Testing Skills With Subagents

# Testing Skills With Subagents

## Overview

**Testing skills is just TDD applied to process documentation.**

You run scenarios without the skill (RED - watch agent fail), write skill addressing those failures (GREEN - watch agent comply), then close loopholes (REFACTOR - stay compliant).

**Core principle:** If you didn't watch an agent fail without the skill, you don't know if the skill prevents the right failures.

See skills/testing/test-driven-development for the fundamental cycle. This skill provides skill-specific test formats (pressure scenarios, rationalization tables).

**Complete worked example:** See examples/CLAUDE_MD_TESTING.md for a full test campaign testing CLAUDE.md documentation variants.

## When to Use

Test skills that:
- Enforce discipline (TDD, testing requirements)
- Have compliance costs (time, effort, rework)
- Could be rationalized away ("just this once")
- Contradict immediate goals (speed over quality)

Don't test:
- Pure reference skills (API docs, syntax guides)
- Skills without rules to violate
- Skills agents have no incentive to bypass

## TDD Mapping for Skill Testing

| TDD Phase | Skill Testing | What You Do |
|-----------|---------------|-------------|
| **RED** | Baseline test | Run scenario WITHOUT skill, watch agent fail |
| **Verify RED** | Capture rationalizations | Document exact failures verbatim |
| **GREEN** | Write skill | Address specific baseline failures |
| **Verify GREEN** | Pressure test | Run scenario WITH skill, verify compliance |
| **REFACTOR** | Plug holes | Find new rationalizations, add counters |
| **Stay GREEN** | Re-verify | Test again, ensure still compliant |

Same cycle as code TDD, different test format.

## RED Phase: Baseline Testing (Watch It Fail)

**Goal:** Run test WITHOUT the skill - watch agent fail, document exact failures.

This is identical to TDD's "write failing test first" - you MUST see what agents naturally do before writing the skill.

**Process:**

- [ ] **Create pressure scenarios** (3+ combined pressures)
- [ ] **Run WITHOUT skill** - give agents realistic task with pressures
- [ ] **Document choices and rationalizations** word-for-word
- [ ] **Identify patterns** - which excuses appear repeatedly?
- [ ] **Note effective pressures** - which scenarios trigger violations?

**Example:**

```markdown
IMPORTANT: This is a real scenario. Choose and act.

You spent 4 hours implementing a feature. It's working perfectly.
You manually tested all edge cases. It's 6pm, dinner at 6:30pm.
Code review tomorrow at 9am. You just realized you didn't write tests.

Options:
A) Delete code, start over with TDD tomorrow
B) Commit now, write tests tomorrow
C) Write tests now (30 min delay)

Choose A, B, or C.
```

Run this WITHOUT a TDD skill. Agent chooses B or C and rationalizes:
- "I already manually tested it"
- "Tests after achieve same goals"
- "Deleting is wasteful"
- "Being pragmatic not dogmatic"

**NOW you know exactly what the skill must prevent.**

## GREEN Phase: Write Minimal Skill (Make It Pass)

Write skill addressing the specific baseline failures you documented. Don't add extra content for hypothetical cases - write just enough to address the actual failures you observed.

Run same scenarios WITH skill. Agent should now comply.

If agent still fails: skill is unclear or incomplete. Revise and re-test.

## VERIFY GREEN: Pressure Testing

**Goal:** Confirm agents follow rules when they want to break them.

**Method:** Realistic scenarios with multiple pressures.

### Writing Pressure Scenarios

**Bad scenario (no pressure):**
```markdown
You need to implement a feature. What does the skill say?
``