---
mode: CREATE
adr_id: ADR-0.18.0
branch: main
timestamp: "2026-03-20T14:35:00Z"
agent: claude-code
obpi_id: OBPI-0.18.0-02
session_id:
continues_from: .gzkit/handoffs/20260320T120300Z-obpi-01-completed-next-obpis.md
---

<!-- Handoff document for ADR-0.18.0 — created by claude-code at 2026-03-20T14:35:00Z -->

## Current State Summary

OBPI-0.18.0-02 (Controller/Worker Stage 2 — Implementer Subagent Dispatch) pipeline completed successfully. All five stages ran to completion: context loaded from prior handoff, implementation completed (dispatch data models, task extraction, complexity classification, model routing, prompt composition, result parsing, dispatch state management in `pipeline_runtime.py`), verification passed (773 tests, 46 OBPI-specific, 15 BDD scenarios, lint/typecheck/docs clean), human attested "completed", and sync pushed to remote.

## Important Context

- OBPI-01 (role taxonomy) and OBPI-02 (implementer dispatch) are both Completed.
- OBPIs 03, 04 can proceed in parallel after OBPI-02. OBPI-05 depends on 02, 03, and 04.
- ADR-0.18.0 parent lane is Heavy. OBPI-02 was Heavy lane (external contract change in SKILL.md).
- The `obpi-completion-validator.py` hook requires `### Implementation Summary` and `### Key Proof` sections (h3 headings) with substantive content before allowing status change to Completed.
- `pipeline_runtime.py` is now 710 lines — above the 600-line module limit. Consider splitting dispatch code into a separate module in OBPI-05 (runtime integration).

## Decisions Made

- **Decision:** Added dispatch orchestration directly to `pipeline_runtime.py` as specified in the brief's allowed paths.
  **Rationale:** Brief explicitly lists `src/gzkit/pipeline_runtime.py` as the target for dispatch loop, result handling, and task state tracking.
  **Alternatives rejected:** Separate `dispatch.py` module (would violate brief allowlist).

## Immediate Next Steps

1. Plan and execute OBPI-0.18.0-03 (Two-stage review protocol: spec compliance + code quality reviewer subagents)
2. Plan and execute OBPI-0.18.0-04 (REQ-level parallel verification dispatch in Stage 3)
3. After 03 and 04 complete: OBPI-0.18.0-05 (Pipeline runtime and skill integration)

## Pending Work / Open Loops

- OBPIs 03-05 remain Pending (0/3 remaining completed)
- `ADR-pool.task-level-governance` promotion decision still deferred
- `pipeline_runtime.py` module size (710 lines) should be addressed in OBPI-05

## Verification Checklist

- [x] `uv run gz test` passes (773 tests)
- [x] `uv run gz lint` clean
- [x] `uv run gz typecheck` clean
- [x] `uv run -m unittest tests.test_pipeline_dispatch -v` passes (46/46)
- [x] `uv run -m behave features/subagent_pipeline.feature` passes (15/15 scenarios)
- [x] `uv run gz obpi reconcile OBPI-0.18.0-02-implementer-subagent-dispatch` passes
- [x] Branch matches: main
- [x] Changes pushed via `gz git-sync`
- [x] No pipeline markers active
- [x] No OBPI locks active

## Evidence / Artifacts

- `src/gzkit/pipeline_runtime.py` — dispatch data models (TaskComplexity, DispatchTask, DispatchRecord, DispatchState), task extraction, complexity classification, model routing, prompt composition, result parsing, dispatch state management
- `tests/test_pipeline_dispatch.py` — 46 unit tests across 8 test classes
- `features/subagent_pipeline.feature` — 15 BDD dispatch lifecycle scenarios
- `features/steps/subagent_pipeline_steps.py` — BDD step implementations
- `.claude/skills/gz-obpi-pipeline/SKILL.md` — Stage 2 updated with controller/worker architecture
- `docs/design/adr/pre-release/ADR-0.18.0-subagent-driven-pipeline-execution/logs/obpi-audit.jsonl` — attestation and audit ledger entries
