privacy-check

privacy-check is a skill for Claude Code from haabe/mycelium. It costs 21 tokens per session (1,346 once invoked), scanned A, original, MIT.

A review of whether privacy protections are built into a feature or system from the beginning. It uses privacy principles such as collecting less data, clear communication, security, and user control.

In plain words
What is it for?
Use it to review data collection, sharing, security, deletion, access controls, and privacy settings.
Why use it?
It helps find privacy and data-protection problems before implementation is finished. It is intended to support alignment with the GDPR, the European Union’s data-protection law.

Skill for Claude Code

Written for Claude Code: Claude Code plugin machinery. Also seen: mentions CLAUDE.md.

Part of the mycelium plugin — 61 skills, 6 hooks shipped together

Good fit Use it to review data collection, sharing, security, deletion, access controls, and…

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/haabe/mycelium/privacy-check
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add haabe/mycelium --skill privacy-check
Clone the repo
git clone --depth 1 https://github.com/haabe/mycelium

Made for: Claude Code.

Or install mycelium, the plugin that ships this one along with the rest of its 61 skills, 6 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for privacy-check

README.md
[![agentmods](https://agentmods.dev/badge/skills/haabe/mycelium/privacy-check.svg)](https://agentmods.dev/skills/haabe/mycelium/privacy-check)
Your own site
<a href="https://agentmods.dev/skills/haabe/mycelium/privacy-check"><img src="https://agentmods.dev/badge/skills/haabe/mycelium/privacy-check.svg" alt="Measured on agentmods" height="20"></a>
Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,346 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00021 $0.01346
Opus 5 $0.00010 $0.00673
Sonnet 5 $0.00004 $0.00269
Haiku 4.5 $0.00002 $0.00135

Measured 3d ago against content hash 0387c608776f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

privacy-check scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/mycelium/skills/privacy-check/SKILL.md · 133 lines

How it starts

The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Privacy Check Skill

Privacy by Design assessment.

Workflow

7 Foundational Principles (Cavoukian)

  1. Proactive not Reactive: Are privacy measures built in from the start?

    • Privacy considered in design phase, not bolted on
    • Risks identified before implementation
  2. Privacy as Default: Is the most private option the default?

    • Data collection opt-in, not opt-out
    • Minimum data collected by default
    • Sharing disabled by default
  3. Privacy Embedded in Design: Is privacy integral to the system?

    • Privacy controls are core features, not add-ons
    • Architecture supports data minimization
  4. Positive-Sum, not Zero-Sum (originally "Full Functionality"): Privacy without trade-offs?

    • Privacy features don't degrade user experience
    • Not a false choice between privacy and functionality
    • Avoid false dichotomies: privacy vs. security, privacy vs. business value
  5. End-to-End Security: Data protected throughout its lifecycle?

    • Encryption at rest and in transit
    • Secure deletion when no longer needed
    • Access controls throughout the data lifecycle
  6. Visibility and Transparency: Is data processing transparent?

    • Users know what data is collected and why
    • Processing purposes documented and communicated
    • Third-party sharing disclosed
  7. Respect for User Privacy: Are user interests centered?

    • Users can access their data
    • Users can correct their data
    • Users can delete their data
    • Consent is informed, specific, and revocable

Data Protection Assessment

  • What data is collected? List all personal data fields.
  • Why? Lawful basis for each data element.
  • How long? Retention period for each data type.
  • Who accesses it? List all parties with access.
  • Where is it stored? Data residency and cross-border transfers.
  • How is it protected? Encryption, access control, monitoring.
  • What if breached? Incident response plan exists?

Read the full file on GitHub · 133 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago Changed · +40 lines 0387c608776f
  2. 7d ago First seen · 93 lines · 21 tokens per session scan A b2ff0b5f641f

Subscribe to this mod's changes

privacy-check is a skill published in the GitHub repository haabe/mycelium (45 stars, last pushed 2d ago), licensed MIT. It adds 21 tokens to every session and 1,346 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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