Validate IAB VAST ad tags against 118 spec compliance rules covering VAST 2.0–4.3 standards. Built for developers integrating video ad infrastructure who need automated XML schema and business logic checks.
io.github.aleksUIX/vastlint
https://vastlint.org/mcp
SSE
No auth required
How models use it and what it is built for.
Validate IAB VAST ad tags against 118 spec compliance rules covering VAST 2.0–4.3 standards. Built for developers integrating video ad infrastructure who need automated XML schema and business logic checks.
Hosted endpoint — paste into any MCP client.
Where to find authoritative docs and source for vastlint.
Paste any of these into Agent Studio after connecting vastlint.
Common questions about connecting and running vastlint.
What VAST versions does this validator support?
Vastlint validates VAST 2.0 through 4.3 against 118 IAB specification rules. It checks both XML schema compliance and business logic requirements across all supported versions.
How do I connect this MCP server to my Claude session?
The server is available as a hosted SSE endpoint at https://vastlint.org/mcp or you can self-host using the Linux binary from the releases page. Configure your MCP client to connect to either endpoint.
What kind of validation errors does it catch?
Vastlint checks XML structure, required fields, data types, and IAB VAST business rules across 118 rules. It validates creative elements, tracking URLs, ad parameters, and other spec-defined constraints.
Can I run this locally or only as a hosted service?
You can run it locally using the self-hosted Linux binary (x86_64) or connect to the hosted endpoint at vastlint.org/mcp. Both options are available depending on your infrastructure needs.
What's the difference between VAST validation and just XML schema checking?
Vastlint goes beyond XML schema to enforce IAB VAST business rules—like valid tracking event types, required creative attributes, and version-specific constraints. This catches logical errors that schema validation alone would miss.
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