rlm-workflow

name	rlm-workflow
description	Orchestrates the RLM repo workflow end-to-end with phase gates, locked artifacts, addenda, traceability, and automatic bootstrap/upsert of AGENTS/PLANS scaffolding. Trigger phrases: "Implement requirement <run-id>", "Run RLM Phase <N>", "resume requirement", "lock Phase <N>", "verify locks".

RLM Workflow

Overview

Implement repository work using the canonical RLM process in .agent/PLANS.md, with invocation conventions from .codex/AGENTS.md. Treat repository artifacts as the source of truth and keep prompts as path-based commands.

Trigger examples

• Implement requirement '2026-02-24-add-oauth'
• Run RLM Phase 2 for .codex/rlm/2026-02-24-add-oauth/
• Resume requirement '2026-02-24-add-oauth' after manual QA
• Verify locks for .codex/rlm/2026-02-24-add-oauth/
• Lock Phase 3 for run '2026-02-24-add-oauth'

Bootstrap preflight (always run first)

Before doing anything else, ensure the repo scaffolding exists and is up to date:

• .codex/AGENTS.md contains the RLM Workflow block (managed upsert block)
• .agent/PLANS.md contains the canonical workflow block from references/plans-canonical.md (managed upsert block)
• .codex/rlm/ exists
• Any other files created by the installer scripts (scripts/install-rlm-workflow.ps1 or scripts/install-rlm-workflow.py) exist

If any are missing/outdated, run:

# Windows PowerShell:
powershell -ExecutionPolicy Bypass -File ./scripts/install-rlm-workflow.ps1 -RepoRoot .

# PowerShell 7+ (pwsh):
pwsh -NoProfile -File ./scripts/install-rlm-workflow.ps1 -RepoRoot .

# Python (Windows/macOS/Linux):
python ./scripts/install-rlm-workflow.py --repo-root .
# or:
python3 ./scripts/install-rlm-workflow.py --repo-root .

# Bash wrapper (macOS/Linux):
bash ./scripts/install-rlm-workflow.sh --repo-root .

If script execution isn't possible, perform an equivalent manual bootstrap:

• Create missing directories/files listed above
• Upsert canonical plans from references/plans-canonical.md into .agent/PLANS.md using managed markers
• Upsert the "RLM Workflow Skill" block into .codex/AGENTS.md using managed markers

Then continue with the workflow phases.

Read Order

1. Read .codex/AGENTS.md intro sections for local invocation conventions.
2. Read .agent/PLANS.md for canonical phase rules and requirements.
3. If AGENTS wording and PLANS wording differ, follow PLANS (AGENTS declares PLANS canonical) and note the mismatch in the current phase artifact when relevant.

Trigger Examples

• Implement requirement '<run-id>'
• Run RLM Phase 2 for .codex/rlm/<run-id>/
• Create .codex/rlm/<run-id>/02-to-be-plan.md with Coverage and Approval gates
• Update tests and lock Phase 4 artifact for this run

Invocation Mode

• Single-command mode:
  • On Implement requirement '<run-id>', resolve run folder and execute phases sequentially.
  • Pause only for manual QA sign-off in Phase 5.
• Single-phase mode:
  • On Run RLM Phase N, execute only that phase and write only that phase outputs, but only when all required earlier phases are lock-valid.

Single-Command Contract (Mandatory)

