ProofAgent for Claude is a free, open-source plugin for the Claude desktop app and Claude Code. Names, emails, phone numbers, IDs, card numbers, health data and secrets are masked before Claude sees them, the real values come back on your machine, and prompt injection, jailbreaks and data leaving are flagged as they happen. Works in English, French and Arabic.
11 everyday safety skills
Scam Radar: is this message, DM, email or link a scam?
Safe to Share: strip private details before sending.
Privacy X-Ray: list every sensitive detail in a document.
Safety Score: what ProofAgent protected you from.
Family Shield: grooming and scam signals in messages to kids.
Post Guard: check a caption or photo before posting.
Deal Check: spot fake brand deals.
Invoice Shield: fake invoices and changed bank details.
Pay Pause: a safety stop before payments.
Patient Privacy: de-identify health notes.
Client Cloak: anonymise client documents.
Install
In the Claude desktop app: Settings, Customize, Plugins, Add, then paste ProofAgent-ai/proofagent-claude-plugin and install ProofAgent. In Claude Code: /plugin marketplace add ProofAgent-ai/proofagent-claude-plugin, then /plugin install proofagent@proofagent. Free to start with 1,000 calls a month; open source under Apache 2.0.