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📝 Prompt Template Linter
The Prompt Template Linter is a specialized diagnostic tool designed to sanitize and optimize LLM prompt templates before they reach production.
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See it in action
You say
Lint the prompt templates in the /prompts directory and check for injection risks and missing variables.
Your agent does
Findings:
- [PTL001] SEVERE: /prompts/user_gen.j2 (Line 12) - Untrusted variable 'user_input' interpolated into instruction region.
- [PTL002] WARNING: /prompts/summary.md (Line 4) - Placeholder 'date_range' is defined but never used in the template.
What you get
About this skill
What it does
The Prompt Template Linter is a specialized diagnostic tool designed to sanitize and optimize LLM prompt templates before they reach production. It scans your template files to identify structural flaws, security risks, and logical inconsistencies that often lead to model hallucinations or prompt injection vulnerabilities.
Why use this skill
Manually auditing prompts for "jailbreak" surfaces or missing variables is error-prone. This skill automates the detection of critical issues like unescaped user input in instruction blocks, contradictory constraints, and orphaned placeholders. It ensures your prompts are robust, type-safe (where variables are concerned), and formatted for reliable parsing.
Supported tools
- File Formats: Supports .prompt, .txt, .md, .jinja, and .j2 files.
- Integration: Works via CLI or stdin, making it ideal for pre-commit hooks or CI/CD pipelines.
- Remediation: Includes a library of safe-snippet references to fix flagged issues instantly.
Output format
The skill produces a structured report categorized by rule ID (PTL001-PTL006) and severity, pinpointing the exact line and file where the issue resides.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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Creator
JustHandled Labs builds focused agent skills for the work nobody wants to do by hand. Each one is a single repeatable job done well: catching the security and data mistakes that quietly ship, keeping docs and tests honest, gating the commands an agent is about to run, sharpening writing, and handling the founder chores around launches, outreach, and brand setup. Not generic AI productivity. Specific workflows that are easy to run, review, and repeat. Maintained by H.J. Westerfield, with a background in communications, editing, project coordination, customer support, and practical AI systems. Tools for people who want useful automation without theatrical complexity.
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