mm-mcp for Mattermost MCP server

by vriesdemichael·io.github.vriesdemichael/mm-mcp·v0.4.1

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B73/100grade B

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If you have run it, two minutes of your experience saves the next person an afternoon.

mm-mcp for Mattermost tools

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How mm-mcp for Mattermost compares

Against every graded Web search MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 73/100; higher than 42% of 3,470 Web search servers

Release history: 4 versions in the registry since 2026-10-09, latest 2026-10-30, typically one every 9 days.

Install mm-mcp for Mattermost in Claude Code, Cursor or VS Code

The registry entry has no remote endpoint or installable package.

mm-mcp for Mattermost: common questions

Is mm-mcp for Mattermost MCP server safe?: Mostly: it is graded B (73/100). Read the mm-mcp for Mattermost safety report
Does mm-mcp for Mattermost need an API key?: Yes. The registry entry asks for MM_TOKEN.
Is mm-mcp for Mattermost maintained?: The last commit was 26 days ago (2026-10-09). The latest release is v0.4.1.
What can I use instead of mm-mcp for Mattermost?: Servers from other publishers that do the same job: Reddit MCP server and Reddit Buddy MCP server.

Alternatives to mm-mcp for Mattermost

Same job from other publishers: the closest match first, then the best rated.

Reddit
Reddit MCP server with full read/write - posts, comments, search, and content creation.
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Reddit Buddy
Reddit MCP server - browse posts, search content, analyze users.
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Run it through the gateway

Local package. It runs on your machine, not through the gateway.

Rating: —
Safety grade: B · 73/100
Stars: 0
Downloads/wk: –
Price: Free
Licence: Apache-2.0
Transport: Local · mcpb
Version: 0.4.1
Category: Web search
Last release: 2026-10-09

