A TypeScript implementation of a simple MCP server that exposes datetime information to agentic systems and chat REPLs
Nothing to run from here
Mattermost is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
94/100
trust score
6
downloads a day
local
runs on your machine
87
downloads in 30d
What it does
Mattermost: read unreads, mentions, channels and threads; opt-in posting, edits, reactions
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --env 'MATTERMOST_URL=${MATTERMOST_URL}' --transport stdio toffguy77-mattermost-mcp '--' uvx mattermost-mcp-server
# 2 — ask your agent for something these tools do
# list_channels, get_channel_posts, get_thread and 17 more
It needs MATTERMOST_URL: this reads it from your environment, so export it first.
Mattermost costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publisher
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. This one runs on your machine: your client starts Mattermost as a process under your own user, with your files and your network, so the tool surface below is what it can do to your computer rather than to a server somewhere else. Its scan result is on the Security tab — read the surface before you approve it.
Claude Codedeclared by this listing
This is a public server: you run it yourself and this marketplace is not in the path. You need uv (docs.astral.sh/uv): uvx comes with it. Claude Code registers it in one command; --scope user makes it available in every project. Claude Code reads MATTERMOST_URL (Base URL of your Mattermost server, e.g. https://mattermost.example.com) from your environment each time it starts the server, so the value stays out of its config: export it in your shell profile (macOS, Linux), or run setx MATTERMOST_URL … and open a new terminal (Windows). The '--' is in quotes so that PowerShell passes it on.
claude mcp add --scope user --env 'MATTERMOST_URL=${MATTERMOST_URL}' --transport stdio toffguy77-mattermost-mcp '--' uvx mattermost-mcp-serverReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it runs from its publisher’s own package: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it asks of you
It reaches a system of yours, so it needs settings only you can give it: MATTERMOST_URL — Base URL of your Mattermost server, e.g. https://mattermost.example.com. You set it in your own client’s config, on your machine — this marketplace never holds it.
What it writes
One config entry your client uses to start the process locally. A local server runs with your file system and your network, which is why it is priced without metering.
What you approve
20 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
Read from its source code. A server that builds its tool list when it starts can list more tools than this.
List all Mattermost channels the authenticated user is a member of.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| team_id | string | no | Optional team ID to filter channels. If omitted, returns channels from all teams. |
| include_dm | boolean | no | Whether to include direct message channels. Default: True. |
| include_muted | boolean | no | If False, drop channels muted in the sidebar. Default: True. |
| category | string | no | Filter by sidebar category display name (case-insensitive), e.g. "Favorites". |
Get recent posts from a Mattermost channel, newest first.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| channel_id | string | yes | The channel ID (use list_channels or get_channel to find it). |
| since | string | no | ISO 8601 datetime — only return posts created after this timestamp. |
| limit | integer | no | Maximum number of posts to return. Default: 30. |
| before | string | no | A post ID — return posts older than it, to page back through history. |
Get a post and all its replies.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| post_id | string | yes | The root post ID. |
Full-text search across Mattermost posts, newest first.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| query | string | yes | Search terms. |
| channel_id | string | no | Optional channel ID to scope the search to a single channel. |
| category | string | no | Sidebar category display name to restrict results (case-insensitive), e.g. "Favorites". |
| include_muted | boolean | no | If True, also search muted channels. Default: False. |
| limit | integer | no | Maximum number of results. Default: 20. |
Get direct message history with a specific user, newest first.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| username | string | yes | The Mattermost username (without @). |
| limit | integer | no | Maximum number of messages to return. Default: 30. |
| since | string | no | ISO 8601 datetime — only return messages after this timestamp. |
| before | string | no | A post ID — return messages older than it, to page back through history. |
Get posts that mention the authenticated user, newest first.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| since | string | no | ISO 8601 datetime — only return mentions after this timestamp. |
| limit | integer | no | Maximum number of mentions to return. Default: 20. |
| include_muted | boolean | no | If False, drop mentions from muted channels. Default: True. |
Get unread message counts and mention badges per channel.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| include_muted | boolean | no | If True, include muted channels in the result. Default: False. |
| category | string | no | Filter by sidebar category (case-insensitive), e.g. "Favorites". |
Get a Mattermost user's profile by username.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| username | string | yes | The Mattermost username (without @). |
Get the authenticated user and what this server is allowed to do.
Takes no parameters.
List the teams the authenticated user belongs to.
Takes no parameters.
