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Prompt Optimizer

Verified

Prompt engineering agent that analyzes, refines, and tests prompts for better LLM output quality, consistency, and token efficiency.

By Anthropic 8,300 v1.3.0 Updated 2026-03-10

Install

Claude Code

Copy the SKILL.md file to your project's .claude/skills/ directory

About This Skill

Prompt Optimizer takes your existing prompts and applies proven prompt engineering techniques to improve output quality, consistency, and token efficiency. It understands the nuances of different LLM architectures and tailors optimization strategies accordingly.

How It Works

  1. Prompt analysis — Evaluates your current prompt for common issues: ambiguity, missing constraints, implicit assumptions, and token waste
  2. Technique application — Applies relevant techniques such as chain-of-thought, few-shot examples, role framing, structured output formats, and negative constraints
  3. Token optimization — Identifies redundant instructions and verbose phrasing that can be condensed without losing meaning
  4. Variant generation — Creates 2-3 optimized variants with different approaches (concise vs. detailed, structured vs. conversational)
  5. Evaluation criteria — Provides a testing rubric with sample inputs so you can objectively compare variant performance

Best For

  • AI engineers building production prompt pipelines
  • Developers integrating LLMs into applications for the first time
  • Teams standardizing prompts across multiple AI features
  • Anyone frustrated by inconsistent LLM outputs

Use Cases

  • Improving prompts for code generation tasks
  • Optimizing system prompts for production AI features
  • Reducing token usage while maintaining output quality
  • Creating prompt templates for repeatable workflows
  • A/B testing prompt variants for quality comparison

Pros & Cons

Pros

  • + Applies proven prompt engineering techniques systematically
  • + Generates multiple variants for A/B testing
  • + Reduces token usage without sacrificing quality
  • + Includes testing rubrics for objective evaluation

Cons

  • - Optimal prompts vary by LLM model — may need re-optimization when switching models
  • - Cannot fully test prompts without actual LLM API calls

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