| title | Phase 03: Brain Orchestration |
|---|---|
| version | v0.2-refresh |
| date | 2026-05-01 |
| status | refreshed |
| public_scope | curated |
Phase 03 builds the Brain: the orchestration layer that turns a user goal into structured plans, executable steps, observations, recovery decisions, and HITL requests.
The private system hardened Brain behavior around typed state, planner/executor boundaries, trace ids, step ids, HITL resume behavior, and safer reasoning contracts. The public refresh documents that direction without publishing the full private orchestration stack.
- LangGraph-style state-machine architecture.
- Planner, Executor, Observer, and HITL node responsibilities.
- Explicit separation between planning and tool execution.
- State and execution-history concepts used by later replay work.
- Planner produces structured steps.
- Executor routes capability calls through Hand.
- Observer records evidence and state changes.
- HITL gates sensitive or ambiguous operations.
- Brain does not directly own browser or desktop internals.
- Plans have step ids that can be referenced by events and traces.
- Failures can route to retry, re-plan, HITL, or stop.