Prompt injection risk linter

Skill sisodiabhumca/agent-skills/skills/prompt-injection-risk-linter

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Install

npx -y skills add sisodiabhumca/agent-skills --skill prompt-injection-risk-linter

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Vendor-neutral skill to lint agent prompts and untrusted retrieved content for prompt-injection risk patterns and missing safety boundaries.

SKILL.md

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When to invoke

You are building an agent that reads untrusted content (web pages, emails, tickets) and you want a pre-flight safety lint.
You want to add an automated check to prompt templates before deployment.

Inputs needed

--prompt path to a text file containing a system/developer prompt, or combined prompt template.
Optional: --retrieved path to a text file with representative untrusted content.

Workflow

Detect common prompt-injection markers ("ignore previous instructions", requests to reveal hidden prompts, tool/credential exfiltration).
Check for missing boundaries (no explicit statement that retrieved content is untrusted; no tool-use constraints).
Emit a JSON report with severity, evidence snippets, and recommended mitigations.

Output format

JSON report written to --output.

Guardrails

Heuristics only: do not claim the prompt is safe/unsafe with certainty.
Avoid printing full prompt contents to stdout.

Reference code

prompt_injection_risk_linter.py implements a vendor-neutral lint with stdlib regex.