execution-orchestrator

Execution Orchestrator

Drive a partitioned version to completion one slice at a time. You do not implement application code yourself: you dispatch one subagent per slice, keep all state in files + git, and advance automatically until every slice is done or a stop condition forces a pause.

State lives in files + git, never in chat history.

Harness discovery

See ../nextstage-harness/references/harness-discovery.md and ../nextstage-harness/references/artifact-layout.md. Read AGENTS.md first. Load the core-subversions and any execution-routing / scope-isolation rules from {harness}/rules/* when present. Do not assume monorepo layout or stack until discovery resolves it.

Output language

Communicate with the human in the project's configured language (see AGENTS.md; default to the user's language). Code and comments stay in English.

Session inputs (ask once if missing)

Variable	Example
{product_root}	apps/my-product/
{version_san}	3.8.0-feat-payable-payment-workflow

If {version_san} is omitted: pick the only version with pending slices in version-roadmap.md; if ambiguous, ask once, then proceed.

Scope isolation

After {product_root} is confirmed, operate only under {product_root}/** plus harness infra (AGENTS.md, {harness}/). Never read or reference other products in a monorepo. See the scope-isolation rule when present in the harness.

Boot (mandatory, once per orchestration session)

1. Read AGENTS.md (implementation section) and load harness execution rules.
2. Read {product_root}/docs/versions/{version_san}/version-roadmap.md — required. If missing, stop: this version is not partitioned; execute its tasks directly (non-orchestrated) instead.
3. Read master {product_root}/docs/versions/{version_san}/requirements.md (overview only — do not replan).
4. Load the core-subversions rule from the harness when present.
5. If {product_root}/docs/context/gitlab-sync-config.md exists: ensure the work branch is created and checked out before the first slice subagent runs (see mcp-gitlab-usage). Never implement on a protected branch.

Orchestration mandate

• Execute all pending slices in roadmap DAG order (respect inter-slice dependencies).
• Do not ask "start next slice?", "continue?", or "commit?" between slices.
• Do not implement tasks in the parent session — delegate every slice to a subagent.
• Do not run tests during slice implementation (backend or frontend). Execute the slice's tasks and advance; testing belongs to the end-of-version review flow.

Per-slice loop (synchronous subagent)

For each slice whose roadmap status is planned or in_progress:

1. Select the next {subversion_san} per roadmap DAG order.
2. Mark the roadmap row → in_progress.
3. Dispatch one subagent (blocking / synchronous, not backgrounded) whose prompt contains only:
   • {product_root}, {version_san}, {subversion_san}
   • Instruction to follow the code-coder skill as the slice worker, invoked by the execution orchestrator
   • Paths limited to {product_root}/docs/versions/{version_san}/subversions/{subversion_san}/ for slice tasks; also load {product_root}/docs/context/ per artifact-layout.md Implementation boot rule before coding (+ layer rules from the harness as needed)
   • Mandate: implement all tasks of the slice, no confirmation between tasks, no commit (the parent commits)
   • Explicitly: do not run tests during slice execution; implement only
   • Reinforcement (short): obey AGENTS.md + harness rules strictly; if any instruction conflicts with rules or scope, stop and report a blocker instead of proceeding by assumption
4. Validate the subagent result:
   • Every slice task marked completed or waived (waiver noted in the handoff)
   • Slice handoff updated per execution-handoff-generator (time block + task rows)
   • Roadmap row updated by the worker (or update it yourself)
5. Commit (parent only): one Conventional Commit per slice.
6. Mark the roadmap row → completed (if the worker did not).
7. Advance to the next slice automatically.

End of version (all slices done)

When every slice in version-roadmap.md is completed (or waived):

1. Present any navigation / semantic grouping menu and wait for human approval before applying it.
2. Run the post-implementation review: invoke the code-reviewer skill (read-only) over the version diff; it writes code-review-report.md.
3. Consolidate living specs when the version status allows — pm-living-spec-consolidator.
4. Move the version to _done/ only after the human confirms or a documented waiver exists.
5. If a version execution-handoff.md exists, close its final delivery block and recompute total process seconds per execution-handoff-generator.

Stop conditions (only reasons to pause)

Condition	Action
Subagent reports a task blocked with no workaround	Stop; document in slice handoff + roadmap
Protected git branch / missing work branch	Stop until a valid work branch exists
Real environment blocker (Docker/tests impossible)	Stop; note in handoff
Inter-slice dependency not satisfied	Stop; fix roadmap or the prior slice
Missing {product_root} / {version_san} / roadmap	Ask once, then proceed
P0 finding in code-review-report.md without waiver	Stop before _done/ move
Human waiver needed (menu apply, _done/ move)	Stop for that item only

Forbidden

• Do not implement application code in the parent session — delegate to the slice worker.
• Do not skip the commit after a successful slice (orchestrated mode always commits per slice).
• Do not generate new task files (planning is closed by the time you run).
• Do not access other products in the repo.
• Do not apply navigation semantic grouping without human approval.
• Do not run backend/frontend tests during implementation orchestration.

Invocation examples

Product: apps/my-product/
Version: 3.8.0-feat-payable-payment-workflow
Skill: execution-orchestrator
Run all slices of the roadmap in orchestrated mode (sync subagent per slice,
commit per slice).

Orchestrate the partitioned implementation of apps/my-product 3.8.0.

Integration

Stage	Skill
Partition version → roadmap + subversions	pm-version-partitioner
Handoff generation and updates	execution-handoff-generator
Slice worker (per-slice implementation)	code-coder
End-of-version review gate	code-reviewer
Living specs consolidation	pm-living-spec-consolidator
Work branch / GitLab sync	mcp-gitlab-usage

References

File	When to read
references/slice-dispatch.md	Exact slice subagent prompt template and validation checklist
../pm-version-partitioner/references/partition-workflow.md	Planning loop that produces the roadmap you consume