Slack MCP
Send messages, upload files, search history, and manage Slack channels and DMs for your workspace.
Overview
| Catalog ID | mcp-slack |
| Category | communication |
| Auth method | OAuth |
| Blast radius | moderate |
| Trust | Verified — published by cendriix |
| Version | 1.3.0 |
| Regions | us-east-1, eu-west-1, ap-southeast-1 |
Tools
| Tool | Description |
|---|---|
send_message | Send a message to a Slack channel or DM. |
list_channels | List Slack channels in the workspace. |
upload_file | Upload a file to a Slack channel. |
search_messages | Search Slack messages across all channels. |
create_channel | Create a Slack channel. |
Tool parameters
send_message
Send a message to a Slack channel or DM.
| Parameter | Type | Description | |
|---|---|---|---|
channel | string | required | Channel ID or name (e.g. #general or C01234ABC) |
text | string | required | Message text (supports Slack markdown) |
upload_file
Upload a file to a Slack channel.
| Parameter | Type | Description | |
|---|---|---|---|
channel | string | required | Channel ID to upload to |
content | string | required | File content as text |
filename | string | required | Filename for the upload |
search_messages
Search Slack messages across all channels.
| Parameter | Type | Description | |
|---|---|---|---|
query | string | required | Search query string |
create_channel
Create a Slack channel.
| Parameter | Type | Description | |
|---|---|---|---|
name | string | required | Channel name |
is_private | boolean | optional | Create as private channel |
Installing
- In Cendriix, go to Settings → MCPs
- Find Slack and click Install
- Click Authorize after installing. Cendriix completes the OAuth flow with the provider and refreshes tokens automatically — you never paste a long-lived secret.
- Click Test Connection to run a health check and list available tools
Authentication. Click Authorize after installing. Cendriix completes the OAuth flow with the provider and refreshes tokens automatically — you never paste a long-lived secret.
Blast radius
This MCP is classified moderate. This MCP can create and update records in the connected service, but cannot delete infrastructure.
Every tool invocation is recorded in your Audit Log. You can remove this MCP at any time from Settings → MCPs, which revokes tool access immediately.
Further reading
- MCP Marketplace — browse and install MCPs
- Policies & Guardrails — approval gates and blast radius
- Audit Log — review tool invocations
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