Credentials it needs

MM_MCP_ALLOW_WRITESOffer the tools that post and change things. Your client's own approval of each call decides, and mm-mcp checks what each change others see states before it acts.
MM_MCP_CA_FILEA PEM file of certificate authorities to trust beside your system's, for a Mattermost whose certificate your organisation signed itself. Leave it empty otherwise.
MM_MCP_DOWNLOAD_DIRWhere save_file writes attachments. Leave it empty for your Downloads directory.
MM_MCP_ELICITATION_OPT_INYour client's own approval of each call decides whether a post or another change others see goes ahead, and mm-mcp checks what each states. Turn this on to have mm-mcp ask you too, through a question your client shows: a convenience where it shows it, not a safeguard, since some clients answer it themselves.
MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODENot with mm-mcp asks as well: marks each tool that changes what others see so that Claude Code asks a person on every call, whatever its permission mode or rules allow. An agent cannot post on its own while it is on.
MM_MCP_MARK_AI_GENERATEDMark every post and edit the model writes with Mattermost's own marker for text written with AI.
MM_MCP_POST_FROM_VIEWSWhere your app shows mm-mcp's views, a post the model proposes as your draft can be posted from the view with Post. Off, the draft waits in Mattermost for you to send.
MM_MCP_RESOURCE_MAX_MBThe most one message carrying an attached file as an MCP resource holds, a binary file counted as its base64. MCP sends a resource whole, and a client drops a message past its own limit, 10 MB for clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit.
MM_TOKENsecretA personal access token or a bot token. Where those are switched off, leave it empty after logging in once with mm-mcp login --url <address> in a terminal, which keeps your session in the system's credential store.
MM_URLThe address you open Mattermost at, such as https://chat.example.com.
MM_MCP_ALLOW_WRITESOffer the tools that post and change things. Your client's own approval of each call decides, and mm-mcp checks what each change others see states before it acts.
MM_MCP_CA_FILEA PEM file of certificate authorities to trust beside your system's, for a Mattermost whose certificate your organisation signed itself. Leave it empty otherwise.
MM_MCP_DOWNLOAD_DIRWhere save_file writes attachments. Leave it empty for your Downloads directory.
MM_MCP_ELICITATION_OPT_INYour client's own approval of each call decides whether a post or another change others see goes ahead, and mm-mcp checks what each states. Turn this on to have mm-mcp ask you too, through a question your client shows: a convenience where it shows it, not a safeguard, since some clients answer it themselves.
MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODENot with mm-mcp asks as well: marks each tool that changes what others see so that Claude Code asks a person on every call, whatever its permission mode or rules allow. An agent cannot post on its own while it is on.
MM_MCP_MARK_AI_GENERATEDMark every post and edit the model writes with Mattermost's own marker for text written with AI.
MM_MCP_POST_FROM_VIEWSWhere your app shows mm-mcp's views, a post the model proposes as your draft can be posted from the view with Post. Off, the draft waits in Mattermost for you to send.
MM_MCP_RESOURCE_MAX_MBThe most one message carrying an attached file as an MCP resource holds, a binary file counted as its base64. MCP sends a resource whole, and a client drops a message past its own limit, 10 MB for clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit.
MM_TOKENsecretA personal access token or a bot token. Where those are switched off, leave it empty after logging in once with mm-mcp login --url <address> in a terminal, which keeps your session in the system's credential store.
MM_URLThe address you open Mattermost at, such as https://chat.example.com.
MM_MCP_ALLOW_WRITESOffer the tools that post and change things. Your client's own approval of each call decides, and mm-mcp checks what each change others see states before it acts.
MM_MCP_CA_FILEA PEM file of certificate authorities to trust beside your system's, for a Mattermost whose certificate your organisation signed itself. Leave it empty otherwise.
MM_MCP_DOWNLOAD_DIRWhere save_file writes attachments. Leave it empty for your Downloads directory.
MM_MCP_ELICITATION_OPT_INYour client's own approval of each call decides whether a post or another change others see goes ahead, and mm-mcp checks what each states. Turn this on to have mm-mcp ask you too, through a question your client shows: a convenience where it shows it, not a safeguard, since some clients answer it themselves.
MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODENot with mm-mcp asks as well: marks each tool that changes what others see so that Claude Code asks a person on every call, whatever its permission mode or rules allow. An agent cannot post on its own while it is on.
MM_MCP_MARK_AI_GENERATEDMark every post and edit the model writes with Mattermost's own marker for text written with AI.
MM_MCP_POST_FROM_VIEWSWhere your app shows mm-mcp's views, a post the model proposes as your draft can be posted from the view with Post. Off, the draft waits in Mattermost for you to send.
MM_MCP_RESOURCE_MAX_MBThe most one message carrying an attached file as an MCP resource holds, a binary file counted as its base64. MCP sends a resource whole, and a client drops a message past its own limit, 10 MB for clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit.
MM_TOKENsecretA personal access token or a bot token. Where those are switched off, leave it empty after logging in once with mm-mcp login --url <address> in a terminal, which keeps your session in the system's credential store.
MM_URLThe address you open Mattermost at, such as https://chat.example.com.
