The Session struct is defined in session.go — named after what it is.
No more 'harness' concept; that was an artifact of the interface+impl
pattern we removed.
Session is now an exported struct with unexported fields.
Methods ARE the API — no interface declaration in the package.
Consumers that need mockability define their own interface
(implicit satisfaction, standard Go pattern).
The agent/ package is now session/ — because a session is the
top-level concept. The package contains:
- harness: implements Core, the session orchestrator
- Agent: the reasoning entity (history, runtime, tools)
- History: conversation accumulator
- Fifo, loop, compaction, hooks, commands
The old session/ package (which just held extracted fields) is
dissolved back into the harness. One package, clean ownership.
Extend the core session with fields that are genuinely session
concerns currently duplicated in 9p/session:
- Plan (markdown checklist, survives compaction)
- PrevPrompt (last submitted prompt text)
- Peers (bidirectional session links)
The 9p/session layer can delegate to these in a future change.
Defines Session (ID, CWD, state, env, bus, FIFO) as the runtime
environment that hosts an agent. This is the foundation for separating
session concerns from agent reasoning concerns.
Levi Neely