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Probe V0

Official registry Security

Experimental MCP server for current empirical verification of explicit public HTTPS endpoint claims.

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http probe-v0 'https://probe-evidence.probe-lab.workers.dev/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "probe-v0": {
            "type": "http",
            "url": "https://probe-evidence.probe-lab.workers.dev/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Probe (experimental V0)

Probe lets AI agents empirically verify current claims about public HTTPS endpoints by making a bounded direct observation. This differs from web search or documentation, which report what sources say, and from model inference, which is not a live observation.

Probe persists timestamped, freshness-aware evidence so a sufficiently recent matching observation can be reused and historical observations can be compared.

V0 is intentionally narrow: public HTTPS hostname URLs on port 443; GET or HEAD; HTTP status, exact header, exact JSON Pointer value, or literal body-substring assertions. Public V0 requires freshness_seconds exactly 300.

Redirect following is opt-in with follow_redirects=true, limited to three 301/302/303/307/308 hops. Every destination must satisfy the same HTTPS, hostname, port, credential, query, fragment, and private/local safety restrictions. With the default false, Probe observes only the first response. Probe must not be used when the user's actual claim requires fetching an unsupported destination.

Probe does not provide a complete DNS-rebinding guarantee, uptime guarantee, SLA, authentication feature, or pricing commitment. It is experimental V0.

Frequently asked questions

What is Probe V0?

Experimental MCP server for current empirical verification of explicit public HTTPS endpoint claims.

How do I install Probe V0?

It runs as a remote server. In Claude Code: claude mcp add --transport http probe-v0 'https://probe-evidence.probe-lab.workers.dev/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Probe V0 need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Probe V0 open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Probe V0?

It is published by lexbritten. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.