• Resolve run folder at .codex/rlm/<run-id>/.
• If run folder or 00-requirements.md is missing, stop and ask for it. Do not invent requirements.
• Auto-resume from current state:
  • Phase 0 (Requirements): Confirm 00-requirements.md exists (user-created starting point). Stop if missing.
  • Phase 0 (Worktree): Create/enter an isolated worktree, then execute the run from that worktree.
  • If a phase artifact exists as DRAFT or with failing gates, resume that phase.
  • If a phase artifact is missing, create it for the next phase in sequence.
  • Never back-edit locked prior-phase artifacts.
• Execute in order: Phase 0 through Phase 7.
• For Phase 0 (Worktree Isolation - REQUIRED):
  • Treat 00-requirements.md as the starting input for the run (it must already exist).
  • Check if worktree exists at .worktrees/<run-id> or configured location.
  • If on main/master branch: require explicit consent or auto-create worktree.
  • Verify worktree directory is git-ignored (if project-local).
  • Run project setup (npm install, cargo build, etc.).
  • Verify clean test baseline.
  • Create/lock 00-worktree.md before proceeding.
  • Skill: skills/rlm-worktree/SKILL.md
• For Phase 1.5 (Debug Mode - optional):
  • Determine if requirement needs debugging (bug fixes, test failures, unexpected behavior).
  • If yes: create/lock 01.5-root-cause.md before Phase 2.
  • Phase 1.5 uses systematic debugging (see skills/rlm-debugging/SKILL.md).
• For Phase 5:
  • Write 05-manual-qa.md with scenarios in DRAFT.
  • Pause and request user results/sign-off.
  • On next invocation, record results, lock Phase 5, then continue to Phase 6 and 7.

Phase Transition Guardrail (Mandatory, Hard Stop)

• Before starting Phase N, validate the lock chain for all prior phases (0..N-1) using .agent/PLANS.md.
• If Phase 0 exists: It must be lock-valid before Phase 1/2 can begin (worktree isolation verified).
• If Phase 1.5 exists: It must be lock-valid before Phase 2 can begin.
• A prior phase is considered lock-valid only when its base artifact and phase-local addenda are LOCKED, include LockedAt and LockHash, and end with Coverage: PASS and Approval: PASS.
• Lock Verification: Verify LockHash matches SHA-256 of normalized artifact content (LF newlines; LockHash: line removed). Use scripts/verify-locks.py (cross-platform) or scripts/verify-locks.ps1 (PowerShell) for automated validation.
• If any prior phase is not lock-valid, do not create or update later-phase artifacts.
• Resume the earliest failing phase and repair it until lock-valid, then continue.
• Never start Phase 6 or 7 unless 05-manual-qa.md is lock-valid.
• The only intentional pause is Manual QA in Phase 5; all other pauses are blockers.

Main Branch Protection (Mandatory)

The Iron Law: NEVER WORK ON MAIN/MASTER BRANCH WITHOUT EXPLICIT CONSENT.

Automatic Protection

When invoked from main/master branch:

1. STOP and display warning
2. Default action: Create isolated worktree
3. Require explicit consent to proceed on main

Consent Requirements

If user insists on main branch work:

• Document acknowledgment of risks
• Record explicit consent with timestamp
• Note reason for exception
• Recommendation: Use worktrees for future requirements

Worktree Creation (Default)

# Create feature branch worktree
git worktree add .worktrees/<run-id> -b rlm/<run-id>
cd .worktrees/<run-id>

All subsequent phases execute in worktree context.

TDD Discipline (Phase 3 Mandatory)

The Iron Law: NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST.

RED-GREEN-REFACTOR in Phase 3

1. RED Phase:

   • Write minimal test showing expected behavior
   • Run test, verify it fails correctly
   • Document failure in Phase 3 artifact TDD Compliance Log

2. GREEN Phase:

   • Write simplest code to pass test
   • Run test, verify it passes
   • Document minimal implementation

3. REFACTOR Phase:

   • Clean up while staying green
   • Document cleanups

TDD Compliance Log

Every Phase 3 artifact must include:

## TDD Compliance Log

### R1: [description]
**Test:** `path/to/test.ts` - "[name]"
**RED:** [timestamp] - Failed as expected: [output]
**GREEN:** [timestamp] - Minimal implementation: [description]
**REFACTOR:** [timestamp] - Cleanups: [description]

Red Flags - DELETE and Restart

• Code written before test -> DELETE IT
• Test passes immediately -> Fix the test
• "I'll add tests later" -> No you won't

Reference: skills/rlm-tdd/SKILL.md

TODO Discipline (All Phases Mandatory)

The Iron Law: NO LOCKING OR PHASE ADVANCEMENT WITH UNCHECKED TODOS.

