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Connect Slack to Cline CLI

Give Cline CLI governed access to Slack’s 37 tools through Runlayer, with identity, policy, scanning, and audit on every call.

Book a demo Cline CLI setup guide

Set up

Add Slack to Cline CLI in four steps

Admins approve the server once. Everyone in Cline CLI then gets it through the same governed connection.

  1. 1

    Approve Slack in Runlayer

    Add Slack from the catalog and choose who can use it and which of its tools are allowed.

  2. 2

    Connect Cline CLI to Runlayer

    Users add the Runlayer Plugin to Cline CLI by following Runlayer’s setup guide. Cline CLI reaches Slack’s 37 tools through the Runlayer Plugin’s search and execute tools instead of listing each one.

    Cline CLI setup guide
  3. 3

    Sign in to Slack

    Each user signs in to Slack with OAuth. Runlayer keeps the tokens out of the client’s configuration.

  4. 4

    Use Slack from Cline CLI

    Slack’s approved tools appear in Cline CLI. Every call is checked against policy and recorded.

Tools

37 Slack tools in Cline CLI

Runlayer policy decides which of these Cline CLI users can call. 5 read data only.

  • Add list record

    Adds a new record (row) to a Slack list.

  • Add reaction

    Adds a reaction (emoji) to a Slack message.

  • Complete file upload

    Finalizes a file upload started with slack_get_file_upload_url, using the file_id from that call.

  • Create canvas

    Creates a Slack Canvas document from Canvas-flavored Markdown content.

  • Create conversation

    Create a channel, DM, or group DM.

  • Create list

    Creates a new Slack List with optional columns and a description.

  • Get file upload URL

    Generates a signed upload URL for a file, plus a file ID.

  • Get reactions

    Retrieves all reactions (emoji) on a specific Slack message.

See all 37 Slack tools

Control

What Runlayer can see and stop in Cline CLI

Some controls apply to every client at the gateway. Others depend on what Cline CLI exposes to Runlayer.

  • Gateway policy (available)

    Every Slack call from Cline CLI passes through Runlayer, where your policies can allow, alert, mask, or block it.

  • Audit trail (available)

    Each call is recorded with the user, Cline CLI as the client, the tool, and the policy and scanner decisions.

  • Client hooks (available)

    Capture supported prompts, reasoning, local and MCP tool calls, responses, and scanner decisions in real time.

  • Stop a call before it runs (available)

    Runlayer can deny a tool call before Cline CLI runs it.

  • Block output after it runs (not available)

    Cline CLI ignores Runlayer after a tool runs, so Runlayer cannot block its output. The gateway still applies policy to the call.

  • Redact output in place (not available)

    Runlayer cannot mask tool output in Cline CLI. The gateway still applies policy to the call.

In Cline CLI

  • If Runlayer’s hook times out or crashes, Cline CLI lets the tool call through.
  • This covers the Cline CLI, not the Cline extension for VS Code.

Frequently asked questions

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