How do I install the Phi Prompt Guard Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/phi-prompt-guard/SKILL.md and restart Claude Code. Both flows are detailed at https://claudskills.com/install/.

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

ClaudSkills / General / general-misc

Phi Prompt Guard

Category: General · Sub-category: general-misc · Last updated: 2026-05-24

ai:llm

Runtime, prompt-time behavioral guardrail that helps reduce PHI exposure in LLM-assisted workflows by detecting PHI-bearing prompts, avoiding unsafe tool actions that would pull more PHI in, and redirecting users toward de-identified or synthetic inputs. Use when the user is about to paste, query, or read clinical/patient data, or when an action (DB query, file read, tool output) may pull PHI into the conversation. Honors a [PHI-OK] attestation for synthetic / test data.

From the source SKILL.md

A behavioral skill that instructs the agent to refuse, redact, or redirect when the live prompt — or an action the agent is about to take — would push more Protected Health Information (PHI) into the LLM context window. Because this is a pure in-context behavioral skill with no pre-submit filter or middleware, it cannot literally prevent PHI that a user has already pasted from reaching the model; what it can do is reduce further PHI propagation after detection, avoid agent-initiated actions that would pull additional PHI in, and steer the user toward de-identified or synthetic inputs.

What this skill does

Phi Prompt Guard is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/phi-prompt-guard/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user is about to paste, query, or read clinical/patient data, or when an action (DB query, file read, tool output) may pull PHI into the conversation. Honors a [PHI-OK] attestation for synthetic / test data.

Who uses this skill

The Phi Prompt Guard Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 70,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/phi-prompt-guard
curl -L https://claudskills.com/skills/phi-prompt-guard/SKILL.md \
  -o ~/.claude/skills/phi-prompt-guard/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/phi-prompt-guard/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/phi-prompt-guard/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\phi-prompt-guard\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Attribution & license

Source: https://github.com/aipoch/medical-research-skills/blob/HEAD/scientific-skills/Other/phi-prompt-guard/SKILL.md
License: MIT
Author: AIPOCH
Website: https://aipoch.com/agent-skills

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

AIPOCH. (2026). Phi Prompt Guard [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/phi-prompt-guard/

BibTeX

@misc{phi-prompt-guard-2026,
  author    = {AIPOCH},
  title     = {Phi Prompt Guard [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/phi-prompt-guard/}
}

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