TODO Requirements

Every phase artifact MUST include a ## TODO section with:

1. Checkable items for every task, sub-phase, and deliverable
2. Progressive checkoffs as work completes
3. Zero unchecked items before locking

TODO Structure

## TODO

- [ ] Task 1: [description]
- [ ] Task 2: [description]
  - [ ] Sub-task 2a: [description]
  - [ ] Sub-task 2b: [description]
- [ ] Task 3: [description]

TODO Rules

#### TODO Hard Gate

Do NOT lock a phase or proceed to next phase until:

• ALL TODO items are checked off ([x])
• NO unchecked items remain ([ ] or empty boxes)
• No "work in progress" or "deferred" items

Exception: None. Complete all todos before locking.

Per-Phase TODO Patterns

Phase 0 Worktree:

• Worktree created
• Branch protection verified
• Clean baseline confirmed
• Phase 0 worktree artifact written

Phase 0 Requirements:

• Requirements elicited
• Acceptance criteria defined
• Out of scope documented
• Phase 0 artifact written

Phase 1 AS-IS:

• Current behavior documented
• Code pointers recorded
• Known unknowns listed
• Phase 1 artifact written

Phase 1.5 (if used):

• Error analysis complete
• Reproduction confirmed
• Root cause identified
• Phase 1.5 artifact written

Phase 2:

• Sub-phases defined (if needed)
• File changes specified
• Test commands documented
• Phase 2 artifact written

Phase 3:

• SP1 implemented and tested
• SP2 implemented and tested
• ... (per sub-phase)
• TDD Compliance Log complete
• Phase 3 artifact written

Phase 3.5 (if used):

• Plan alignment verified
• Code quality assessed
• Issues categorized
• Verdict recorded
• Phase 3.5 artifact written

Phase 4:

• Pre-test implementation audit completed (Phase 3 summary vs requirements and Phase 2 plan)
• Unit tests executed
• Integration tests executed
• E2E tests executed (Tier A)
• Phase 4 artifact written

Phase 5:

• QA scenarios executed
• Results observed
• User sign-off recorded
• Phase 5 artifact written

Enforcement

Before setting Status: LOCKED:

1. Scan artifact for any [ ] unchecked boxes
2. If found: complete the work OR convert to addendum
3. Verify ALL boxes are [x] checked
4. Only then proceed to lock

Common Anti-Patterns

Anti-Pattern	Correct Approach
"Will complete later"	Complete now or create addendum
Partial checkoff	Check only when fully complete
Vague items like "Do work"	Specific: "Implement auth handler"
No TODO section	Required in every phase artifact

Sequential Phase Isolation (Mandatory, No Parallel Phase Work)

• The workflow is strictly sequential: exactly one active phase per run at any time.
• Active phase = the earliest phase whose base artifact is missing or not lock-valid.
• Do not create, update, or lock artifacts for any later phase while the active phase is unresolved.
• Never keep more than one phase base artifact in DRAFT at the same time.
• If multiple phase artifacts are DRAFT, treat only the earliest DRAFT phase as active; later DRAFT artifacts are invalid parallel prework and must not be continued until the active phase is lock-valid.
• After the active phase is lock-valid, continue sequentially and recreate/overwrite any invalid later-phase DRAFT artifacts only when those phases become active.

