Bishnubista Plangate Orchestrate

Orchestrate: Sequential Gate-Based Task Execution

Overview

Execute PLAN.md tasks sequentially with fresh subagents per stage, build gates between implementation and review, and retry loops until each task passes. The orchestrator (you) stays active at every checkpoint — never fire-and-forget.

Prerequisites

Before starting:

1. Read PLAN.md to identify the current phase and its tasks
2. Read the Commands: line from <plangate-manifest> in session context. It contains the pre-resolved typecheck, lint, build, and test commands. If a command is SKIP, skip that stage. If the manifest is not available, fall back to the Stack Commands table below.
3. If .plangate.json exists, its commands override the manifest (see Custom Validation Commands)
4. Create tasks via TaskCreate for all tasks from the target phase

Stack Commands

Select commands based on detected stack. The session hook auto-detects and reports this in <plangate-manifest>.

Custom Validation Commands

If .plangate.json exists in the project root, its commands block overrides the stack-detected defaults:

{
  "commands": {
    "typecheck": "./gradlew compileKotlin",
    "lint": "./gradlew detekt",
    "build": "./gradlew build",
    "test": "./gradlew test"
  }
}

Read this file at the start of orchestration and use its commands throughout the pipeline.

Checkpoint and Resume

Orchestration can be interrupted by context limits, session timeouts, or crashes. To enable resumption, maintain a checkpoint file at .plangate/orchestration-state.json.

Writing Checkpoints

After each stage completes for each task, update the checkpoint file:

{
  "phase": 1,
  "started_at": "2026-02-07T14:30:00Z",
  "tasks": [
    {
      "id": "1.1",
      "text": "Create project structure",
      "status": "complete",
      "stages": {
        "implement": "complete",
        "gate": "complete",
        "review": "complete"
      }
    },
    {
      "id": "1.2",
      "text": "Add health-check endpoint",
      "status": "in_progress",
      "stages": {
        "implement": "complete",
        "gate": "failed",
        "review": "pending"
      },
      "retry_count": 1
    },
    {
      "id": "1.3",
      "text": "Set up error handling",
      "status": "pending",
      "stages": {
        "implement": "pending",
        "gate": "pending",
        "review": "pending"
      }
    }
  ]
}

Reading Checkpoints

When /plangate:orchestrate N is invoked:

1. Check if .plangate/orchestration-state.json exists for phase N
2. If it exists, read it and skip tasks/stages that are already "complete"
3. Resume from the first non-complete task/stage
4. Report: "Resuming phase {N} from task {id} ({stage})"

If no checkpoint exists, start fresh.

Cleaning Up

After all tasks in a phase are complete, archive the checkpoint:

mv .plangate/orchestration-state.json .plangate/orchestration-state-phase-{N}.json

The Pipeline

For each task in the phase:

0. CHECK FOR CHECKPOINT (resume if exists)
   +-- Read .plangate/orchestration-state.json
   +-- Skip completed tasks/stages
   +-- Resume from first incomplete item

1. DISPATCH IMPLEMENTER (implementer agent, Sonnet)
   +-- Full task text + stack commands + project context in prompt
   +-- "Default-and-document" — proceeds with reasonable defaults, rarely blocks
   +-- Implement > write tests > self-validate > commit > report
   +-- Update .plangate/orchestration-state.json

2. RUN BUILD GATE (Bash, no subagent -- objective validation)
   +-- typecheck > lint > build
   +-- If fails: dispatch fix subagent > re-run gate (max 2 retries)
   +-- Update .plangate/orchestration-state.json

3. DISPATCH REVIEWER (reviewer agent, Sonnet)
   +-- Combined spec compliance + code quality with distrust
   +-- If issues found: dispatch fix subagent > re-review (max 2 retries)
   +-- Update .plangate/orchestration-state.json

4. UPDATE PLAN.MD
   +-- Check off completed task
   +-- Update .plangate/orchestration-state.json

5. NEXT TASK

After All Tasks Complete

1. Run full test suite
2. Invoke plangate:gate skill
3. Archive the checkpoint file
4. Print the Pipeline Summary (see below)
5. Offer to finish the phase using /plangate:phase finish

Important: Do NOT update PLAN.md status (e.g., "In Progress" → "Complete") or commit a phase-completion update. That is the responsibility of plangate:phase finish, which owns lifecycle transitions. Committing here would create duplicate commits.

Pipeline Summary

After all tasks complete and the final gate passes, output a summary in this format:

## Phase {N} Orchestration Summary

| Task | Implement | Gate | Review | Retries |
|------|-----------|------|--------|---------|
| {id}: {short title} | PASS | PASS | APPROVED | 0 |
| {id}: {short title} | PASS | PASS (retry 1) | APPROVED | 1 |

**Results:** {total} tasks completed, {retry_total} total retries
**Final gate:** PASSED
**Ready for:** `/plangate:phase finish`

Build the summary from the checkpoint file (.plangate/orchestration-state.json). Count retries per task by checking retry_count fields. This gives the user a clear picture of pipeline health — clean runs (0 retries) mean well-written task specs, while high retry counts suggest tasks need clearer acceptance criteria.

