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MCP validate_vast Passes the XML the Agent Pasted. The Live Tag URL Still Has Wrappers.

This story is from 2026-10-02. It is preserved in the archive; the latest stories are on the live feed.

A buyer agent finishes an AdCP step, calls an MCP tool, and logs valid: true . Trafficking still fails on the player with VAST error 303 or an empty break. The XML in the tool call was fine. The URI on the manifest was not the same document. Two different inputs, one tool name The vastlint MCP serv…

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  1. 2026-10-02 00:54 · DEV Community — AI
    MCP validate_vast Passes the XML the Agent Pasted. The Live Tag URL Still Has Wrappers.

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