The worker previously constructed `new Agent({systemPrompt, model, tools,
messages, streamFn})` and stopped there — transformContext,
beforeToolCall, afterToolCall, sessionId, thinkingLevel, and steer/
followUp were all dark. Approval enforcement, artifact projection,
auto-compaction, and mid-run steering all had to reach the agent
through other, non-canonical channels (event observers, prompt-block
injection at prepareRun, API-layer gates). That left the whole pi
contract at one-tenth utilisation and forced business logic into the
wrong seams.
This change rebuilds the contract assembly layer:
- `pi-agent-factory` builds the Agent with the full option surface:
sessionId (taskSessionId), thinkingLevel (mapped from
agent.metadataJson), and three RPC-proxied hooks.
- Each hook shuttles a thin payload over the existing worker RPC
channel into `RuntimeBridge`, which routes to `hook-handlers`:
* beforeToolCall → approval-gate policy (blocks destructive
tools while a pending approval is outstanding).
* afterToolCall → filesystem artifact projection, previously
nested in the tool_execution_end event observer.
* transformContext → pass-through today; compaction wires in
next commit.
- ParentMessage gains `steer-run` / `followup-run`; `WorkerRunner`
keeps a runId→Agent registry so main can inject mid-run messages
into the active pi loop.
`worker-types` extends the rpc-request method enum; `runtime-bridge`
loses the per-event artifact projector and gains a `findActiveRunForAgent`
lookup used by the upcoming inbox → steer path. No public main API
changes yet — the wiring is the foundation for the next five commits.
ZacharyZhang-NY
e1693899a2