Mattermost MCP. Audit messages, search every channel, and manage users.
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Mattermost (Secure Team Collaboration) gives your AI client deep control over your internal chat system. You can send messages, search hidden channels using `search_channels`, retrieve message timelines via `get_channel_posts`, and audit user roles across the whole workspace.
It’s for managing critical team comms when you need to know who said what and why.
What your AI agents can do
Create post
Sends a formatted Markdown payload to any specific Mattermost channel.
Delete post
Removes an explicit text post from the Mattermost arrays, making it invisible across clients.
Get all users
Returns a list of user IDs and their roles, allowing you to accurately tag mentions for all human and bot accounts.
Dispatch formatted Markdown posts directly into a target Mattermost channel.
Use fuzzy search to locate hidden or public channels across your entire team infrastructure.
Retrieve the exact chronological sequence of messages from specified channels.
List all active users, confirming their Human/Bot status and specific IDs needed for accurate mentions.
Enumerate the organization's teams and channels to map out deep-level routing architectures.
Change the content of existing posts (like adding an '(edited)' stamp) or completely vaporize them off the platform arrays.
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Supported MCP Clients
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Mattermost (Secure Team Collaboration) MCP Server: 10 Tools for Chat Ops
These tools let your agent interact with every core part of Mattermost: sending messages, finding channels, listing users, and auditing activity.
019d75d0create post
Sends a formatted Markdown payload to any specific Mattermost channel.
019d75d0delete post
Removes an explicit text post from the Mattermost arrays, making it invisible across clients.
019d75d0get all users
Returns a list of user IDs and their roles, allowing you to accurately tag mentions for all human and bot accounts.
019d75d0get channel details
Pulls deep internal properties about a specific Mattermost channel node.
019d75d0get channel posts
Retrieves the complete timeline matrix of messages for a given channel.
019d75d0get team members
Lists all user capabilities currently attached to a specific Mattermost team.
019d75d0get teams
Identifies the global Mattermost workspace teams, providing the necessary IDs for routing requests.
019d75d0list team channels
Scans a core enterprise context to list all public channels belonging to a team.
019d75d0search channels
Aggressively searches the database to find both hidden and public Mattermost channels.
019d75d0update post
Changes the literal text content of an existing message while keeping the audit timestamps visible.
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Make Your AI Do More
Start with Mattermost (Secure Team Collaboration), then connect any of our 4,700+ other servers whenever your AI needs more. One click, no limits.
- Use this MCP plus 4,700+ others, all in one place
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What you can do with this MCP connector
Mattermost MCP Server - Manage Teams & Audit Comms gives your AI client deep, granular control over your entire Mattermost workspace. Forget just sending a quick message; this server lets your agent act like an administrator for your whole team—it's serious comms management when you need to know who said what and exactly why.
Message Control & Revision
Your AI client can send formatted Markdown posts right into any specific Mattermost channel using create_post. You’ve got total control over the message lifecycle: if a post needs fixing, update_post lets you change the text content of an existing message while keeping the original audit timestamps visible. If something gets said that shouldn't be there, delete_post removes an explicit text post from the Mattermost arrays, making it invisible across all connected clients.
You can also use get_channel_details to pull deep internal properties about a specific channel node when you need more than just the name.
Mapping Out Your Comms Structure
Finding where stuff lives in a big company is half the battle, and this server handles that mess. You can use search_channels to aggressively search your entire database, finding both hidden and public Mattermost channels regardless of how deep they are buried. To map out your whole infrastructure, you first run get_teams which identifies every global workspace team in Mattermost, providing the core IDs necessary for routing any request.
From there, you can use list_team_channels to scan a specific core enterprise context and list all public channels attached to that team. If you need to know who's on board with a particular group, get_team_members lists every user capability currently attached to a specified Mattermost team. For maximum visibility into the organization’s sheer size, get_all_users returns a complete list of user IDs and their roles, letting your agent accurately tag mentions for everything—human accounts or bot services.
Auditing & Message History
When compliance or project status is on the line, you need records that can’t be argued with. get_channel_posts retrieves the complete timeline matrix of every single message posted in a given channel. This allows your agent to pull the exact chronological sequence of messages, letting you check project status or run full audit reports.