MM_MCP_ALLOW_WRITESOffer the tools that post and change things. Your client's own approval of each call decides, and mm-mcp checks what each change others see states before it acts.
MM_MCP_CA_FILEA PEM file of certificate authorities to trust beside your system's, for a Mattermost whose certificate your organisation signed itself. Leave it empty otherwise.
MM_MCP_DOWNLOAD_DIRWhere save_file writes attachments. Leave it empty for your Downloads directory.
MM_MCP_ELICITATION_OPT_INYour client's own approval of each call decides whether a post or another change others see goes ahead, and mm-mcp checks what each states. Turn this on to have mm-mcp ask you too, through a question your client shows: a convenience where it shows it, not a safeguard, since some clients answer it themselves.
MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODENot with mm-mcp asks as well: marks each tool that changes what others see so that Claude Code asks a person on every call, whatever its permission mode or rules allow. An agent cannot post on its own while it is on.
MM_MCP_MARK_AI_GENERATEDMark every post and edit the model writes with Mattermost's own marker for text written with AI.
MM_MCP_POST_FROM_VIEWSWhere your app shows mm-mcp's views, a post the model proposes as your draft can be posted from the view with Post. Off, the draft waits in Mattermost for you to send.
MM_MCP_RESOURCE_MAX_MBThe most one message carrying an attached file as an MCP resource holds, a binary file counted as its base64. MCP sends a resource whole, and a client drops a message past its own limit, 10 MB for clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit.
MM_TOKENsecretA personal access token or a bot token. Where those are switched off, leave it empty after logging in once with mm-mcp login --url <address> in a terminal, which keeps your session in the system's credential store.
MM_URLThe address you open Mattermost at, such as https://chat.example.com.
MM_MCP_ALLOW_WRITESOffer the tools that post and change things. Your client's own approval of each call decides, and mm-mcp checks what each change others see states before it acts.
MM_MCP_CA_FILEA PEM file of certificate authorities to trust beside your system's, for a Mattermost whose certificate your organisation signed itself. Leave it empty otherwise.
MM_MCP_DOWNLOAD_DIRWhere save_file writes attachments. Leave it empty for your Downloads directory.
MM_MCP_ELICITATION_OPT_INYour client's own approval of each call decides whether a post or another change others see goes ahead, and mm-mcp checks what each states. Turn this on to have mm-mcp ask you too, through a question your client shows: a convenience where it shows it, not a safeguard, since some clients answer it themselves.
MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODENot with mm-mcp asks as well: marks each tool that changes what others see so that Claude Code asks a person on every call, whatever its permission mode or rules allow. An agent cannot post on its own while it is on.
MM_MCP_MARK_AI_GENERATEDMark every post and edit the model writes with Mattermost's own marker for text written with AI.
MM_MCP_POST_FROM_VIEWSWhere your app shows mm-mcp's views, a post the model proposes as your draft can be posted from the view with Post. Off, the draft waits in Mattermost for you to send.
MM_MCP_RESOURCE_MAX_MBThe most one message carrying an attached file as an MCP resource holds, a binary file counted as its base64. MCP sends a resource whole, and a client drops a message past its own limit, 10 MB for clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit.
MM_TOKENsecretA personal access token or a bot token. Where those are switched off, leave it empty after logging in once with mm-mcp login --url <address> in a terminal, which keeps your session in the system's credential store.
MM_URLThe address you open Mattermost at, such as https://chat.example.com.
MM_MCP_ALLOW_WRITESOffer the tools that post and change things. Your client's own approval of each call decides, and mm-mcp checks what each change others see states before it acts.
MM_MCP_CA_FILEA PEM file of certificate authorities to trust beside your system's, for a Mattermost whose certificate your organisation signed itself. Leave it empty otherwise.
MM_MCP_DOWNLOAD_DIRWhere save_file writes attachments. Leave it empty for your Downloads directory.
MM_MCP_ELICITATION_OPT_INYour client's own approval of each call decides whether a post or another change others see goes ahead, and mm-mcp checks what each states. Turn this on to have mm-mcp ask you too, through a question your client shows: a convenience where it shows it, not a safeguard, since some clients answer it themselves.
MM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODENot with mm-mcp asks as well: marks each tool that changes what others see so that Claude Code asks a person on every call, whatever its permission mode or rules allow. An agent cannot post on its own while it is on.
MM_MCP_MARK_AI_GENERATEDMark every post and edit the model writes with Mattermost's own marker for text written with AI.
MM_MCP_POST_FROM_VIEWSWhere your app shows mm-mcp's views, a post the model proposes as your draft can be posted from the view with Post. Off, the draft waits in Mattermost for you to send.
MM_MCP_RESOURCE_MAX_MBThe most one message carrying an attached file as an MCP resource holds, a binary file counted as its base64. MCP sends a resource whole, and a client drops a message past its own limit, 10 MB for clients built on the TypeScript SDK. A larger one is refused, and read_file or save_file reads it instead. 0 is no limit.
MM_TOKENsecretA personal access token or a bot token. Where those are switched off, leave it empty after logging in once with mm-mcp login --url <address> in a terminal, which keeps your session in the system's credential store.
MM_URLThe address you open Mattermost at, such as https://chat.example.com.

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