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/ui-components.md

UI Components

Block Kit vs Adaptive Cards

Slack Block Kit	Adaptive Card Element	Notes
`section` (text)	`TextBlock`	Set `wrap: true`; convert `bold` mrkdwn → `bold` Markdown
`section` (fields)	`FactSet`	Each field becomes `{ title, value }`
`section` (text + accessory)	`ColumnSet` with 2 `Column`s	Col 1 = text, Col 2 = accessory
`header`	`TextBlock` size `Large`, weight `Bolder`
`actions`	`ActionSet`	Max 6 actions in Teams (vs 25 in Slack)
`divider`	`TextBlock` with `separator: true`
`image`	`Image`	`alt_text` (underscore) → `altText` (camelCase)
`context`	`TextBlock` size `Small`, `isSubtle: true`
`input` (plain_text)	`Input.Text`
`input` (static_select)	`Input.ChoiceSet` `style: "compact"`
`input` (multi_select)	`Input.ChoiceSet` `isMultiSelect: true`
`input` (datepicker)	`Input.Date`
`input` (timepicker)	`Input.Time`
`input` (checkboxes)	`Input.ChoiceSet` `style: "expanded"`, `isMultiSelect: true`
`input` (radio_buttons)	`Input.ChoiceSet` `style: "expanded"`
`rich_text`	`RichTextBlock`	Schema 1.5+
`overflow` menu	No equivalent	Redesign as `ActionSet` or `Input.ChoiceSet` dropdown

Rating: GREEN for most elements, RED for overflow menus.

Markdown Differences

Formatting	Slack mrkdwn	Adaptive Card Markdown
Bold	`bold`	`bold`
Italic	`_italic_`	`_italic_`
Strikethrough	`~strike~`	`~~strike~~`
Code	`code`	`code`
Emoji	`:emoji_shortcode:`	Unicode characters only
User mention	`<@U12345>`	Display name (no mention syntax)

Impact: Failing to convert *bold* to **bold** produces literal asterisks in Teams. Slack emoji shortcodes render as plain text in Adaptive Cards.

Mitigation: Apply a text transform function when converting between formats:

// Slack mrkdwn → Adaptive Card Markdown
text.replace(/(?<!\*)\*([^*]+)\*(?!\*)/g, "**$1**")
    .replace(/~([^~]+)~/g, "~~$1~~");

// Adaptive Card Markdown → Slack mrkdwn
text.replace(/\*\*([^*]+)\*\*/g, "*$1*")
    .replace(/~~([^~]+)~~/g, "~$1~");

Button / Action Styles

Slack	Adaptive Card	Visual
`"primary"`	`"positive"`	Green
`"danger"`	`"destructive"`	Red
(default)	`"default"`	Neutral

Interaction Model Difference

This is the biggest behavioral shift between platforms:

Aspect	Slack	Teams
Model	Event-per-interaction — every select/button fires immediately	Form-then-submit — inputs collect, submit sends all at once
Select behavior	`static_select` fires `block_actions` on selection	`Input.ChoiceSet` does nothing until `Action.Submit` clicked
Live updates	`dispatch_action: true` for real-time `block_actions`	No equivalent — use `Action.Execute` with refresh for critical cases
Form data	Per-element: `action.selected_option.value`	Batched: `activity.value` contains all input IDs

Impact: Bots that rely on instant-fire selects to update UI dynamically will feel different in Teams. The Teams UX has fewer round trips but less reactivity.

Mitigation: Accept the batch-submit model for Teams. Group related inputs and submit together. For cases requiring per-interaction updates, use Action.Execute with the refresh property (schema 1.4+).

Block / Action Limits

Limit	Slack	Teams
Blocks per message	50	No formal block limit, but 28 KB payload max
Blocks per modal/view	100	28 KB payload max
Actions per block	25 per `actions` block	6 per `ActionSet`
Card payload size	No formal limit	28 KB after JSON serialization

Mitigation: Paginate dense action rows into multiple cards. Consolidate overflow menus into Input.ChoiceSet dropdowns.

Modals vs Dialogs (Task Modules)

Aspect	Slack Modal	Teams Dialog (Task Module)
Open	`views.open(trigger_id, view)`	Return card from `dialog.open` handler
Submit handler	`app.view("callback_id")`	`app.on("dialog.submit")`
Form data location	`view.state.values[block_id][action_id]`	`activity.value.data` (flat object keyed by input `id`)
Stacking	`views.push()` — up to 3 levels	Not supported
Cancel notification	`notify_on_close: true` → `view_closed`	Not supported
Mid-form updates	`dispatch_action` + `block_actions` + `views.update`	Not supported
Field validation	`ack({ response_action: "errors", errors })`	Client-side only (`isRequired`, `regex`)
Private metadata	`private_metadata` (3000 char limit)	Hidden fields in `Action.Submit.data`
View hash (race protection)	`view_hash` parameter in `views.update`	Not supported — manual `_version` field needed

Rating: YELLOW for basic modal-to-dialog, RED for stacking, cancel notifications, and mid-form updates.

Mitigation Strategies

Gap	Strategy	Effort
No stacking	Flatten into single dialog with step routing in submit handler. Include a "Back" button that re-renders the previous step.	8–16 hrs
No cancel notification	Add explicit "Cancel" button inside the dialog. Implement 5-min timeout-based cleanup for stale locks.	4–8 hrs
No mid-form updates	Multi-step dialogs for dependent fields. `Action.ToggleVisibility` for simple show/hide.	8–16 hrs
No server-side validation	Re-open dialog with pre-populated data + error messages in field labels. Use client-side `isRequired`/`regex` where possible.	4–8 hrs
No view hash	Inject `_version` counter into `Action.Submit.data`. Reject stale updates server-side.	2–4 hrs

Reverse Direction (Teams → Slack)

Dialogs map to modals via views.open(). Teams' batch-submit model decomposes into Slack's per-element handlers. Client-side validation (isRequired, regex) becomes server-side validation in view_submission.

App Home vs Personal Tab

Aspect	Slack App Home	Teams Personal Tab
Render	`views.publish()` with Block Kit	`tab.fetch` handler returns Adaptive Card, or `staticTabs` in manifest for web
Trigger	`app_home_opened` event	`tab.fetch` fires on every tab open
Dynamic updates	`views.publish()` any time	`tab.submit` for interactions within tab
Race protection	`view_hash` parameter	Not supported

Rating: YELLOW — functional equivalent exists, different event model.

Mitigation Strategies

Strategy	How	Effort
`tab.fetch` handler (Recommended)	Return Adaptive Card on every tab open. Closest to `app_home_opened`.	4–8 hrs
Welcome message only	Send card to 1:1 chat on `install.add`. Simple but fires once.	1–2 hrs
Static web tab	Full web page in iframe. Richer UI but needs hosting.	8–16 hrs

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/ui-components.md

UI Components

Block Kit vs Adaptive Cards

Markdown Differences

Button / Action Styles

Interaction Model Difference

Block / Action Limits

Modals vs Dialogs (Task Modules)

Mitigation Strategies

Reverse Direction (Teams → Slack)

App Home vs Personal Tab

Mitigation Strategies

Requirements and compatibility

Security

Attribution and licence

Related skills

Implement Spec

MCP Builder

Schema

Postgresql Table Design

SQL Optimization Patterns

API Scaffolding Fastapi Pro

Download ZIP