Configuration

Execute Phase 2: Build with the Power Trio committee using Test-Driven Development.

This phase handles all code modification tasks including:

• Implementing new features
• Extending existing functionality
• Fixing bugs and errors
• Refactoring existing code
• Improving or optimizing implementations
• Writing tests for existing functionality

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Configuration

Key parameters for this phase (see parameters skill):

• MAX_TEST_ITERATIONS - Maximum rounds of test revision
• MAX_IMPL_ITERATIONS - Maximum rounds of implementation revision
• MAX_TEST_FIX_ATTEMPTS - Maximum attempts to fix failing tests
• MAX_BLOCKS_PER_AGENT - Maximum blocks per agent before escalation
• EXPECTED_TEST_CONVERGENCE - Expected maximum test iterations
• EXPECTED_IMPL_CONVERGENCE - Expected maximum implementation iterations

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You are orchestrating Phase 2: Build. This phase enforces TDD: tests are written and approved BEFORE implementation begins.

Start by announcing who you are and succinctly what your approach will be.

Task

Execute code changes based on: $ARGUMENTS

If no arguments provided, look for .power-trio/plan.report.md. If that doesn't exist, ask the user what they want to do.

If it is incomplete or unclear, this is the ideal time to ask the user for clarification before proceeding.

Committee Members

Agent	Role
power-trio:test-author	Writes tests first, defines correctness
power-trio:engineer	Implements code to pass tests
power-trio:senior-engineer	Reviews tests and code for quality

Orchestration Protocol

Setup

Read the plan if available:

Read(file_path=".power-trio/plan.report.md")

Initialize state:

stage: "TEST_CREATION"
test_iterations: 0
impl_iterations: 0
block_counts: {test_author: 0, engineer: 0, senior_engineer: 0}

Execution Constraints (TDD Efficiency + Loop Control)

1. Issue-Scoped Iteration (Orchestrator)

   • Re-invoke only the agent(s) responsible for the block
   • Provide only: the blocking concern and relevant code
   • Do NOT re-run full reviews unless required by the fix

2. Loop Termination Bias

   • When close to consensus: prefer APPROVE with noted limitations over another BLOCK
   • Prefer documenting cleanup as future task
   • Assume Phase 3 exists to catch production-level concerns

3. Expected Convergence Envelope

   • Test creation + review: EXPECTED_TEST_CONVERGENCE iterations
   • Implementation + review: EXPECTED_IMPL_CONVERGENCE iterations
   • Long loops indicate over-blocking or over-scoping

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STAGE 1: Test Creation and Review

You should always ask the user if they want tests to be written. If they say no, proceed to implementation.

Important: only invoke the test creation and senior review steps if there is already an existing testing framework in place.

Step 1.1: Create Tests

Invoke test-author to write tests FIRST (before any implementation):

Task(subagent_type="power-trio:test-author", prompt="Based on this plan, write tests that define correctness. Tests should cover critical success criteria, edge cases, and error cases.\n\nFor new functionality: Write tests that will FAIL initially (no implementation exists yet).\nFor bug fixes: Write tests that reproduce the bug and verify the fix.\nFor refactoring: Write tests that verify behavior is preserved.\n\nPlan:\n[PLAN.REPORT CONTENT]\n\nCreate test files and provide the test specification.")

Step 1.2: Review Tests

Invoke senior-engineer to review the tests:

Task(subagent_type="power-trio:senior-engineer", prompt="Review these tests for completeness and correctness (STAGE: TEST_REVIEW). Do they properly specify the expected behavior from the plan?\n\nPlan:\n[PLAN.REPORT CONTENT]\n\nTests:\n[TEST-AUTHOR OUTPUT]\n\nReview and vote APPROVE or BLOCK with REASON.")

Step 1.3: Test Iteration

Parse senior-engineer's vote:

If APPROVE: Proceed to Stage 2 (Implementation)

If BLOCK:

1. Increment block_counts.senior_engineer

2. Check escalation (MAX_BLOCKS_PER_AGENT blocks → convert to documented concern)

3. Issue-scoped iteration - Have test-author revise with only the specific concern:

   Task(subagent_type="power-trio:test-author", prompt="Revise tests to address this specific concern:\n\n[SENIOR ENGINEER'S BLOCKING CONCERN - max MAX_BLOCKING_ISSUES_PER_ITERATION_SE issues]\n\nMake minimal, targeted changes. Do NOT refactor unrelated tests.\n\nCurrent tests:\n[ONLY THE AFFECTED TEST(S)]\n\nUpdate the tests and provide the revised specification.")
   

