io.github.mindstone/mcp-server-slack
Slack
Is the Slack MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-14.
Slack MCP server: channels, messages, threads, reactions, users, files, and scheduled messages
alive probed 2026-11-14
- Run it
- npx -y @mindstone/mcp-server-slack@0.3.7 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- slack-mcp-server 0.3.7
- Capabilities
- experimental, resources, tools
- Instructions
- none
- Of a 1M window
- 1.3 % of a 1M context window
- Count
- 13k tokens in Claude Opus 5.5, exact, measured 2026-11-07. With the Claude Code prefix mcp__…__ on each tool name: 13k. The o200k_base estimate is 7.4k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/mindstone/mcp-servers
- Registry
- active, updated 2026-11-14 · registry entry
- Changes
- 5 recorded, reachable in 5 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.74×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| search_slack_messages | 799 | 460 | 6 % |
| post_slack_message | 604 | 348 | 5 % |
| upload_slack_file | 573 | 330 | 4 % |
| get_slack_channel_history | 523 | 301 | 4 % |
| open_slack_dm | 479 | 276 | 4 % |
Compare this server with others.
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- Retell AI io.github.mindstone/mcp-server-retell-ai · alive
- Runway ML io.github.mindstone/mcp-server-runway · alive
- Salesforce io.github.mindstone/mcp-server-salesforce · alive
- ServiceNow io.github.mindstone/mcp-server-servicenow · alive
- TalentLMS io.github.mindstone/mcp-server-talentlms · alive
- Vanta io.github.mindstone/mcp-server-vanta · alive
- Wise io.github.mindstone/mcp-server-wise · alive
- Workday io.github.mindstone/mcp-server-workday · alive
Servers that mention slack.
- ai.backengine/backengine-mcp · needs auth
- LinkDeal ai.linkdeal.www/mcp · needs auth
- Stumpy ai.stumpy/agents · needs auth
- ai.waystation/mcp · paid (402)
- ai.waystation/slack · paid (402)
- ai.smithery/smithery-ai-slack · not found
- Attrove com.attrove/mcp · needs auth
- Genchi com.genchi/genchi · needs auth
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-11-07 07:52 | alive | 491 ms | 39 | 13k | 7.4k |
| 2026-11-02 08:21 | alive | 333 ms | 39 | 13k | 7.2k |
| 2026-11-01 08:16 | alive | 520 ms | 39 | 13k | 7.2k |
| 2026-10-29 07:46 | alive | 383 ms | 39 | 13k | 7.2k |
| 2026-10-17 06:17 | alive | 587 ms | 39 | 12k | 6.9k |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.