Skip to main content
Book a demo

Connect Slack to Hermes

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

Book a demo Hermes setup guide

Set up

Add Slack to Hermes in four steps

Admins approve the server once. Everyone in Hermes 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 Hermes to Runlayer

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

    Hermes 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 Hermes

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

Tools

37 Slack tools in Hermes

Runlayer policy decides which of these Hermes 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 Hermes

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

  • Gateway policy (available)

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

  • Audit trail (available)

    Each call is recorded with the user, Hermes 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 Hermes runs it.

  • Block output after it runs (available)

    Runlayer can block a tool’s output in Hermes and show a message in its place.

  • Redact output in place (not available)

    Hermes cannot take masked output, so Runlayer can block a tool’s output but not mask it. The gateway still applies policy to the call.

In Hermes

  • Hermes can replace blocked tool output with a message, but its after-call event is for monitoring only.

Frequently asked questions

Connect more

Find another combination