slack-mcp vs Mattermost
slack-mcp is a plugin bundle for AI coding tools published by 2389-research. Marketplaces we read that list it: 1 (Community GitHub marketplaces). Mattermost is an MCP server published by vriesdemichael. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-25. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  slack-mcp |  Mattermost |
|---|---|---|
| Community marketplace 2389-research/claude-plugins | Listed Version: 1.1.0 Forks (GitHub): 0 Stars (GitHub): 1 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.4.0 Forks (GitHub): 0 Stars (GitHub): 0 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | slack-mcp | Mattermost |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 1 (better) | 0 (worse) |
| Forks (GitHub) | 0 | 0 |
| Last release (differs) | Not published | 2026-10-21 |
| Where it runs (differs) | Installs as a plugin bundle | On your machine (https://github.com/vriesdemichael/mm-mcp/releases/download/v0.4.0/mm-mcp_0.4.0_darwin_amd64.mcpb) |
| Transport (differs) | Not stated | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | 1, secrets among them: 1 | 10, secrets among them: 1 |
| Parts of the bundle (differs) | 1 | Not a bundle |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/2389-research/slack-mcp | github.com/vriesdemichael/mm-mcp |
| Changes in the last 7 days (differs) | 0 | 3 |
| First seen (differs) | 2026-10-14 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
slack-mcp
Slack workspace integration MCP server - create channels, invite users, post messages, manage threads for team collaboration
Mattermost
Read, search and post in Mattermost as yourself or a bot.
How to run each
slack-mcp As a Claude Code plugin
/plugin marketplace add 2389-research/claude-plugins
/plugin install slack-mcp@2389-researchMattermost
No data for an automatic command: what its marketplaces declare does not say unambiguously how to connect it.
Requires: MM_TOKEN (secret), MM_URL
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Only slack-mcp asks for
SLACK_BOT_TOKEN (secret)
Only Mattermost asks for
MM_MCP_ALLOW_WRITESMM_MCP_CA_FILEMM_MCP_DOWNLOAD_DIRMM_MCP_ELICITATION_OPT_INMM_MCP_FORCE_HUMAN_IN_THE_LOOP_IN_CLAUDE_CODEMM_MCP_MARK_AI_GENERATEDMM_MCP_POST_FROM_VIEWSMM_MCP_RESOURCE_MAX_MBMM_TOKEN (secret)MM_URL
Settings as each marketplace publishes them. Asking for fewer is not better in itself.
What it can do: slack-mcp · What it can do: Mattermost · Compare two other plugins
Data comes from public marketplace files in GitHub repositories of their authors. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.