Stage 1: Dispatch Implementer

Launch the implementer agent via the Task tool. Include in the prompt:

• Full task text — paste the complete task description. Never tell the agent to read a file.
• Stack commands — the exact typecheck, lint, build, test commands from the table above
• Scene-setting context — what phase this is, what was done before, what comes after
• Relevant file paths — files the implementer will need to read or modify

The implementer agent will:

1. Review the task and proceed (defaulting on ambiguities and documenting assumptions)
2. Implement the task following existing patterns
3. Write tests for acceptance criteria (testing the actual function, not just helpers)
4. Self-validate (typecheck, lint, build)
5. Commit and report

When the implementer returns:

• Read their report carefully
• Check the Concerns section for documented assumptions (validate they're reasonable)
• If genuinely blocked with questions (rare), answer and re-dispatch
• Update the checkpoint file with implementer stage status
• Proceed to build gate

Stage 2: Build Gate

Run validation directly via Bash (no subagent — this is objective pass/fail):

{TYPECHECK_CMD} && {LINT_CMD} && {BUILD_CMD}

Use the stack-appropriate commands from the table above or from .plangate.json if present.

Note on optional linters: For stacks where the linter is optional (detekt, golangci-lint, clippy, swiftlint), check if the command exists before running (e.g., command -v golangci-lint >/dev/null). Skip with a warning if not installed.

If the build gate fails:

1. Read the error output carefully
2. Dispatch a fix subagent with:
   • The exact error output
   • The files that need fixing
   • Instruction: "Fix ONLY these errors. Do not refactor or change anything else."
3. Re-run the build gate
4. If it fails again after 2 retries, STOP and report to the user

The build gate is non-negotiable. Do not skip it. Do not proceed to review if it fails.

After the build gate passes, update the checkpoint file with gate stage status.

Stage 3: Dispatch Reviewer

Launch the reviewer agent via the Task tool. Include in the prompt:

• Full task spec — the original task text (same as what the implementer received)
• Git diff — run git diff to capture what was implemented
• Implementer's report — include it, but tell the reviewer NOT to trust it

The reviewer agent will independently:

• Read every line of the diff
• Compare implementation against spec requirements
• Check code quality, security, and conventions
• Return verdict: APPROVED or ISSUES_FOUND with file:line references

If the reviewer finds issues:

1. Dispatch a fix subagent with the reviewer's specific issues
2. Re-run the build gate
3. Re-dispatch the reviewer
4. If still failing after 2 retry cycles, STOP and report to the user

Orchestrator discretion on trivial fixes: For simple fixes (1-3 line changes addressing a single, clear issue like a missing clearTimeout or an off-by-one), the orchestrator may skip the re-review and proceed directly if the build gate passes. Use this only when the fix is obviously correct and the original review had no other concerns. When in doubt, re-review.

After the reviewer approves, update the checkpoint file with review stage status.

Stage 4: Update PLAN.md

After a task passes all gates:

1. Read PLAN.md
2. Find the task's checkbox line
3. Change - [ ] to - [x]
4. Write the updated file
5. Update the checkpoint file to mark task as complete

Key Principles

Fresh Subagent Per Stage

Each subagent starts with clean context. The orchestrator (you) maintains continuity between stages. This prevents implementer bias from leaking into review.

Full Context in Prompts

Never make a subagent read files to understand their task. Paste the full task description, relevant code snippets, and stack commands directly into the prompt.

Sequential, Not Parallel

Execute tasks one at a time. Parallel execution causes quality issues — tasks often have implicit dependencies, and parallel commits create merge conflicts.

Orchestrator Stays Active

You (the orchestrator) read every subagent report, run every build gate, and make every dispatch decision. You are the quality gatekeeper.

Red Flags — STOP If You Catch Yourself

• Starting a task without creating TaskCreate entries first
• Dispatching implementer without full task text in the prompt
• Skipping the build gate ("it probably passes")
• Proceeding to reviewer while build gate has failures
• Letting the implementer's report substitute for reviewer verification
• Running tasks in parallel
• Dispatching reviewer without the git diff
• Accepting "close enough" from the reviewer
• Moving to next task with open issues
• Not updating the checkpoint file after each stage

Integration

• Composes with plangate:gate for final validation
• Composes with plangate:phase finish for PR creation
• Updates PLAN.md checkboxes for progress tracking
• Maintains .plangate/orchestration-state.json for checkpoint/resume capability

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