Run Folder and Artifacts

• Primary run path: .codex/rlm/<run-id>/
• Per-run artifacts:
  • 00-worktree.md (REQUIRED - Phase 0 worktree setup)
  • 00-requirements.md
  • 01-as-is.md
  • 01.5-root-cause.md (optional, for debug mode)
  • 02-to-be-plan.md
  • 03-implementation-summary.md
  • 04-test-summary.md
  • 05-manual-qa.md
  • addenda/
  • evidence/ (screenshots/logs/perf/traces; referenced from Phase 4/5)
• Global artifacts:
  • .codex/DECISIONS.md
  • .codex/STATE.md
• Worktree location (isolated):
  • .worktrees/<run-id>/ (default, project-local, hidden)
  • Or ~/.config/rlm-workflow/worktrees/<project>/<run-id>/ (global)
• Skills (for reference):
  • skills/rlm-worktree/SKILL.md - Phase 0 worktree isolation
  • skills/rlm-tdd/SKILL.md - TDD discipline for Phase 3
  • skills/rlm-debugging/SKILL.md - Systematic debugging for Phase 1.5
• Scripts (utilities):
  • scripts/install-rlm-workflow.py - Cross-platform bootstrap/update
  • scripts/rlm-init.py - Initialize a new run folder + templates (cross-platform)
  • scripts/rlm-init.ps1 - Initialize a new run folder + templates (PowerShell equivalent)
  • scripts/rlm-status.py - Run status + lock chain summary (cross-platform)
  • scripts/rlm-status.ps1 - Run status + lock chain summary (PowerShell equivalent)
  • scripts/lint-rlm-run.py - Artifact structure + TODO discipline linter (cross-platform)
  • scripts/lint-rlm-run.ps1 - Artifact structure + TODO discipline linter (PowerShell equivalent)
  • scripts/verify-locks.py - Automated lock hash verification (cross-platform)
  • scripts/verify-locks.ps1 - Automated lock hash verification (PowerShell equivalent)

Phase Execution Protocol

1. Identify phase input base files from .agent/PLANS.md.
2. Expand each input to effective input: base file plus stage-local addenda in lexical order.
3. Read all effective inputs before drafting output.
4. Create/update the phase artifact with required header fields:
   • Run, Phase, Status, Inputs, Outputs, Scope note
5. Include a Traceability section mapping each R# to where it is addressed and evidenced.
6. End with Coverage Gate and Approval Gate, each concluding with explicit PASS or FAIL.
7. Keep Status: DRAFT until both gates pass.
8. On pass, lock artifact:
   • Set Status: LOCKED
   • Add LockedAt (ISO8601)
   • Add LockHash (SHA-256 of normalized artifact content; see /.agent/PLANS.md / references/plans-canonical.md)

Use references/artifact-template.md for exact header and gate scaffolding.

Mandatory PLANS Sections to Enforce

Always enforce these sections from .agent/PLANS.md when applicable:

• Large requirements: Implementation sub-phases (required when scope is large or risky)
• Playwright tagging for RLM runs and implementation sub-phases (required)
• Testing discipline (TDD + Playwright) sections for Phase 2, 4, and 5
• RLM TDD Discipline (Phase 3) - RED-GREEN-REFACTOR cycle, The Iron Law
• RLM Systematic Debugging (Phase 1.5) - When and how to use debug mode
• RLM single-command orchestration ("Implement requirement '<run-id>'")
• Run folder resolution
• Phase auto-resume and phase selection
• Phase transition hard-stop lock chain (required)
• Strict sequential phase execution (no parallel phase work)
• Manual QA stop (the only intentional pause)
• Locking rules for single-command execution

Immutability and Addenda

• Never edit a locked prior-phase artifact.
• If a gap is discovered in a locked upstream artifact, create an upstream-gap addendum in the current phase.
• Addendum naming:
  • Stage-local: <base>.addendum-01.md
  • Upstream-gap: <current>.upstream-gap.<prior>.addendum-01.md
• Lock all addenda created in the active phase when that phase locks.

Phase Expectations

0. Phase 0 (00-worktree.md) - Isolation REQUIRED

   • Trigger: At start of every RLM run, before any other work.
   • The Iron Law: NEVER WORK ON MAIN/MASTER BRANCH WITHOUT EXPLICIT CONSENT.
   • Create isolated git worktree at .worktrees/<run-id>/ (or configured location).
   • Verify worktree directory is git-ignored (if project-local).
   • Run project setup (auto-detect: npm install, cargo build, pip install, etc.).
   • Verify clean test baseline (all tests passing).
   • Document worktree location, branch name, baseline status.
   • Skill: skills/rlm-worktree/SKILL.md

1. Phase 0 Requirements (00-requirements.md)

   • Define stable IDs R1..Rn and OOS1..OOSn.
   • Define observable acceptance criteria for each R#.
   • User-created first to initialize the run.

