Agent Skill
Prompt Engineer skill
prompt-engineerJeffallan/claude-skillsskills/prompt-engineer/SKILL.md
Writes, refactors, and evaluates prompts for LLMs — generating optimized prompt templates, structured output schemas, evaluation rubrics, and test suites. Use when designing prompts for new LLM applications, refactoring existing prompts for better accuracy or token efficiency, implementing chain-of-thought or few-shot learning, creating system prompts with personas and guardrails, building JSON/function-calling schemas, or developing prompt evaluation frameworks to measure and improve model performance.
always on
93 tokname + description
once used
1,011 tokSKILL.md body
bundled files
6101 KB
repo stars
12kGitHub
Install the Prompt Engineer skill
Skills CLI (Claude Code, Codex, Cursor and others)
npx skills add https://github.com/Jeffallan/claude-skills --skill prompt-engineer
Claude Code, by hand (all projects)
git clone --depth 1 https://github.com/Jeffallan/claude-skills.git /tmp/claude-skills mkdir -p ~/.claude/skills cp -R /tmp/claude-skills/skills/prompt-engineer ~/.claude/skills/prompt-engineer
For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.
What it costs your context
Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.
| When | What loads | Cost |
|---|---|---|
| Every session | Name and description | 93 tok |
| When the agent uses it | The SKILL.md instructions | 1,011 tok |
| Only if opened | 6 bundled files (101 KB) | varies |
Until it is used, prompt-engineer costs about 15× less than the median MCP server we measured (1,362 tokens on every turn). Installing all 67 skills from Jeffallan/claude-skills would load 5,798 tokens of descriptions. Skills vs MCP study
Checks
Our checks found nothing to flag: it follows the Agent Skills specification's naming and size guidelines and doesn't pipe downloads into a shell.
Checked 2026-10-22 · method
What's inside
The headings of its SKILL.md. Read the full file on GitHub.
- Prompt Engineer
- When to Use This Skill
- Core Workflow
- Reference Guide
- Prompt Examples
- Zero-shot vs. Few-shot
- Before/After Optimization
- Constraints
- MUST DO
- MUST NOT DO
- Output Templates
- Coverage Note
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