80% of cases. Limited to 60 user IDs.	4–8 hrs
1:1 chat fallback	Route ephemeral content to user's personal bot chat via proactive messaging. Different UX (separate conversation) but reliable.	2–4 hrs
`sendEphemeral()` helper	Wrapper that auto-detects context and picks the best strategy. Worth it if reused across multiple handlers.	8–12 hrs
Drop ephemeral behavior	Show messages to everyone. Simplest but may expose private data.	0 hrs

Reverse Direction (Teams → Slack)

refresh.userIds per-user card views map to Slack's native ephemeral messages. Use chat.postEphemeral() directly.

Message Updates and Replacements

Aspect	Slack	Teams
Replace original	`respond({ replace_original: true })`	Return card from invoke handler, or `ctx.updateActivity(activityId)`
Delete original	`respond({ delete_original: true })`	`ctx.deleteActivity(activityId)`
Update by ID	`chat.update({ ts, channel, ... })`	`ctx.updateActivity({ id: activityId, ... })`
Response URL	`response_url` — valid 30 min, max 5 uses	No equivalent concept
Activity ID	`message.ts` (timestamp-based)	`activity.id` or `activity.replyToId`

Rating: GREEN — direct mapping with different API shapes.

Key Difference

Slack uses response_url (a webhook URL that expires after 30 minutes and allows up to 5 responses). Teams has no response_url — you update messages by storing and referencing the activity.id.

Mitigation: Store the activity.id when sending messages that may need updating. Use ctx.updateActivity() with the stored ID.

Button Actions

Aspect	Slack	Teams
Handler registration	`app.action("action_id", handler)`	`app.on("card.action", handler)` routing on `data.action`
Action identifier	`action_id` on button element	`data.action` (or `data.verb`) in `Action.Submit`
Button value	`action.value`	`activity.value.action.data`
Acknowledgement	Must `ack()` within 3 seconds	Automatic
Follow-up response	`respond()` (response_url)	`ctx.send()` or `ctx.updateActivity()`

Rating: GREEN — direct mapping with different routing mechanisms.

Mitigation: In Slack, each button has a unique action_id with its own handler. In Teams, all Action.Submit buttons route through card.action; use a data.action field to dispatch:

// Teams — route by data.action
app.on("card.action", async (ctx) => {
  const action = ctx.activity.value?.action?.data?.action;
  switch (action) {
    case "approve": /* ... */ break;
    case "reject":  /* ... */ break;
  }
});

Confirmation Dialogs

Aspect	Slack	Teams
Native support	`confirm` object on button elements	No native equivalent
Behavior	Platform-rendered "Are you sure?" popup	Must be built manually

Rating: YELLOW (Slack → Teams), GREEN (Teams → Slack).

Mitigation Strategies (Slack → Teams)

Strategy	How	Effort
`Action.ShowCard` inline (Recommended)	Inline expand with "Are you sure?" text and Yes/No buttons. Native Adaptive Card pattern.	2–4 hrs
Task module confirm	Small dialog popup for confirmation. More prominent, closer to Slack UX.	4–6 hrs
`confirmAction()` helper	Template function generating confirm cards. Reusable across multiple buttons.	4–8 hrs

Reverse Direction (Teams → Slack)

Use the native confirm object on button elements. Built-in, no custom code needed.

Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs an API key, Needs Python, Needs Node.js

Security

What our scanner noticed· Medium risk

Possible data-exfiltration endpoints
Instructions that use the network
Downloads piped into a shell

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Published by

Microsoft

Publisher

Microsoft (Official)

Source

microsoft/skills · .github/plugins/microsoft-365-agents-toolkit/skills/teams-app-developer · commit 0696600

Licence

MIT License (redistribution allowed)

LICENSE (added by AutoGineer from LICENSE)
ATTRIBUTION.md (written by AutoGineer)

Synced

2026-11-08

AutoGineer is not affiliated with or endorsed by Microsoft.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download teams-app-developer.zip

From the author

AutoGineer summary

What it does

When to use it

Advantages

Usage examples

Install

Documentation by Microsoft

Microsoft 365 Agents Toolkit Skill

AI Behavior Guidelines

ATK CLI Setup

CLI Global Options

Sub-Skills

Shared References

Workflow Chains

ATK Project Context Resolution

Step 1: Detect ATK Project

Step 2: Resolve Common Configuration

Step 3: Collect Missing Values

Files

docs/interactive-responses.md

Interactive Responses

Ephemeral Messages

Impact

Mitigation Strategies (Slack → Teams)

Reverse Direction (Teams → Slack)

Message Updates and Replacements

Key Difference

Button Actions

Confirmation Dialogs

Mitigation Strategies (Slack → Teams)

Reverse Direction (Teams → Slack)

Requirements and compatibility

Security

Attribution and licence

Related skills

Implement Spec

MCP Builder

Schema

Postgresql Table Design

SQL Optimization Patterns

API Scaffolding Fastapi Pro

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