2. Phase 1 AS-IS (01-as-is.md)

   • Provide novice-runnable repro, current behavior, code pointers, known unknowns.
   • Execute in worktree context.

3. Phase 1.5 (01.5-root-cause.md) - Debug Mode (optional)

   • Trigger: Use when requirement involves fixing a bug or investigating unexpected behavior.
   • The Iron Law: NO FIXES WITHOUT ROOT CAUSE INVESTIGATION FIRST.
   • Follow systematic debugging: error analysis -> reproduction -> data flow tracing -> hypothesis testing -> root cause summary.
   • Must be LOCKED before Phase 2 when present.
   • Skill: skills/rlm-debugging/SKILL.md

4. Phase 2 (02-to-be-plan.md)

   • Produce ExecPlan-grade plan with concrete file edits, commands, tests, manual QA scenarios.
   • Add implementation sub-phases (SP1, SP2, ...) when scope/risk is large.
   • If Phase 1.5 exists: incorporate root cause findings into fix plan.

5. Phase 3 (03-implementation-summary.md) - TDD Discipline + Parallelization

   • The Iron Law: NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST.
   • Must include TDD Compliance Log documenting RED-GREEN-REFACTOR cycles.
   • Parallel Mode (Subagent): If 3+ independent sub-phases and subagent spawning available:
     • Dispatch fresh subagent per sub-phase
     • Two-stage review: spec compliance -> code quality
     • Review loops until approved
     • Integration testing after all sub-phases complete
   • Sequential Mode (Fallback): If subagents unavailable:
     • Execute sub-phases sequentially in main agent
     • Extended self-review checklist
     • Integration testing between each sub-phase
   • Skill: skills/rlm-tdd/SKILL.md for TDD, skills/rlm-subagent/SKILL.md for parallelization

6. Phase 3.5 (03.5-code-review.md) - Code Review (optional)

   • Trigger: Large changes, critical paths, or extra confidence needed
   • When to use: High-risk changes, complex sub-phases, or when external validation is needed
   • Parallel Mode: Dispatch code-reviewer subagent
   • Sequential Mode: Main agent self-review with extended checklist
   • Must be LOCKED before Phase 4 if used
   • Skill: skills/rlm-subagent/SKILL.md

7. Phase 4 (04-test-summary.md) - Parallel Testing

   • Before running tests, audit the implementation in 03-implementation-summary.md against 00-requirements.md and 02-to-be-plan.md; document mismatches, addenda, or confirmations.
   • Record concrete validation commands, results, and requirement coverage.
   • Verify TDD compliance: all tests passing that were written in Phase 3.
   • Parallel Mode: Dispatch subagents for independent test suites:
     • Subagent 1: Unit tests
     • Subagent 2: Integration tests
     • Subagent 3: E2E Tier A
     • All run concurrently, results aggregated
   • Sequential Mode: Run test suites sequentially in main agent

8. Phase 5 (05-manual-qa.md)

   • Pause for user sign-off; record observed outcomes and explicit approval.

9. Phase 6 and 7

   • Update .codex/DECISIONS.md, then .codex/STATE.md.
   • Changes are in worktree context; user merges feature branch when ready.

RLM Skill Priority

When a requirement involves multiple concerns, use this priority order to determine which skills/phases to apply first:

Priority Order

1. Debugging (bug fixes) -> Run Phase 1.5 Root Cause Analysis first

   • Trigger: Requirement mentions bug, test failure, or unexpected behavior
   • Action: Insert Phase 1.5 between Phase 1 and Phase 2
   • Skill: skills/rlm-debugging/SKILL.md
   • Why: Understanding root cause is prerequisite to planning the fix

2. Design/Analysis (new features or changes) -> Run full Phase 1 AS-IS Analysis

   • Trigger: New feature, enhancement, or behavior modification
   • Action: Execute Phase 1 thoroughly before Phase 2
   • Why: Must understand current state before defining future state

