Base Harness

The Base harness is a blank-slate starting point with no bundled capabilities.

When to Use

• Full control over which tools and behaviors are available
• Testing individual capabilities in isolation
• Minimal-overhead sessions where no default tools are needed

Configuration

Property	Value
Type	base
Capabilities	None
System Prompt	”You are a helpful assistant.”
Default Model	None (inherits from agent or organization)

Usage

Assign the Base harness when creating an agent or session:

curl -X POST http://localhost:9300/api/v1/agents \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Minimal Agent",
    "harness_id": "<base-harness-id>",
    "capabilities": ["web_fetch"]
  }'

The agent’s own capabilities are added on top of the empty harness. In this example, only web_fetch would be available.

See Also

• Generic Harness — recommended default with core capabilities
• Harnesses feature guide — harness selection and API management