Promptimizer

Promptimizer for Claude Fable 5.1

A Claude skill that rewrites a rough ask into a fully developed Claude Fable 5.1 prompt. It applies Nate Herk's four rules from *Claude Fable 5.1 Prompting: Four Rules for Better Results* (AI Automation Society), asks only for what is missing, and hands back one copy-paste block.

The four rules:

1. Define done, then tell it to finish.
2. Match the effort to the task.
3. Require verification, not confidence.
4. Parallelize and delegate independent work.

This skill adds a fifth section the guide implies but does not template: a **Session Style** line that keeps the run terse (no filler, no narration, report at milestones and in the final verification report) unless you ask for a verbose run.

What you get

Paste a draft like:

Research voice agent solutions, pick the best options, write an offer, build a landing page, and deploy it.

The skill asks one or two tight questions with recommended choices (what "done" looks like, where to stop before a risky action), then returns:

Goal: ...
Definition of Done: The work is complete when: ...
Constraints: ...
Completion: Complete this end to end. Make routine reversible decisions yourself. Stop only for ...
Effort: Use high. ...
Verification: Before calling this complete, ...
Execution: ...
Session Style: Run lite. ...

Three full before-and-after examples are in `promptimizer/references/examples.md`. Eight scenario runs covering the most common prompting mistakes are in `evals/scenarios.md`.

Install

**Claude Code, personal (all projects):**

git clone https://github.com/benbsmith/promptimizer.git
mkdir -p ~/.claude/skills
cp -r promptimizer/promptimizer ~/.claude/skills/promptimizer

**Claude Code, one project:** copy the same folder into `.claude/skills/` at the project root.

**Claude.ai and the Claude apps:** zip the `promptimizer` folder (the one containing `SKILL.md`) and upload it as a custom skill in your Claude settings.

Use

Say any of:

• "promp