Execute TDD Tasks Skill

This skill orchestrates autonomous execution of TDD task pairs generated by /create-tdd-tasks. It is the TDD counterpart to the standard execute-tasks skill, reusing its session management, wave infrastructure, and execution context sharing while adding TDD-specific agent routing, RED-GREEN-REFACTOR verification, and per-task compliance reporting.

The key difference from standard execute-tasks: this skill routes TDD tasks to the tdd-executor agent (from tdd-tools) which runs a 6-phase TDD workflow, while routing non-TDD tasks to the standard task-executor agent. It verifies TDD compliance (RED verified, GREEN verified, refactored) per task pair and reports aggregate results.

CRITICAL: Complete ALL 9 steps. The workflow is not complete until Step 9: Update CLAUDE.md is evaluated. After completing each step, immediately proceed to the next step without waiting for user prompts (except Step 4 which requires user confirmation).

Plugin Context

This skill is part of the tdd-tools plugin and uses agents from the same plugin:

• tdd-executor agent (Opus) -- 6-phase TDD workflow per task
• test-writer agent (Sonnet) -- parallel test generation (used by tdd-executor internally)

For non-TDD tasks, this skill routes to the task-executor agent from sdd-tools (soft cross-plugin dependency). Since TDD tasks are always generated from SDD tasks via /create-tasks, the sdd-tools plugin is expected to be installed when this skill runs.

Core Principles

1. TDD Compliance First

Every TDD task pair must complete the RED-GREEN-REFACTOR cycle:

• RED: Tests are written and verified to fail before any implementation exists
• GREEN: Implementation is written that makes all tests pass with zero regressions
• REFACTOR: Code is cleaned up while keeping all tests green

2. Strategic Parallelism

Maximize execution throughput without violating TDD sequencing:

• PARALLEL: Multiple test-writing tasks (RED phase) run simultaneously across features
• SEQUENTIAL: Within a single TDD pair, RED must complete before GREEN can start (enforced by dependencies)

3. Reuse execute-tasks Infrastructure

Session management, wave execution, context sharing, and progress tracking all reuse the same patterns from execute-tasks. See references/tdd-execution-workflow.md for TDD-specific extensions.

4. Honest TDD Reporting

Report per-task compliance with the full RED-GREEN-REFACTOR cycle:

• red_verified: Whether tests failed as expected before implementation
• green_verified: Whether all tests pass after implementation
• refactored: Whether code was cleaned up while maintaining green tests
• coverage_delta: Change in test coverage percentage (if measurable)

Orchestration Workflow

This skill orchestrates TDD task execution through a 9-step loop that mirrors the standard execute-tasks orchestration with TDD-specific extensions. See references/tdd-execution-workflow.md for the full TDD wave execution details and references/tdd-verification-patterns.md for TDD phase verification rules.

Step 1: Load References

Read the TDD-specific reference files:

Read: ${CLAUDE_PLUGIN_ROOT}/skills/execute-tdd-tasks/references/tdd-execution-workflow.md
Read: ${CLAUDE_PLUGIN_ROOT}/skills/execute-tdd-tasks/references/tdd-verification-patterns.md

Parse arguments from the invocation:

• --task-group <group> -- Filter tasks to a specific group
• --max-parallel <n> -- Override max concurrent agents per wave
• --retries <n> -- Override retry attempts per task (default: 3)

Step 2: Load and Classify Tasks

Use TaskList to retrieve all tasks. If --task-group was provided, filter to tasks where metadata.task_group matches.

Classify each task by type:

Count and report:

• Total tasks (pending + in_progress + completed)
• TDD pairs identified (test + implementation tasks)
• Non-TDD tasks
• Already completed tasks

Handle edge cases:

• No tasks found: Report "No tasks found for group '{group}'. Use /create-tdd-tasks to generate TDD task pairs from your SDD tasks." and stop.
• All completed: Report a summary of completed tasks including TDD compliance and stop.
• No unblocked tasks: Report which tasks exist and what's blocking them.

Step 3: Build Execution Plan

Resolve max_parallel using precedence:

1. --max-parallel CLI argument (highest priority)
2. max_parallel in .claude/agent-alchemy.local.md
3. Default: 5

Resolve retries using precedence:

1. --retries CLI argument (highest priority)
2. Default: 3

Read .claude/agent-alchemy.local.md if it exists, for TDD-specific settings:

• tdd.strictness -- strict, normal (default), or relaxed
• tdd.coverage-threshold -- Minimum coverage target (default: 80)

Build the dependency graph from all pending tasks (TDD and non-TDD):

1. Collect all pending tasks and their blockedBy relationships
2. Run topological sort to assign dependency levels
3. Assign tasks to waves by dependency level (Wave 1 = no dependencies, Wave 2 = depends only on Wave 1, etc.)
4. Sort within waves by priority: critical > high > medium > low > unprioritized
5. Break ties by "unblocks most others"
6. Cap each wave at max_parallel tasks

Annotate waves with TDD phase labels:

The dependency structure from create-tdd-tasks naturally produces alternating test/implementation waves:

Wave 1: [Test-A, Test-B, Test-C]         -- RED phase (parallel test generation)
Wave 2: [Impl-A, Impl-B, Impl-C]         -- GREEN phase (parallel implementation)
Wave 3: [Test-D, Test-E, Non-TDD-F]      -- RED phase + non-TDD tasks (mixed)
Wave 4: [Impl-D, Impl-E]                  -- GREEN phase

Detect circular dependencies: If tasks remain unassigned after topological sorting, they form a cycle. Report the cycle and attempt to break at the weakest link.

Validate TDD pair cross-references: For each TDD task, verify its paired_task_id references a valid task. Log warnings for orphaned pairs.

Step 4: Present Execution Plan and Confirm

Display the TDD execution plan:

EXECUTION PLAN (TDD Mode)

Tasks to execute: {count} ({tdd_pairs} TDD pairs, {non_tdd} non-TDD tasks)
Retry limit: {retries} per task
Max parallel: {max_parallel} per wave
TDD Strictness: {strict|normal|relaxed}

WAVE 1 ({n} tasks -- RED phase):
  1. [{id}] Write tests for {subject} (RED, paired: #{impl_id})
  2. [{id}] Write tests for {subject} (RED, paired: #{impl_id})

WAVE 2 ({n} tasks -- GREEN phase):
  3. [{id}] {subject} (GREEN, paired: #{test_id})
  4. [{id}] {subject} (GREEN, paired: #{test_id})

WAVE 3 ({n} tasks -- mixed):
  5. [{id}] {subject} (non-TDD)
  6. [{id}] Write tests for {subject} (RED, paired: #{impl_id})

{Additional waves...}

BLOCKED (unresolvable dependencies):
  [{id}] {subject} -- blocked by: {blocker ids}

COMPLETED:
  {count} tasks already completed

Use AskUserQuestion to confirm:

questions:
  - header: "Confirm TDD Execution"
    question: "Ready to execute {count} tasks in {wave_count} waves (max {max_parallel} parallel) with TDD enforcement ({strictness} mode)?"
    options:
      - label: "Yes, start TDD execution"
        description: "Proceed with the TDD execution plan above"
      - label: "Cancel"
        description: "Abort without executing any tasks"
    multiSelect: false

If the user selects "Cancel", report "Execution cancelled. No tasks were modified." and stop.

Step 5: Initialize Execution Directo