3. Implementation -> Proceed to Phase 2+ after analysis complete

   • Trigger: Phase 1 (or 1.5) is locked and ready
   • Action: Begin Phase 2 (TO-BE planning)
   • Why: Plans require complete understanding of current/debugging state

4. Testing -> Use TDD discipline in Phase 3

   • Trigger: Any implementation work
   • Action: Apply TDD in Phase 3
   • Skill: skills/rlm-tdd/SKILL.md
   • Why: Tests validate implementation against requirements

5. Review -> Code review between implementation and final validation

   • Trigger: Implementation complete (Phase 3 locked)
   • Action: Optional Phase 3.5 Code Review before Phase 4
   • Why: Catch issues before final validation

Decision Flow

Requirement received
  |
  v
Is it a bug fix? --YES--> Phase 1.5 (Root Cause Analysis)
  |                          |
  NO                         v
  |                    Phase 2 (incorporate findings)
  v                          v
Phase 1 (AS-IS) -------> Phase 3 (TDD implementation)
  |                          |
  v                          v
Phase 2 (TO-BE) -------> Phase 4 (validation)
  |                          |
  v                          v
Phase 3 (TDD) ---------> Phase 5 (Manual QA)
                             |
                             v
                       Phase 6/7 (global updates)

Examples

Requirement	Priority Applied	Execution Order	Execution Mode
"Fix login crash"	Debugging first	Phase 0 -> 1 -> 1.5 -> 2 -> 3 -> 4 -> 5...	Sequential or Parallel
"Add dark mode"	Design first	Phase 0 -> 1 -> 2 -> 3 -> 4 -> 5...	Sequential (single SP)
"Crash on empty input"	Debugging first	Phase 0 -> 1 -> 1.5 -> 2 -> 3 -> 4...	Sequential or Parallel
"Implement OAuth"	Design + Review	Phase 0 -> 1 -> 2 -> 3 -> 3.5 -> 4 -> 5...	Parallel (multiple SPs)
"Multi-domain refactor"	Design + Parallel	Phase 0 -> 1 -> 2 -> 3 -> 3.5 -> 4 -> 5...	Parallel (subagents)

Execution Mode Legend:

• Sequential: Single sub-phase, no parallelism needed
• Parallel: Multiple sub-phases, subagents available -> concurrent execution
• Sequential or Parallel: Mode determined by subagent availability check

Hard Gates

Hard gates are non-negotiable checkpoints that MUST be satisfied before proceeding.

### Phase 0 -> 1/2 Hard Gate

Do NOT proceed to Phase 1 or 2 until:

• Phase 0 worktree is created and verified
• Worktree directory is git-ignored (if project-local)
• Clean test baseline is verified
• Main branch protection is confirmed
• Phase 0 artifact is LOCKED with LockedAt and LockHash

Exception: None. Phase 0 is REQUIRED for all runs.

### Phase 1 -> 2 Hard Gate

Do NOT create 02-to-be-plan.md until 01-as-is.md is LOCKED with:

• Coverage: PASS
• Approval: PASS
• LockedAt and LockHash populated

Exception: If Phase 1.5 exists, it must ALSO be locked before Phase 2.

### Phase 1.5 -> 2 Hard Gate (Debug Mode)

Do NOT create TO-BE plan until root cause analysis is complete:

• Phase 1.5 artifact is LOCKED
• Root cause identified (not just symptoms)
• Fix strategy defined
• Coverage: PASS
• Approval: PASS

Exception: None. Debug mode requires completion before planning.

### Phase 3 TDD Hard Gate

Do NOT write implementation code until:

• Failing test exists and has been run
• Test failure is documented in Phase 3 artifact TDD Compliance Log
• RED phase is verified with actual test output

Exception: None. The Iron Law has no exceptions.

