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While Vijil has a variety of pre-configured Harnesses that you can select from, you can also create your own Harnesses to obtain a Trust Score specific to your organization and agent.

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View Custom Harnesses

You can view previously created custom Harnesses by navigating to Harnesses in the left sidebar. To view the prompts, Personas and Policies in a custom Harness, click on its row in the Harnesses table.

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Create a Custom Harness

  1. In the left sidebar, navigate to Harnesses and press Create Harness.
  2. Enter a Harness name and a description.
  3. Select an Agent.
  4. Optional Select one or more Persona(s).
  5. Select one or more Policies.

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Create a Custom Harness via MCP

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Create a Harness

With the Vijil MCP server configured, ask Claude Code in natural language:

Create a custom Harness called 'Customer Support Harness' for agent a1b2c3d4-… with the GDPR policy

Claude creates the Harness and returns the ID.
Custom Harnesses are immutable once created. To change the configuration, delete the Harness and create a new one.

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Check Generation Status

Harness generation is asynchronous. Ask Claude to check until status is active.

What is the status of custom Harness h1a2b3c4-…?

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Get Harness Prompts

Retrieve the generated Probes for a completed Harness.

Show me the prompts for custom Harness h1a2b3c4-…

Returns an empty list if the Harness is still in draft status.

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List Custom Harnesses

List my custom Harnesses

List my custom Harnesses for agent a1b2c3d4-… with status active

Both support filtering by agent and status.

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Cancel Generation

Stop a Harness that is still generating.

Cancel the custom Harness h1a2b3c4-… that is still generating

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Delete a Harness

Delete custom Harness h1a2b3c4-…

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Next Steps

Run Evaluations

Execute custom Harness evaluations

Understand Results

Analyze custom Harness results

Personas

Learn more about Personas

Policies

Learn more about Policies
Last modified on July 1, 2026