# Ev Certificate Validator

> Ev Certificate Validator is an Agent Skill for devops & security published in the a5c-ai/babysitter repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Validate EV code signing certificate chain and timestamp for Windows SmartScreen

- Skill name: `ev-certificate-validator`
- Category: [DevOps & Security](https://www.openparable.com/skill/devops-security/1)
- Source: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/desktop-development/skills/ev-certificate-validator/SKILL.md
- Repository: a5c-ai/babysitter (1,548 GitHub stars when collected)

## SKILL.md

# ev-certificate-validator

Validate EV (Extended Validation) code signing certificate chain and timestamp to ensure Windows SmartScreen compatibility.

## Capabilities

- Verify certificate chain validity
- Check timestamp presence and validity
- Validate EV certificate attributes
- Check certificate expiration
- Verify signature algorithm strength
- Validate publisher information

## Input Schema

```json
{
  "type": "object",
  "properties": {
    "signedFile": { "type": "string" },
    "checkSmartScreen": { "type": "boolean", "default": true }
  },
  "required": ["signedFile"]
}
```

## Validation Commands

```powershell
# Verify signature with chain
signtool verify /pa /all /v signed.exe

# Check certificate details
certutil -dump signed.exe

# Verify timestamp
signtool verify /pa /tw signed.exe
```

## Related Skills

- `windows-authenticode-signer`
- `code-signing-setup` process

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Source: https://www.openparable.com/skill/devops-security/ev-certificate-validator (OpenParable). Cite the canonical URL above.