Open-source plugin that redacts PII before Claude Code reads it. Names, emails, and IBANs become placeholders Claude sees; you reveal originals locally. Same engine ships as a CLI for any LLM and a hosted proxy for OpenAI/Anthropic/Azure.
Hey — I built noirdoc because I kept seeing the same pattern on consulting engagements: a team wants to use Claude on a real customer ticket, and Legal kills it because the prompt would leak names, IBANs, and addresses to a third party.
The plugin is a PreToolUse hook for Claude Code. When Claude tries to read a file from a path you mark sensitive, the plugin redacts it first — names become `<>`, IBANs become `<>` — Claude works on the placeholders, and you reveal the originals locally in your own terminal. Real names never enter Claude's transcript.
Detection runs locally — Presidio + Flair + GLiNER ensemble, German-tuned (it handles "Müller, Anna" and lowercase legal text where most tools fail). Reversible, with consistent placeholders across sessions.
Same engine ships three ways: this plugin (OSS), a CLI on PyPI for any LLM workflow (OSS), and a hosted proxy that does the same thing transparently for OpenAI / Anthropic / Azure calls if your team needs that.
Curious what you'd want it to redact next — what's the data you can't paste into an LLM today?
This solves a real pain point. I work at a fintech and we hit the same wall constantly: engineers want to use Claude Code on production support tickets but the moment there's a customer IBAN or address in the file, compliance shuts it down. The PreToolUse hook approach is smart because it catches things before they ever leave your machine. Curious about the performance overhead on large files (e.g. 10K+ line logs with scattered PII). Does the Presidio+Flair ensemble add noticeable latency, or is it fast enough to feel invisible during normal Claude Code usage?
voice→form widgets are the case i kept hitting — transcribed names, addresses, phone numbers flowing straight into prompts before anyone notices. the moment you try to use real customer voice samples, Legal blocks the whole pipeline.
the German-tuned detection is the part that actually matters — most tools fail on lowercase legal text and "Müller, Anna" patterns, and false positives there kill adoption faster than missed PII.
apart from finance information is it able to detect some credentials been passed accidentaly?
About noirdoc on Product Hunt
“PII guard for Claude Code to keep client data out of context”
noirdoc launched on Product Hunt on April 29th, 2026 and earned 80 upvotes and 5 comments, placing #15 on the daily leaderboard. Open-source plugin that redacts PII before Claude Code reads it. Names, emails, and IBANs become placeholders Claude sees; you reveal originals locally. Same engine ships as a CLI for any LLM and a hosted proxy for OpenAI/Anthropic/Azure.
noirdoc was featured in Open Source (68.3k followers), Privacy (11.1k followers), Developer Tools (511.6k followers) and GitHub (41.2k followers) on Product Hunt. Together, these topics include over 104.1k products, making this a competitive space to launch in.
Who hunted noirdoc?
noirdoc was hunted by Antonio Maiolo. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Antonio Maiolo