Agent descriptor
An agent descriptor is the versioned file — typically YAML plus a system prompt — that fully defines an agent: model, tools, skills, input/output schemas, policies and constraints. Nothing outside the descriptor can affect runtime behavior, which makes the agent reviewable, diffable and auditable like any other code artifact.
In NeoXam Agents
'No agent without a descriptor': descriptors live in the Git-governed Catalog and are the single source of truth for each agent. The model is a descriptor field — switching it is configuration, not re-architecture — and every descriptor change re-triggers the agent's evals against its baseline.
Related terms
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