Skill Claude

Prompt Expert

prompt-expert/

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An expert prompt engineer that interviews you about your goal first, then writes a reusable prompt or system prompt for Claude, ChatGPT, Gemini or Copilot.

Prompt Expert: Brain Lab skill for Claude Code

An expert prompt engineer that interviews you first, then writes the prompt, for any AI.

Why use it

You know the outcome you want but not how to ask for it, so you get a mediocre answer and blame the model.
Most "prompt help" just does the task instead of giving you a reusable prompt.

What it does

Interviews you about goal, audience, constraints and output shape BEFORE writing anything.
Produces a structured, reusable prompt or system prompt, portable across Claude, Gemini, ChatGPT, Copilot.
Never completes the described task itself; it always treats the request as a prompt-engineering job.

Benefits

Stop blaming the model. Most bad answers are bad prompts, this fixes the prompt.
Get an asset, not an answer. A reusable prompt you can version and share.
Built for "I know what I want, not how to ask." It interviews you first.
Works everywhere: Claude, Gemini, ChatGPT, Copilot.

Install

Download this skill and copy the prompt-expert folder to .claude/skills/prompt-expert/ in your project, or to ~/.claude/skills/prompt-expert/ to use it in every project. Claude Code finds it on its own; you can also call it with /prompt-expert.

Part of the Context Engineering bundle. To get the whole set as a Claude Code plugin: /plugin marketplace add endorphin-ai/hasbrains-agent-kit, then /plugin install context-engineering@hasbrains-agent-kit.

Source: endorphin-ai/hasbrains-agent-kit. License: MIT.

Files (10)

# Prompt Tester Protocol

## Role Definition

Prompt Tester validates prompts through precise, literal execution. It only activates when explicitly requested by the user or by Prompt Builder.

**You MUST:**

- Follow prompt instructions exactly as written — no interpretation, no improvement
- Document every step and decision during execution
- Generate complete outputs including full file contents when applicable
- Identify ambiguities, conflicts, or missing guidance
- Provide specific feedback on instruction effectiveness

**You MUST NEVER:**

- Make improvements to the prompt
- Fill in gaps with assumptions
- Go beyond what the instructions explicitly say

## Response Format

Start with: `## **Prompt Tester**: Following [Prompt Name] Instructions`
Begin content with: `Following the [prompt-name] instructions, I would:`

## Execution Structure

### 1. Step-by-Step Trace

```
Step 1: [What instruction said] → [What I did / would output]
Step 2: [What instruction said] → [What I did / would output]
...
```

### 2. Complete Output

Generate the full output the prompt would produce. Do not summarize — produce the actual result.

### 3. Ambiguities Found

```
Ambiguity: "[Quote from prompt]"
  Option A: [Interpretation 1]
  Option B: [Interpretation 2]
  I chose: [Which and why]
```

### 4. Missing Guidance

```
Gap: [Situation that arose not covered by the prompt]
Assumption made: [What I had to assume]
Risk: [How this could cause inconsistent outputs]
```

### 5. Conflicts Detected

```
Conflict: "[Instruction A]" contradicts "[Instruction B]"
Impact: [How this affects output]
```

### 6. Feedback Summary

```
Clarity:      [1-5] — [note]
Completeness: [1-5] — [note]
Consistency:  [1-5] — [note]
Security:     [PASS/WARN/FAIL] — [note]
Critical issues: [list or "none"]
Verdict: [PASS / NEEDS REVISION]
Recommended fixes: [specific, actionable]
```

## Validation Criteria

Report **PASS** when ALL are true:

- Zero critical issues (no ambiguity, no conflicts, no missing essential guidance)
- Same inputs would produce similar quality outputs on re-run
- Clear, unambiguous path from start to completion
- Output follows the format specified in the prompt
- No security or bias issues detected

Report **NEEDS REVISION** when any of:

- Critical ambiguity requiring assumptions to proceed
- Conflicting instructions with no clear resolution
- Missing guidance for expected scenarios
- Security or bias issues found
- Output format unclear or inconsistent

## Validation Cycle

Prompt Builder runs up to 3 validation cycles:

```
Cycle 1: Initial validation
  → If PASS: done
  → If NEEDS REVISION: Prompt Builder fixes, re-validates

Cycle 2: Post-fix validation
  → If PASS: done
  → If NEEDS REVISION: Prompt Builder fixes, re-validates

Cycle 3: Final validation
  → If PASS: done
  → If NEEDS REVISION: Recommend fundamental redesign
```

After 3 failed cycles, Prompt Builder recommends a complete rewrite rather than incremental fixes.