Standalone Slack MCP server for Claude Code Action
Connect Claude MCP Slack to Claude, Cursor or any other MCP client and it stops being a tab you switch to. Standalone Slack MCP server for Claude Code Action. The claude mcp slack mcp server is what makes that connection.
A standalone GitHub Action that provides Slack MCP (Model Context Protocol) server functionality for Claude Code Action, enabling secure Slack image downloads and integrations.
Setup follows the usual MCP pattern — install or clone the server, register it in your client's configuration file, restart the client. The configuration blocks on this page cover the common clients.
The toolset is worth reading before you wire it up, because it tells you what the integration is really for:
name — Setup Slack MCPInputs — The Inputs tool exposed by this serverOutputs — The Outputs tool exposed by this serverslack_image_download — The slack_image_download tool exposed by this serverslack_health_check — Checks the health and configuration of the Slack MCP serverTesting — The Testing tool exposed by this serverConfiguration is passed through the environment: API_KEY, SLACK_TOKEN, ANTHROPIC_API_KEY, CUSTOM_API_KEY. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.
Plenty of team communication servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Claude MCP Slack's toolset — name, Inputs, Outputs and 3 more — is a fair guide to whether it matches your workflow. It is maintained by atlasfutures; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| name | Setup Slack MCP |
| Inputs | The Inputs tool exposed by this server. |
| Outputs | The Outputs tool exposed by this server. |
| slack_image_download | The slack_image_download tool exposed by this server. |
| slack_health_check | Checks the health and configuration of the Slack MCP server. |
| Testing | The Testing tool exposed by this server. |
### Advanced Configuration
```yaml
- name: Setup Slack MCP
uses: atlasfutures/claude-mcp-slack@v1
with:
slack_token: ${{ secrets.SLACK_TOKEN }}
download_directory: "./slack-assets"
id: slack-mcp
- name: Claude Code Action with Multiple MCP Servers
uses: anthropics/claude-code-action@main
with:
mcp_config: |
{
"mcpServers": {
"slack": ${{ steps.slack-mcp.outputs.mcp_config }}.mcpServers.slack,
"custom": {
"command": "node",
"args": ["custom-server.js"],
"env": {
"API_KEY": "${{ secrets.CUSTOM_API_KEY }}"
}
}
}
}
anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}Configuration as documented by the project. Restart the client after saving.
| Variable | Description | Required |
|---|---|---|
| API_KEY | Credential the server authenticates with. | Yes |
| SLACK_TOKEN | Credential the server authenticates with. | Yes |
| ANTHROPIC_API_KEY | Credential the server authenticates with. | Yes |
| CUSTOM_API_KEY | Credential the server authenticates with. | Yes |
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