Mattermost MCP Server (runotwo/mattermost-mcp) is an MCP server listed on the M8ven Trust Index. It scores 56 out of 100, grade D. It declares 19 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
D
Caution
56/100

Mattermost MCP Server

MCP server for Mattermost with 19 tools to manage channels, messages, search, direct messages, users, files, and reactions.

→ runotwo/mattermost-mcp· listed on glama

Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

Code Verified⚡ Live Monitored: not connected

Verified is a snapshot. Live keeps it current, and builds your track record.

⚡ Connect GitHub → continuous verification on every pushwhy connect →

Who stands behind it

runotwo

Source: Glama

Is this your MCP?

Claim it to get a verified publisher badge, a free copy of our full audit findings, and direct contact for any high-priority issues we find. Or connect your repo for our deepest verification, Live Monitored: read-only, revoke anytime. What we access →

⚡ Connect GitHub for Live Monitored

Install from

Glamanot scored here

The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.

// key findings
⚠️
Known vulnerabilities in dependencies: 3 high
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
🔐
You'll be asked for 3 credentials: MM_PASSWORD, MM_TOKEN, MM_TOTP_SECRET
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// tools this server exposes19 tools

These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.

list_channels

List public channels in the team

list_my_channels

List channels I am a member of

get_channel_info

Get information about a channel by ID or name

get_channel_history

Get recent messages from a channel

post_message

Post a message to a channel

reply_to_message

Reply to a specific message in a thread

list_direct_channels

List my direct message channels

get_direct_messages

Get message history from a direct message channel

send_direct_message

Send a direct message to a user

search_messages

Search messages by text across channels

get_thread

Get all messages in a thread (replies to a root post)

add_reaction

Add an emoji reaction to a message

get_file_info

Get information about an attached file

download_file

Download a file attachment from Mattermost and save it locally

list_teams

List teams I belong to

get_team_info

Get information about a team

list_users

List users in the system

get_user_info

Get user info by ID, username, or email

get_user_status

Get user online/offline status

// known CVEs in dependencies3 high

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

high@modelcontextprotocol/sdk@1.12.1GHSA-345p-7cg4-v4c7

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

high@modelcontextprotocol/sdk@1.12.1GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.12.1GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

Depend on this server? Get alerted when its CVEs change.Watch this server free →
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
🔐 secretMM_PASSWORD"": "your_password",
🔐 secretMM_TOKEN"": "your_personal_access_token"
🔐 secretMM_TOTP_SECRET"": "YOUR_BASE32_TOTP_SECRET"
configMM_URL"": "https://your-mattermost.example.com",
configMM_USERNAME"": "your_username",
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

19/19 tools missing one or more hints — list_channels (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_my_channels (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_channel_info (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +16 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool inputs are validated

16/19 tool handlers declare input schemas (84%)

Declare an inputSchema with zod/joi/yup on every tool definition.

Tool handlers catch errors

Only 0/19 tool handlers wrap calls in try/catch (0%)

Wrap each tool handler body in try/catch and return a structured error response.

License file

No license file

Add a LICENSE file (MIT, Apache-2.0, etc.).

Tests exist

No test files found

Add tests that exercise each declared tool.

Production dependencies are patched

0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.12.1 (high), @modelcontextprotocol/sdk@1.12.1 (high)

Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 7 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Verified](https://m8ven.ai/badge/mcp/runotwo/mattermost-mcp?variant=verified)](https://m8ven.ai/mcp/runotwo/mattermost-mcp)
Shows verification status without the grade. Want the grade badge instead? Remove ?variant=verified from the URL.
commit: d51b8dd35b6d1c7fa54c28e38a0920714b4af9c2
code hash: a479ba914675472557e933b991a6134d819c9f9a78b73008fd904626be7d2259
view raw JSON →
Check MCPs from inside your assistant
Tool Check · MCP

Vetting this one by hand? Tool Check is an MCP that scores other MCPs. Add it once and ask Claude, ChatGPT, or any MCP client to grade a server, surface CVEs, check the publisher, and suggest safer alternatives — before you install.

https://m8ven.ai/api/mcp/tool-check
check_toolsearch_toolscompare_toolsrecommend_alternativescheck_publisherreport_concern
How to add it →Free · no account needed · works in any MCP client