# vastlint

> Use this tool when you need to validate IAB VAST ad tags for spec compliance, solving issues with incompatible or malformed tags that can disrupt ad serving. It checks XML files against VAST 2.0-4.3 standards, providing output on compliance errors. Input VAST XML files to ensure seamless ad delivery across platforms.

Canonical page: https://skillsregistry.net/skills/io-github-aleksuix-vastlint  
JSON: https://api.skillsregistry.net/v1/skills/io-github-aleksuix-vastlint

## Description

VAST XML validator — checks IAB VAST 2.0–4.3 ad tags for spec compliance. 118 rules.

## Trust

- **Trust score (0–1):** 0.45
- **Verification tier:** scanned
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 0.3.4
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-09-19

## Source

- **Source listing:** [MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/io.github.aleksUIX%2Fvastlint)
- **Repository:** <https://github.com/aleksUIX/vastlint>

## Use it

MCP endpoint published by the skill: `https://vastlint.org/mcp`

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "io-github-aleksuix-vastlint"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/io-github-aleksuix-vastlint` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/io-github-aleksuix-vastlint/pull`

---
SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt