---
description: Resume or start track implementation following TDD protocol
agent: tier2-tech-lead
---

# /conductor-implement

Resume or start implementation of the active track following TDD protocol.

## Prerequisites
- Run `/conductor-setup` first to load context
- Ensure a track is active (has `[~]` tasks)

## Implementation Protocol

1. **Identify Current Task:**
   - Read active track's `plan.md`
   - Find the first `[~]` (in-progress) or `[ ]` (pending) task
   - If phase has no pending tasks, move to next phase

2. **Research Phase (MANDATORY):**
   Before implementing, use tools to understand context:
   - `py_get_code_outline` on target files
   - `py_get_skeleton` on dependencies
   - `grep` for related patterns
   - `get_git_diff` for recent changes
   - Audit `__init__` methods for existing state

3. **TDD Cycle:**

   ### Red Phase (Write Failing Tests)
   - Stage current progress: `git add .`
   - Delegate test creation to @tier3-worker:
     ```
     @tier3-worker
     
     Write tests for: [task description]
     
     WHERE: tests/test_file.py:line-range
     WHAT: Test [specific functionality]
     HOW: Use pytest, assert [expected behavior]
     SAFETY: [thread-safety constraints]
     
     Use 1-space indentation.
     ```
   - Run tests: `uv run pytest tests/test_file.py -v`
   - **CONFIRM TESTS FAIL** - this is the Red phase

   ### Green Phase (Implement to Pass)
   - Stage current progress: `git add .`
   - Delegate implementation to @tier3-worker:
     ```
     @tier3-worker
     
     Implement: [task description]
     
     WHERE: src/file.py:line-range
     WHAT: [specific change]
     HOW: [API calls, patterns to use]
     SAFETY: [thread-safety constraints]
     
     Use 1-space indentation.
     ```
   - Run tests: `uv run pytest tests/test_file.py -v`
   - **CONFIRM TESTS PASS** - this is the Green phase

   ### Refactor Phase (Optional)
   - With passing tests, refactor for clarity
   - Re-run tests to verify

4. **Commit Protocol (ATOMIC PER-TASK):**
   ```powershell
   git add .
   git commit -m "feat(scope): description"
   $hash = git log -1 --format="%H"
   git notes add -m "Task: [summary]" $hash
   ```
   - Update `plan.md`: Change `[~]` to `[x]` with commit SHA
   - Commit plan update: `git add plan.md && git commit -m "conductor(plan): Mark task complete"`

5. **Repeat for Next Task**

## Error Handling
If tests fail after Green phase:
- Delegate analysis to @tier4-qa:
  ```
  @tier4-qa
  
  Analyze this test failure:
  
  [test output]
  
  DO NOT fix - provide analysis only.
  ```
- Maximum 2 fix attempts before escalating to user

## Phase Completion
When all tasks in a phase are `[x]`:
- Run `/conductor-verify` for checkpoint