You can verify team membership by listing all user capabilities using get_team_members. By combining these tools, you're not just reading history; you're building an auditable record that confirms roles and communication threads across the entire system. Your AI client uses this data to understand deep-level routing architectures, letting you pinpoint exactly which team owns which channel, down to the smallest detail.
How Mattermost MCP Works
- 1 First, subscribe to this server and provide your Mattermost Host URL and Personal Access Token.
- 2 Next, activate the connection within your preferred AI client (Claude, Cursor, etc.).
- 3 Finally, tell your agent what you need—for example: 'List all teams and then search for the #security-alerts channel in that team.' The agent runs the tools.
The bottom line is: You manage your secure workspace by talking to your AI client, not by clicking through web dashboards.
Who Is Mattermost MCP For?
IT Ops Engineers and Security Analysts. This server is for the person who spends too much time in Mattermost doing manual audits or searching threads across siloed teams. You need to know if a piece of communication happened, who sent it, and what its exact context was—and you don't have time to click through 15 different channels.
Uses get_team_members and timeline inspection to audit channel memberships or investigate message histories for compliance.
Monitors server activity, identifies required UUIDs using get_teams, and sends automated system alerts via natural conversation.
Coordinates team updates by searching historical technical discussions across multiple Mattermost channels efficiently.
What Changes When You Connect
- You get instant access to message history. Instead of clicking through dozens of threads, use
get_channel_poststo pull the exact chronological graph for project status checks. - Stop guessing who's in a group. Use
get_all_usersto confirm user IDs and roles before sending an automated ping or mention, ensuring your message hits the right person. - Find that lost channel instantly. If you forget if it was public or private, run
search_channels. It scans everything so you don't waste time navigating manual loops. - Maintain compliance without losing data. Need to change a post but keep the record? Use
update_postto substitute content while preserving the original audit timestamp. - Map your whole org structure in minutes. Using
get_teamsandlist_team_channelslets you quickly map out every workspace container, which is key for automated routing.
Real-World Use Cases
Investigating a data leak.
A security analyst needs to know if sensitive client data was mentioned in a side channel. They ask their agent: 'Find all messages mentioning 'Project Phoenix' and list the channels.' The agent uses search_channels and then runs get_channel_posts on every result, giving the analyst an immediate audit trail.
Updating project specs post-meeting.
An engineering lead finished a meeting and needs to update a critical specification in the #tech-spec channel. They prompt: 'Update the spec for auth endpoints with version 3 details.' The agent uses update_post, guaranteeing the edit is logged and visible while keeping the original post structure.
Onboarding new team members.
An HR manager needs to confirm every person has access. They ask: 'Show me all users in the Engineering department and list their roles.' The agent uses get_team_members combined with get_all_users, providing a comprehensive, auditable roster right away.
Routing an automated alert.
An IT Ops engineer needs to notify three specific groups about server downtime. They ask: 'Get the UUIDs for the Security and DevOps teams.' The agent runs get_teams first, then uses those IDs with list_team_channels to target the exact channels.
The Tradeoffs
Assuming a channel exists.
The user tries to send a message directly to '#project-alpha' but it fails because the team moved it or it was private. They waste time asking, 'What channel is that?'
→
Don't assume location. First, run search_channels using keywords like 'Project Alpha.' This finds the correct ID whether the channel is public or hidden.
Missing user context.
The user tries to ping a colleague by just typing '@john' but fails because Mattermost needs the absolute User ID, not just the username. The message goes nowhere.
→
Always check who's on the server first. Use get_all_users to get John Doe’s precise User ID. Then tell your agent to send a mention using that ID.
Trying to find an old discussion.
A user wants to know what was decided about the database migration two months ago, but they only remember the general topic and don't know the channel name. They spend hours clicking through archives.
→
Run search_channels with keywords like 'database migration.' This finds potential channels; then use get_channel_posts to pull the message graph from the most relevant one.