4. Loop back to Step 1.2 (re-invoke only senior-engineer with targeted context)

Maximum test iterations: MAX_TEST_ITERATIONS Expected convergence: EXPECTED_TEST_CONVERGENCE iterations

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STAGE 2: Implementation

Step 2.1: Implement Code

Once tests are approved, invoke engineer:

Task(subagent_type="power-trio:engineer", prompt="Implement code to make these approved tests pass. Follow the plan exactly.\n\nFor new features: Write the implementation from scratch.\nFor bug fixes: Modify existing code to fix the issue.\nFor refactoring: Restructure code while maintaining test coverage.\n\nPlan:\n[PLAN.REPORT CONTENT]\n\nApproved Tests:\n[APPROVED TESTS]\n\nWrite the implementation and run the tests.")

Step 2.2: Verify Tests Pass

The engineer should run tests. If they report failures, require diagnosis:

Task(subagent_type="power-trio:engineer", prompt="Tests are failing. Before fixing, diagnose the root cause.\n\nTest failures:\n[FAILURE OUTPUT]\n\nCurrent implementation:\n[ENGINEER'S CODE]\n\nExplicitly state:\n1. Root cause of the failure\n2. Whether this indicates: bug in implementation, flaw in test, or mismatch with plan\n3. Your fix approach\n\nThen fix the code and run tests again. Avoid blind retries - each attempt must add new understanding.")

Loop until tests pass (max MAX_TEST_FIX_ATTEMPTS attempts).

If tests never pass after MAX_TEST_FIX_ATTEMPTS: stop and report blocker to user.

Step 2.3: Code Review

Once tests pass, invoke senior-engineer for implementation review:

Task(subagent_type="power-trio:senior-engineer", prompt="Review this implementation for code quality (STAGE: IMPLEMENTATION_REVIEW). Tests are passing.\n\nPlan:\n[PLAN.REPORT CONTENT]\n\nTests:\n[APPROVED TESTS]\n\nImplementation:\n[ENGINEER OUTPUT]\n\nVerify tests pass legitimately and review code quality. Vote APPROVE or BLOCK with REASON.")

Step 2.4: Implementation Iteration

Parse senior-engineer's vote:

If APPROVE: Proceed to Artifact Creation

If BLOCK:

1. Increment block_counts.senior_engineer

2. Check escalation (MAX_BLOCKS_PER_AGENT blocks → convert to documented concern)

3. Issue-scoped iteration - Have engineer fix with only the specific concern:

   Task(subagent_type="power-trio:engineer", prompt="Address this specific code review feedback:\n\n[SENIOR ENGINEER'S BLOCKING CONCERN - max MAX_BLOCKING_ISSUES_PER_ITERATION_SE issues]\n\nMake minimal, targeted changes. Do NOT refactor unrelated code.\n\nCurrent implementation:\n[ONLY THE AFFECTED CODE]\n\nFix the issues surgically and run tests to ensure nothing broke.")
   

4. Loop back to Step 2.3 (re-invoke only senior-engineer with targeted context)

If deviation from plan: Surface once as documented deviation. Do not repeatedly block.

Loop termination bias: When close to consensus, prefer APPROVE with noted limitations.

Maximum implementation iterations: MAX_IMPL_ITERATIONS Expected convergence: EXPECTED_IMPL_CONVERGENCE iterations

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STAGE 3: Artifact Creation

When implementation is approved, create implementation.report.md:

Write(file_path=".power-trio/implementation.report.md", content="[ARTIFACT]")

Artifact format:

# Implementation Report

## Task

[From plan.report or user request - describe what was built, fixed, or improved]

## Files Changed

| File         | Change Type | Description |
| ------------ | ----------- | ----------- |
| path/to/file | Added       | Description |

## Lines of Code

- Added: [X]
- Modified: [X]
- Deleted: [X]
- Total: [X]

## Test Results

- Test files: [list]
- Test cases: [X] total
- Passing: [X]
- Command: `[test command]`

## Deviations from Plan

[None or list with justification]

## Dependencies

- New dependencies: [list or None]
- External APIs: [list or None]

## Sensitive Areas Touched

- Authentication: Yes/No
- Payments: Yes/No
- Cryptography: Yes/No
- User data: Yes/No
- Public API: Yes/No

## Committee Approval

- Test Author: Tests approved
- Engineer: Implementation complete
- Senior Engineer: APPROVE

## Iterations

- Test iterations: [X]
- Implementation iterations: [X]

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Generated by Power Trio Phase 2: Build

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Output Summary

Announce completion:

Phase 2: Build COMPLETE

TDD workflow completed:
- Test iterations: [X]
- Implementation iterations: [X]

All tests passing. Code approved by Senior Engineer.

Artifact: .power-trio/implementation.report.md

Files changed: [X]
Lines of code: [X]
Sensitive areas: [list if any]

[If sensitive areas or significant changes:]
Recommend running Phase 3: Review (/power-trio:review)

[Otherwise:]
Ready to ship or run Phase 3 for additional assessment.

Error Handling

• If tests never pass after MAX_TEST_FIX_ATTEMPTS attempts: stop and report blocker to user
• If agent fails to respond: retry once, then ask user
• If no plan.report found: ask user for requirements