# Orchestrator (Phase 2) — in-app multi-agent conductor

## Source

Settled via a conversational `grill-me` design session. The captured behavioral
spec (12 decisions, the *what*) is
[artifacts/design-context.md](artifacts/design-context.md); the HOW is
[design.md](design.md), decomposed in [tasks.md](tasks.md) and committed in
[artifacts/implementation-decision-log.md](artifacts/implementation-decision-log.md)
(D-1…D-10). Note: design-context **decision 5** ("no worktree") is REVISED by
D-3/D-4 (worktree kept as a harmless read snapshot; read-only enforced by qwen
plan mode).

## Why

Phase 1 shipped a deterministic multi-agent **conductor** as a standalone host CLI
(`/opt/boocode/conductor/`): Han flows that fan out read-only specialist agents,
apply the evidence/yagni contracts, and emit an evidence-disciplined report. It is
not reachable from the app — a user in BooChat or BooCoder cannot launch a flow,
cannot watch agents progress live, and the run leaves no persisted, reopenable
artifact.

This change brings the conductor in-app: launch any Han flow from the shared
composer, watch each agent stream live (Paseo-style parent-with-subagents), and
get the report — all on the **already-loaded local Qwen 35B, free**, with the run
persisted and resumable across a coder restart. It reuses the existing task
dispatcher, streaming pipeline, and broker rather than standing up a parallel
execution path (see [design-context](artifacts/design-context.md) decision 4 and
D-2/D-3).

## What Changes

- **Two doors, full parity.** A `Workflow` button and a slash command on the shared
  `ChatInput` composer → both appear in BooChat (ChatPane) and BooCoder (CoderPane),
  desktop and mobile (icon-only). Slash launches instantly with defaults; the
  button opens a flow launcher first. (decisions 2, 8, 9 · D-8)
- **A new `orchestrator` pane kind.** A run view alongside `chat | coder |
  terminal`: flow + band header, the report at the top on completion, a collapsed
  agent roster, expand-one-at-a-time to watch a single agent's live stream.
  (decision 3 · D-7)
- **Read-only flows, enforced HARD.** Every step runs as a qwen agent under
  `--approval-mode plan` (`mode_id='plan'`): reads allowed, writes blocked at the
  tool level. Flows never write the repo; the report is the only output.
  (decision 5 revised · D-4)
- **Execution reuses the dispatcher.** Each flow step is inserted as a normal
  `tasks` row; the existing dispatcher runs it through the external-agent path and
  streams AgentEvents → WS frames unchanged. One new `onTaskTerminal` hook advances
  the flow. (decisions 1, 4 · D-2, D-3)
- **Persisted + resumable runs.** New `flow_runs` / `flow_steps` tables in the
  coder schema; a run survives a coder restart (`initResume` reconciles mid-flight
  steps). Runs are reopenable from a history; the report is exportable on demand
  (copy / save-file / send-to-chat). (decisions 4, 10 · D-5, D-9)
- **Qwen-only, one model per run.** Default `qwen3.6-35b-a3b-mxfp4`, held as a
  single config value so more local models slot in later. Multiple runs allowed,
  each its own pane. (decisions 6, 11 · D-10)
- **Conductor definitions re-homed.** The pure flow/spine/contracts/types/render
  files + 23 personas are copied into `apps/coder/src/conductor/`; the Phase-1 CLI
  stays alive. The evidence/yagni contracts and adversarial-validator gate are
  preserved (the flow-runner builds each prompt in-process before dispatch).
  (decision 1 · D-1)

## Impact

- **`apps/coder` (deploy: `sudo systemctl restart boocoder`):** new
  `conductor/` defs, `flow-runner.ts`, the `onTaskTerminal` dispatcher hook,
  `flow_runs`/`flow_steps` in `schema.sql`, `initResume`, `POST /api/runs` +
  list/reopen routes.
- **`packages/contracts` + `apps/web` (deploy: `docker compose up --build -d
  boocode`):** two new WS frames (in all three registries), the `orchestrator`
  pane kind + `OrchestratorPane.tsx`, the `Workflow` toolbar button + slash wiring,
  `FlowLauncherDialog.tsx`, runs history + export.
- **No `apps/server` chat-pipeline change** beyond the contracts frame registry
  (the web type is the wire gate).
- **Safety:** read-only is the whole feature's invariant; D-4 makes it a tool-level
  gate, not a prompt. Reviewed by adversarial-security-analyst in R2.

## Out of scope (carried from design-context)

- A Claude execution path (Claude Code covers it).
- Folding Arena into the Orchestrator (stays separate).
- Per-agent model tiering (single model per run for now).
- Pixel-faithful per-skill Han report templates (spine-level only).
