Delegation Without Team Sprawl: Private Internal Specialists
A task-capable agent should be able to ask for help, but every helper does not need to become a permanent member of the user's workspace. This afternoon we added two delegation paths to the Harness: durable background work on known agents and private internal specialists owned by the current host session.
Delegate to Real Agents When Identity Matters
Use normal FabrCore agents when the worker has a durable business identity: a compliance reviewer, a billing specialist, or an operations agent with its own state and ACL grants. Harness delegation uses FabrCore messaging, so the request carries routing, principal boundaries, tracing, and the health behavior operators already know.
Background delegation lets the host advance independent items concurrently and merge the results when they are needed. The plan remains the coordination surface; a worker response becomes evidence attached to a specific item rather than an unstructured side conversation.
Use Internal Specialists for Ephemeral Expertise
Sometimes the host only needs a fresh perspective for one bounded subtask: critique a draft, compare two approaches, classify a document, or verify a calculation. Publishing a durable agent handle for each of those roles creates operational noise and expands the security surface.
An internal specialist is private to the Harness session. It receives focused instructions and selected context, returns a result to the host, and does not appear as a reusable public team member. The host owns its lifecycle and remains accountable for the final answer.
The Design Rule
If a helper needs durable identity, independent state, direct messages, or its own permissions, make it a FabrCore agent and place it in a squad. If the helper is a temporary reasoning role that exists only to advance one plan item, make it an internal specialist.
That rule keeps Surface honest. The command center shows the durable team operators can address and manage. Ephemeral reasoning stays inside the task that created it, while traces and Harness snapshots still explain how its result influenced the work.
Surface squads compose durable teams; the Agent Harness executes and delegates the work.