Gemini CLI Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory Prompt/preflight-security-audit
How to: Gemini CLI Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory preflight-security-audit
Add Assay A2A, MCP & x402 Pre-Flight Verifier & Observatory to Gemini CLI
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01
Open ~/.gemini/settings.json and merge this in. Keep any servers already there.
{
"mcpServers": {
"assay": {
"httpUrl": "https://assay.agentdiet.dev/mcp"
}
}
}-
02
Save the file and restart Gemini CLI.
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03
preflight-security-audit is surfaced in the client's prompt or command menu. Unlike a tool, you invoke it deliberately — Gemini CLI will not call it for you.
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04
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.
Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI 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.