### Phase 4 -> 5 Hard Gate

Do NOT proceed to Manual QA until:

• Implementation audit is documented in Phase 4 artifact (against 00-requirements.md and 02-to-be-plan.md)
• All tests from Phase 3 are passing
• TDD Compliance is verified
• Test evidence is documented in Phase 4 artifact
• Phase 4 is LOCKED

### Phase 5 Manual QA Hard Gate

Do NOT update DECISIONS.md or STATE.md until:

• User has explicitly signed off on QA scenarios
• 05-manual-qa.md contains observed results for all scenarios
• Approval: PASS with user name/date recorded
• Phase 5 is LOCKED with LockHash matching content

Exception: None. Global updates require QA completion.

### Lock Chain Hard Gate (Applies to ALL transitions)

Do NOT start Phase N unless ALL prior phases (0 through N-1) are lock-valid:

• Status: LOCKED
• LockedAt: populated
• LockHash: matches SHA-256 of content
• Coverage: PASS
• Approval: PASS

Exception: None. The lock chain is absolute.

Execution Modes: Parallel vs Sequential

RLM supports two execution modes for Phase 3 (Implementation) and Phase 4 (Testing):

Parallel Mode (Subagent-Driven)

Requirements:

• Subagent spawning capability available
• 3+ independent sub-phases defined
• Sub-phases don't share files or have minimal dependencies

Benefits:

• 3-5x faster execution for multiple sub-phases
• Fresh context per sub-phase (no confusion)
• Independent review by separate subagents
• Natural TDD enforcement

Process:

1. Controller extracts all sub-phases from Phase 2 plan
2. Dispatches implementer subagent per sub-phase (parallel)
3. Each implementer: implements, tests, commits
4. Dispatches spec reviewer per sub-phase (parallel)
5. Dispatches code reviewer per sub-phase (parallel, after spec passes)
6. Review loops if issues found
7. Integration testing after all approved

Documentation: Mode and subagent usage recorded in Phase 3 artifact

Sequential Mode (Fallback)

Trigger:

• Subagent spawning not available in current environment
• User explicitly requests sequential execution
• Subagent capability check fails

Characteristics:

• Sub-phases executed sequentially in main agent
• Extended self-review checklist
• Integration testing between each sub-phase
• Slower but equally rigorous

Fallback trigger flow:

**Subagent Check:** NOT AVAILABLE
**Reason:** [Tool not found / Platform limitation / User request]
**Action:** Using SEQUENTIAL fallback mode

Mode Detection

Automatic detection at start of Phase 3:

1. Attempt to determine subagent capability
2. If available -> Use PARALLEL mode
3. If unavailable -> Use SEQUENTIAL mode with explicit documentation

Platform-specific detection:

• Claude Code: Check for Task tool
• Codex: Check native subagent support
• OpenCode: Check skill tool capabilities
• Cursor: Limited subagent support -> usually sequential

User Override

User can explicitly request mode:

"Implement requirement 'X' using parallel subagents"
-> Attempt parallel, fallback if unavailable

"Implement requirement 'X' with sequential execution"
-> Force sequential even if subagents available

Mode Comparison

Aspect	Parallel Mode	Sequential Mode
Execution	Concurrent subagents	Sequential in main agent
Speed	3-5x faster	Linear
Review	Independent subagent reviewers	Self-review
Context	Fresh per sub-phase	Accumulates
Rigor	Two-stage external review	Extended self-review
Fallback	Automatic if unavailable	Default mode

Maintaining Quality in Both Modes

Parallel Mode Quality:

• Two-stage review (spec + code quality)
• Independent verification
• Review loops for fixes

Sequential Mode Quality:

• Extended self-review checklist
• Explicit verification steps
• Regression testing between sub-phases

Both modes enforce:

• TDD discipline
• Artifact locking
• Gate compliance
• Integration testing

Manual QA Pause Rule

Pause only during Phase 5 for explicit user validation/sign-off. Do not pause for approval in other phases when gates can be evaluated mechanically.

Operating Rules

• Keep prompts short and path-based; keep substantive requirements and plans in repo documents.
• Use deterministic, reproducible commands for implementation and validation.
• If required input is missing, create the minimal current-phase addendum; do not back-edit locked history.