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Connect Chrome DevTools to Hermes

Give Hermes governed access to Chrome DevTools’s 26 tools through Runlayer, with identity, policy, scanning, and audit on every call.

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Set up

Add Chrome DevTools to Hermes in four steps

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

  1. 1

    Approve Chrome DevTools in Runlayer

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

  2. 2

    Connect Hermes to Runlayer

    Install the Runlayer CLI so Hermes can reach Chrome DevTools, which runs on the user’s machine.

    Hermes setup guide
  3. 3

    Sign in to Chrome DevTools

    Sign in the way Chrome DevTools requires. Runlayer holds the credentials so they stay out of the client’s configuration.

  4. 4

    Use Chrome DevTools from Hermes

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

Tools

26 Chrome DevTools tools in Hermes

Runlayer policy decides which of these Hermes users can call. 10 read data only.

  • Click

    Clicks on the provided element

  • Close page

    Closes the page by its index.

  • Drag

    Drag an element onto another element

  • Emulate

    Emulates various features on the selected page.

  • Evaluate script

    Evaluate a JavaScript function inside the currently selected page.

  • Fill

    Type text into a input, text area or select an option from a element.

  • Fill form

    Fill out multiple form elements at once

  • Get console message

    Gets a console message by its ID.

See all 26 Chrome DevTools 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 Chrome DevTools 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

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