Wiring Verification

When building infrastructure components, ensure they're actually invoked in the execution path.

Pattern

Every module needs a clear entry point. Dead code is worse than no code - it creates maintenance burden and false confidence.

The Four-Step Wiring Check

Before marking infrastructure "done", verify:

Entry Point Exists: How does user action trigger this code?
Call Graph Traced: Can you follow the path from entry to execution?
Integration Tested: Does an end-to-end test exercise this path?
No Dead Code: Is every built component actually reachable?

DO

Verify Entry Points

# Hook registered?
grep -r "orchestration" .claude/settings.json

# Skill activated?
grep -r "skill-name" .claude/skill-rules.json

# Script executable?
ls -la scripts/orchestrate.py

# Module imported?
grep -r "from orchestration_layer import" .

Trace Call Graphs

# Entry point (hook)
.claude/hooks/pre-tool-use.sh
  ↓
# Shell wrapper calls TypeScript
npx tsx pre-tool-use.ts
  ↓
# TypeScript calls Python script
spawn('scripts/orchestrate.py')
  ↓
# Script imports module
from orchestration_layer import dispatch
  ↓
# Module executes
dispatch(agent_type, task)

Test End-to-End

# Don't just unit test the module
pytest tests/unit/orchestration_layer_test.py  # NOT ENOUGH

# Test the full invocation path
echo '{"tool": "Task"}' | .claude/hooks/pre-tool-use.sh  # VERIFY THIS WORKS

Document Wiring

## Wiring

- **Entry Point**: PreToolUse hook on Task tool
- **Registration**: `.claude/settings.json` line 45
- **Call Path**: hook → pre-tool-use.ts → scripts/orchestrate.py → orchestration_layer.py
- **Test**: `tests/integration/task_orchestration_test.py`

DON'T

Build Without Wiring

# BAD: Created orchestration_layer.py with 500 lines
# But nothing imports it or calls it
# Result: Dead code, wasted effort

# GOOD: Start with minimal wiring, then expand
# 1. Create hook (10 lines)
# 2. Test hook fires
# 3. Add script (20 lines)
# 4. Test script executes
# 5. Add module logic (iterate)

Create Parallel Routing

# BAD: Agent router has dispatch logic
# AND skill-rules.json has agent selection logic
# AND hooks have agent filtering logic
# Result: Three places to update, routing conflicts

# GOOD: Single source of truth for routing
# skill-rules.json activates skill → skill calls router → router dispatches

Assume Imports Work

# BAD: Assume because you wrote the code, it's imported
from orchestration_layer import dispatch  # Does this path exist?

# GOOD: Verify imports at integration test time
uv run python -c "from orchestration_layer import dispatch; print('OK')"

Skip Integration Tests

# BAD: Only unit test
pytest tests/unit/  # All pass, but nothing works end-to-end

# GOOD: Integration test the wiring
pytest tests/integration/  # Verify full call path

Common Wiring Gaps

Hook Not Registered

// .claude/settings.json - hook definition exists but not in hooks section
{
  "hooks": {
    "PreToolUse": []  // Empty! Your hook never fires
  }
}

Fix: Add hook registration:

{
  "hooks": {
    "PreToolUse": [{
      "matcher": ["Task"],
      "hooks": [{
        "type": "command",
        "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/orchestration.sh"
      }]
    }]
  }
}

Script Not Executable

# Script exists but can't execute
-rw-r--r-- scripts/orchestrate.py

# Fix: Make executable
chmod +x scripts/orchestrate.py

Module Not Importable

# Script tries to import but path is wrong
from orchestration_layer import dispatch
# ModuleNotFoundError

# Fix: Add to Python path or use proper package structure
sys.path.insert(0, str(Path(__file__).parent.parent))

Router Has No Dispatch Path

# BAD: Router has beautiful mapping
AGENT_MAP = {
    "implement": ImplementAgent,
    "research": ResearchAgent,
    # ... 18 agent types
}

# But no dispatch function uses the map
def route(task):
    return "general-purpose"  # Hardcoded! Map is dead code

# GOOD: Dispatch actually uses the map
def route(task):
    agent_type = classify(task)
    return AGENT_MAP[agent_type]

Wiring Checklist

Before marking infrastructure "complete":

Entry point identified and tested (hook/skill/CLI)
Call graph documented (entry → module execution)
Integration test exercises full path
No orphaned modules (everything imported/called)
Registration complete (settings.json/skill-rules.json)
Permissions correct (scripts executable)
Import paths verified (manual import test passes)

Real-World Examples

Example 1: DAG Orchestration (This Session)

What was built:

opc/orchestration/orchestration_layer.py (500+ lines)
opc/orchestration/dag/ (DAG builder, validator, executor)
18 agent type definitions
Sophisticated routing logic

Wiring gap:

No hook calls orchestration_layer.py
No script imports the DAG modules
Agent routing returns hardcoded "general-purpose"
Result: 100% dead code

Fix:

Create PreToolUse hook for Task tool
Hook calls scripts/orchestrate.py
Script imports and calls orchestration_layer.dispatch()
Dispatch uses AGENT_MAP to route to actual agents
Integration test: Submit Task → verify correct agent type used

Example 2: Artifact Index (Previous Session)