io.github.aleksUIX/vastlint

vastlint

Validate VAST, VMAP, and DAAST ad tags against IAB specs. 246 rules, pure Rust core.

19 1.3k/wk 9 tools GitHub npm

No known CVEs

Apache-2.0 license

Actively maintained

Last commit 3d ago

Works with most clients

Transport: sse, stdio

9 tools · ~417 tok

Grade A · 0.2% of 200K ctx

MCPpedia last refreshed this data 1d ago

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io.github.aleksUIX/vastlint is an MCP server that validate VAST, VMAP, and DAAST ad tags against IAB specs. 246 rules, pure Rust core. Its tool list has not been published yet over sse and stdio, requires no API key, and scores 92/100 on MCPpedia's security, maintenance and efficiency rubric.

Developer Tools

Step 1

Install in your client

Config is the same across clients - only the file and path differ.

Supported in Claude Desktopsse, stdio · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "vastlint": {
      "command": "vastlint-mcp"
    }
  }
}

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[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-aleksuix-vastlint-aleksuix)](https://mcppedia.org/s/io-github-aleksuix-vastlint-aleksuix)

Read me

What io.github.aleksUIX/vastlint does

Validate VAST, VMAP, and DAAST ad tags against IAB specs. 246 rules, pure Rust core.

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked - your result helps other developers.

npx -y 'vastlint' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

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Scored, not listed

Why this score

Five weighted categories - click any category to see the underlying evidence.

Score breakdown

92/100across 5 weighted dimensions

How we score →

0255075100

−8

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked vastlint against OSV.dev.

Inventory

Tools (9)

Click any tool to inspect its schema.

~417 tokens total

Community

Reviews

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How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.aleksUIX/vastlint safe to use?: io.github.aleksUIX/vastlint has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under Apache-2.0.
How do I install io.github.aleksUIX/vastlint?: io.github.aleksUIX/vastlint supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can io.github.aleksUIX/vastlint do?: io.github.aleksUIX/vastlint provides 9 tools: Performance, Docker, Roadmap, Fuzzing, License and 4 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with io.github.aleksUIX/vastlint?: io.github.aleksUIX/vastlint is compatible with claude-desktop, cursor, claude-code. It uses sse and stdio transport.
Is io.github.aleksUIX/vastlint actively maintained?: io.github.aleksUIX/vastlint is actively maintained - last commit was 3 days ago. It has 19 GitHub stars.

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Community

Discussion

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Has anyone used this with Cursor?How do you handle auth?Any alternatives?

VASTlint

This repository contains the validation engine, CLI, bindings and gRPC reference server. Chrome and IDE extensions, MCP applications and frontend runtime packages are maintained separately in vastlint-tools.

Website & web validator: VAST tag validator Paste a VAST tag and get results in your browser, no install required.

A high-performance VAST XML validator built on a pure-Rust core. Checks ad tags against the IAB Tech Lab VAST specification so you don't have to read it. Over $30 billion in annual CTV and video ad spend flows through VAST XML, and malformed tags are one of the most common causes of lost impressions, broken tracking, and revenue discrepancies between platforms. There is no widely adopted open-source tool that validates VAST XML against the full IAB specification across all published versions.

The VASTlint tools repository ships a native MCP server, making VAST validation available as a callable tool from Claude, Cursor, the AAMP Buyer Agent SDK, or any MCP-compatible client. Connect to vastlint.org/mcp and call validate_vast, validate_vast_url, inspect_vast, list_rules, explain_rule, or fix_vast. Each tool returns structured JSON with rule IDs, XPath locations, and spec references.

Bindings for realtime ad pipelines: vastlint-go (embedded WebAssembly by default, optional native cgo engine), vastlint-java (gRPC client for JVM ad servers), vastlint-erlang (Elixir/Erlang DirtyCpu NIF), and a WASM npm package for Node.js and browsers. All bindings use the same Rust validation core. The CLI daemon also supports OTP port integrations.

Need a copy-paste frontend starting point? See the React drop-in example in the tools examples.

Validates VAST documents against:

Frequently Asked Questions

Is io.github.aleksUIX/vastlint safe to use?

io.github.aleksUIX/vastlint has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under Apache-2.0.

How do I install io.github.aleksUIX/vastlint?

io.github.aleksUIX/vastlint supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can io.github.aleksUIX/vastlint do?

io.github.aleksUIX/vastlint provides 9 tools: Performance, Docker, Roadmap, Fuzzing, License and 4 more. See the full tools list on the server page for descriptions and parameters.

What AI clients work with io.github.aleksUIX/vastlint?

io.github.aleksUIX/vastlint is compatible with claude-desktop, cursor, claude-code. It uses sse and stdio transport.

Is io.github.aleksUIX/vastlint actively maintained?

io.github.aleksUIX/vastlint is actively maintained - last commit was 3 days ago. It has 19 GitHub stars.

VASTlint

Created by Aleksander Sekowski.

Website & web validator: VAST tag validator Paste a VAST tag and get results in your browser, no install required.

Need a copy-paste frontend starting point? See the React drop-in example in the tools examples.

Validates VAST documents against:

IAB Tech Lab VAST 2.0, 3.0, 4.0, 4.1, 4

... View full README on GitHub