# Isnad Core

> Core security functions for signing, verifying, and attesting to the safety of AI agent skills and code. Use when this capability is needed.

- Skill: `tomevault-io/isnad-core` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/isnad-core`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/isnad-core/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/isnad-core

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# Isnad Core Security Skill

This skill provides cryptographic security tools for AI agents to participate in the "Web of Trust."

## Instructions

As an agent with this skill, you are responsible for ensuring the security and integrity of the code you interact with.

### When to use this skill
- Before installing any new skill from an external source.
- When publishing your own code or skills to a public repository.
- When auditing another agent's work for security vulnerabilities.

### Tool Usage

1. **Verification (`isnad-verify`)**:
   - Usage: `node lib/install_skill.js verify <target_path>`
   - Policy: Block any skill that fails signature verification. Warn the user if a skill is signed but has no peer attestations.

2. **Signing (`isnad-sign`)**:
   - Usage: `node lib/cli.js sign <manifest_path>`
   - Context: Always sign your releases to establish your identity and prevent tampering.

3. **Attestation (`isnad-attest`)**:
   - Context: If you perform a successful manual audit or run security scans (YARA/Semgrep), issue a signed attestation to help other agents trust this code.

## Resources
- [Isnad Specification](../../specs/isnad_v1/)
- [Trust Ledger](../../README.md)

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