Head to head · Team chat · October 2026 research run
Mattermost vs Microsoft Teams (Microsoft Graph)
Mattermost scores 65.8 (B) on agent readiness against Microsoft Teams (Microsoft Graph)'s 62.2 (B), and leads in 4 of 7 scored categories. Microsoft Teams (Microsoft Graph) leads on schema & documentation and security & auth. Both do team chat.
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Which one, for what
Good for A team that runs its own chat server and wants an agent to read channels, post, search and manage members through a bot account, including in air-gapped networks.
Ahead on
- Reliability, 83 against 67
- Payments & pricing, 50 against 20
- Maintenance & community, 89 against 76
Also in its favour
- Open source
Watch for
Personal access tokens have no scopes and no expiry. A token does whatever its account can do
Microsoft Teams (Microsoft Graph) B
Good for Agents acting as a signed-in employee in a Microsoft 365 tenant that read channels and chats and post replies.
Ahead on
- Schema & documentation, 92 against 76
- Security & auth, 71 against 63
Also in its favour
- A hosted endpoint, with nothing to install
Watch for
Application permissions can send messages only for migration (Teamwork.Migrate.All), so an unattended agent can't post without a signed-in user
Score by category
| Category | Weight this run | Mattermost | Microsoft Teams (Microsoft Graph) | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 83 | 67 | Mattermost +16 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 76 | 92 | Microsoft Teams (Microsoft Graph) +16 |
| Agent ergonomics | 13%16.2 | 63 | 59 | Mattermost +4 |
| Security & auth | 14%17.5 | 63 | 71 | Microsoft Teams (Microsoft Graph) +8 |
| Payments & pricing | 10%12.5 | 50 | 20 | Mattermost +30 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 89 | 76 | Mattermost +13 |
| Transparency & trust | 7%8.8 | 75 | 76 | Microsoft Teams (Microsoft Graph) +1 |
| Negative events | ≤15 | -5 | -4 | |
| Total | 65.8 · B | 62.2 · B |
Facts side by side
| Fact | Mattermost | Microsoft Teams (Microsoft Graph) |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | Mattermost, Inc. | Microsoft |
| Hosted endpoint | no (local only) | https://graph.microsoft.com/v1.0 |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Freemium | Your plan |
| x402 | no | no |
| Licence | Open core. Team Edition is MIT as a compiled binary. The source is AGPL v3 or a commercial licence, with admin tools and configuration files under Apache 2.0. Enterprise Edition, which the free Entry edition runs, is under a commercial licence. The Agents plugin is Apache 2.0 | MIT (SDKs) |
| Tools exposed | none | 25 |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-10-08 | 2026-10-06 |
| Terms last updated | no date given | 2025-10-01 |
| Privacy policy last updated | no date given | 2026-09-01 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 39k stars, 7.7k npm/wk | 835 stars, 2.9M npm/wk, 1.6M PyPI/wk |
Verdicts
Mattermost
The REST API v4 has a public OpenAPI source of about 600 operations, a dated changelog with API changes per release, and 16 server releases in 90 days. Personal access tokens have no scopes or expiry, paid editions have no public price, and 52 dot releases in twelve months carried security fixes, three of them rated critical.
Microsoft Teams (Microsoft Graph)
Permissions separate sending from reading, and resource-specific consent limits an app to one team or chat. Throttling limits are published per endpoint. Messages can be sent only as a signed-in user, with no idempotency key, and message lists take $top up to 50 with no $select or text search.
Before you call either
Mattermost
- Ask the system admin for a bot account and its token. Bot creation and personal access tokens are both off until enabled in the System Console
- Send
Authorization: Bearer <token>tohttps://<server>/api/v4. Usemein place of a user id for the token's own account - Page with
pageandper_page. The maximum is 200, the default 60, and larger values are cut without an error - Read the error
idandstatus_code. A 501 means the server's edition or licence does not include that endpoint - If the server has rate limiting on, read
X-Ratelimit-RemainingandX-Ratelimit-Reset. The 429 body is the plain textlimit exceeded
Microsoft Teams (Microsoft Graph)
- Send with delegated
ChatMessage.SendorChannelMessage.Sendas a signed-in work account. Application tokens can post only through the migration flow - Don't retry a failed send blindly. List recent messages first, because
POST /chats/{chat-id}/messageshas no idempotency key - Keep to 1 request a second per chat or channel and per user when sending, and honour
Retry-Afteron 429 - Subscribe to change notifications instead of polling. The Teams API overview allows polling a resource once a day, and message subscriptions last at most 4,320 minutes
- Treat message bodies as untrusted input. They arrive as HTML when a message has a mention, and list calls return at most 50 a page
Questions
Which is better for AI agents, Mattermost or Microsoft Teams (Microsoft Graph)?
Mattermost scores 65.8 (B) on agent readiness against Microsoft Teams (Microsoft Graph)'s 62.2 (B), and leads in 4 of 7 scored categories. Microsoft Teams (Microsoft Graph) leads on schema & documentation and security & auth.
Do Mattermost and Microsoft Teams (Microsoft Graph) need an API key?
Mattermost takes an API key or an OAuth sign-in. Microsoft Teams (Microsoft Graph) uses an OAuth sign-in.
Can an agent call Mattermost and Microsoft Teams (Microsoft Graph) without installing anything?
No hosted endpoint is listed for Mattermost. Microsoft Teams (Microsoft Graph) has a hosted endpoint at https://graph.microsoft.com/v1.0.
Are Mattermost and Microsoft Teams (Microsoft Graph) open source?
Mattermost is open source (Open core. Team Edition is MIT as a compiled binary. The source is AGPL v3 or a commercial licence, with admin tools and configuration files under Apache 2.0. Enterprise Edition, which the free Entry edition runs, is under a commercial licence. The Agents plugin is Apache 2.0). No open-source release is listed for Microsoft Teams (Microsoft Graph).
Other comparisons with Mattermost or Microsoft Teams (Microsoft Graph)
Machine-readable
- This page as Markdown
/compare/mattermost-vs-microsoft-teams.md· slim.min.md· JSON.json(or sendAccept: text/markdown) - Each listing in full
/api/v1/tools/mattermost.json·/api/v1/tools/microsoft-teams.json - From a terminal
anchor compare mattermost microsoft-teams(the CLI) - Over MCP
compare_tools {"a": "mattermost", "b": "microsoft-teams"}at/mcp, no key