Claude Code Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory Prompt/verify-x402-delivery
How to: Claude Code Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory verify-x402-delivery
Add Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory to Claude Code
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Run this in your project directory.
claude mcp add --transport http assay https://assay.agentdiet.dev/mcp-
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Restart your session so the server is picked up.
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verify-x402-delivery is surfaced as a slash command — type / and it is in the list. Unlike a tool, you invoke it deliberately — Claude Code will not call it for you.
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If it does not appear, check that Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory is connected and that you are looking at its prompts rather than its tools.
Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs
Same prompt, other clients
Read from the server itself, by connecting to it and calling prompts/list on 19 October 2026.
A listing does not declare its prompts, so asking is the only way to know them, and this
is what the server actually offers rather than what its listing claims. Names only are
stored; connect the server for each prompt's arguments.