When It Fits, When It Doesn't
Use this MCP Server if your workflow requires deep visibility into who said what, and where. If you need to perform compliance audits, map out team structures, or interact with messages/users programmatically (i.e., via an agent), this is the right tool. Don't use it if all you need is basic messaging—a simple chat client might suffice. You shouldn't use get_channel_details just because you want to know a channel's name; that function pulls deep, internal properties needed for advanced routing logic only.
Basically: If the task requires moving beyond surface-level conversation and involves auditing or structured data retrieval (like UUIDs), this server is essential. It’s built for system control, not just chatting.
Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Mattermost. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.
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Works with Claude, ChatGPT, Cursor, and more
The Model Context Protocol standardizes how applications expose capabilities to LLMs. Instead of operating in isolation, your AI gains direct access to external platforms, live data, and real-world actions through secure, standardized connections.
This server provides 10 capabilities that interface natively with Claude, ChatGPT, Cursor, and any MCP client. No middleware. No custom integration required.
Available Capabilities
Sifting through Mattermost threads shouldn't feel like detective work.
Right now, if you need to know the status of a project discussion, you have to navigate. You open the channel, scroll back weeks, click on related discussions in other tabs, and copy-paste key decisions into a separate document. It's slow, it's manual, and half the context gets lost.
With this MCP server, your agent handles that whole mess. Just tell it: 'What were the final specs for Project X?' The agent runs `get_channel_posts` across multiple channels you specify, pulling up a clean, chronological message graph instantly. You get the answer without leaving your chat window.
Mattermost (Secure Team Collaboration) MCP Server: Control Posts and Members
You no longer have to wait for a human to manually update a document or delete an accidentally shared file. If you need the message changed, you use `update_post`. If it needs to vanish entirely—gone from all views—you run `delete_post`.
This capability means your team's communication is predictable and auditable. The agent manages content changes at the source, ensuring that every edit or deletion is traceable, keeping your compliance records clean.
Common Questions About Mattermost MCP
How do I use `get_all_users` with Mattermost? +
You run get_all_users to receive an array of all User IDs and their roles. This list is crucial because it lets your agent properly address users using absolute database entries, bypassing simple username spoofing.
Can I find a private channel with `search_channels`? +
Yes. The search_channels tool aggressively scans the entire Mattermost database, meaning it finds both public and hidden channels, even if you don't know their exact name.
What is the best way to check team structure with this server? +
Start by calling get_teams to identify all global workspaces. Then, use list_team_channels and get_team_members sequentially to map out the full hierarchy.
How does `update_post` work? +
update_post allows you to change existing message content. It automatically appends an '(edited)' timestamp, which preserves critical audit compliance while allowing you to correct mistakes.
What information do I need when using `get_teams`? +
You must provide your Mattermost Host URL and a Personal Access Token. The system uses these credentials to authenticate against your instance, allowing it to enumerate all global workspace (Team) underlying endpoints.
Does `delete_post` truly remove content, or does it just hide it? +
The tool irreversibly vaporizes the post off Mattermost arrays. It changes an internal marker that removes visibility across all clients and leaves no front-end trace, ensuring the deletion is system-level.
Why is `get_all_users` necessary for accurate message routing? +
get_all_users returns explicit user ID mapping arrays. This process bypasses username spoofing by querying absolute database entries via API v4, guaranteeing that mentions hit the correct person.
How does `get_channel_posts` handle historical data retrieval? +
The function retrieves an exact timeline matrix of messages. For large channels, it processes posts chronologically and uses pagination logic to ensure you can pull comprehensive history without hitting API limits.
Does this work with self-hosted Mattermost instances? +
Yes. You just need to provide your full Mattermost Host URL (e.g., https://mattermost.your-company.com). Your agent will connect securely to your private instance using your Personal Access Token.
How do I create a message in a specific channel using my agent? +
Use the create_post tool by providing the Target Channel UUID and your message in Markdown. Your agent will dispatch the payload immediately, allowing you to ping specific users using standard @mentions.
Can my agent search for channels I'm not currently watching? +
Absolutely. Use the search_channels tool with a search term. Your agent will perform a fuzzy search across your team's public and private (accessible) channels to identify the correct ID for your next operation.
Use it with your favorite AI tools
Connect this server to Cursor, Claude, VS Code, and more.
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