Security, Privacy & Compliance
PromptSign.ai
Code signing for AI skills and agents
A cryptographic signing tool that verifies the origin and integrity of AI skills, agents, and instruction files like CLAUDE.md and AGENTS.md.
Overview
A look at promptsign.ai
PromptSign.ai is a PKI (public key infrastructure) system for AI instruction files that signs and verifies AI skills, agents, and configuration files. It provides cryptographic proof of who published a skill and confirms that no byte has changed since signing.
The tool offers four core guarantees: origin authentication showing exactly who published something under a verified identity, integrity verification that nothing has changed, accountability through a public transparency log, and revocability to stop trusting compromised keys or bad actors. It does not prove harmlessness, only provenance.
PromptSign works by taking a SHA-256 hash fingerprint of every file, signing those fingerprints under a verified identity (such as GitHub, Google, or Microsoft accounts), and shipping the signature in a .promptsign/bundle.json file with the skill. Verification can happen offline without any server connection.
Feature notes
- Sign skills and agents with verified identity authentication
- Verify file integrity using SHA-256 fingerprints
- Offline verification without internet connection
- Public transparency log for accountability
- Revoke trust for compromised keys or bad actors
- Support GitHub, Google, Microsoft and company account authentication
- Command-line tool for integration with Claude and Codex hooks
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FAQ
- What does a signature prove?
- A signature proves who published a skill and that the content has not changed. It does not prove that the content is safe or harmless.
- Can I verify signatures offline?
- Yes, verification can happen completely offline. PromptSign re-fingerprints every file and confirms the signature without requiring any server or internet connection.
- What authentication methods are supported?
- PromptSign supports authentication with GitHub, Google, Microsoft, and company accounts to verify the identity of the publisher.
- Is a command-line tool required to use PromptSign?
- No, installing the command-line tool is optional. Browser-based tools provide the same signing and verification functionality, and no file content leaves your computer when using the in-browser tools.
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