Get a single post by ID.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| post_id | string | yes | The post ID. |
Look up a channel by ID, or by its name (the URL slug, e.g. "town-square").
| Parameter | Type | Required | Notes |
|---|---|---|---|
| channel_id | string | no | — |
| name | string | no | — |
| team_id | string | no | — |
| team_name | string | no | — |
Find users by username, full name, nickname or email prefix.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| term | string | yes | Text to search for. |
| limit | integer | no | Maximum number of users. Default: 20. |
Get the posts pinned in a channel.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| channel_id | string | yes | The channel ID. |
Get metadata of a file attached to a post (see a post's file_ids).
| Parameter | Type | Required | Notes |
|---|---|---|---|
| file_id | string | yes | The file ID. |
Post a message to a channel, or reply in a thread.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| channel_id | string | yes | The channel ID to post in. |
| message | string | yes | Message text (Markdown supported). |
| root_id | string | no | Optional root post ID to reply in that thread. |
Send a direct message to a user, opening the DM channel if needed.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| username | string | yes | The recipient's username (without @). |
| message | string | yes | Message text (Markdown supported). |
Replace the text of one of your own posts. Other users' posts are refused.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| post_id | string | yes | The post ID. |
| message | string | yes | The new message text. |
Add your emoji reaction to a post.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| post_id | string | yes | The post ID. |
| emoji | string | yes | Emoji name, with or without colons, e.g. "thumbsup" or ":white_check_mark:". |
Remove your emoji reaction from a post. Not an error if it is not there.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| post_id | string | yes | The post ID. |
| emoji | string | yes | Emoji name, with or without colons. |
Free
$0 forever
- Every tool, no call limit
- No card, and mcprush charges nothing for it
- Source published under MIT
- Runs on your machine — nothing of it reaches our gateway
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install Mattermost or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: —
ATrust score 94 / 100
Release 1.1.0 · scanned 2 Nov 2026
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
Threat score100
Client score94
Findings2 threat · 0 capability
Capabilityhigh
Coveragesource
Verificationsource
Surface digeste874e2816c527166bc8aafd104d50f83d8d226fd8b7ad18b7906df7231622c43
Score vectorthreat 100 → client 94
| Term | Level | What it prices | Points |
|---|---|---|---|
| capability-exposure | high | capability blast radius (high) — client exposure if the model is manipulated | −6 |
| verification-discount | source | publisher verification (provenance) — cryptographic build provenance ties the artifact to its source | −0 |
| coverage-honesty | source | inspection depth (source) — how much of the target the scan could see | −0 |
score = clamp(round(threatScore − E_cap − E_ver − E_cov), 0, 100). No model, no opinion, no network call at scoring time: the same methodology version against the same bytes always produces this number, and every line above is a field of the report rather than a summary of it.
What the scan could actually read
A grade is only as meaningful as its coverage, so the scanner publishes its own depth before it publishes its result.
Tool surfaceread
Implementation sourceread
Package metadataread
Live transportnot available
Tools were statically extracted from the published source (20 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Capability — what it could do if the model were manipulated
Tags derived from each tool’s schema and the implementation, not from what the tool calls itself. high is the level these add up to.
| Tool | Capability tags | Why the tag was assigned |
|---|---|---|
| list_channels | no tags | |
| get_channel_posts | no tags | |
| get_thread | no tags | |
| search_posts | no tags | |
| get_direct_messages | no tags | |
| get_mentions | no tags | |
| get_unread | untrusted-input | untrusted-input: keyword "read_message" |
| get_user | no tags | |
| get_me | no tags | |
| list_teams | no tags | |
| get_post | no tags | |
| get_channel | no tags | |
| search_users | no tags | |
| get_pinned_posts | no tags | |
| get_file_info | no tags | |
| create_post | no tags | |
| send_direct_message | no tags | |
| update_post | no tags | |
| add_reaction | no tags | |
| remove_reaction | no tags |
Toxic-flow graph
The lethal trifecta, checked as a graph rather than as a checklist: untrusted input, a sensitive source and an external sink have to meet before there is a path worth worrying about.
The public result for this release does not print the flow graph, so there is nothing to show here. That is not the same as "no paths were found": what the scan did read is above, under coverage.
Supply chain and provenance
Integrityfirst-seen
Surface digeste874e2816c527166
Scanned2026-11-02
This is the first scan of this surface here, so there is nothing yet to compare it against.
Every result on this tab comes from one deterministic pass over the published package — offline, rule by rule, and auditable line by line above. Same methodology version, same bytes, same score.
Release history
Always latest — the install command names no version, so it installs the newest release when it runs; the current release on file is 1.1.0. Pin a release below and the command asks for exactly that one.
1.1.0
2 Nov 2026
latestNo release note was published with this version.
1.0.0
undated
- The version this listing was on when mcprush began following its releases. The registry was not asked when it shipped, so this row carries no date.
—
no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish Mattermost can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.