Nessgate

The open, neutral compatibility resolver for the agentic web. Give NessGate a domain and it reads whatever that domain already publishes — across ARD (all three surfaces), A2A, llms.txt, RFC 9727 api-catalog, Open Resource Discovery, RFC 6415 host-meta, OpenAPI, Agent Network Protocol (ANP), Universal Commerce Protocol (UCP), AID, GB/Z 185.4 and more — and returns one normalized answer, with a link back to each source so an agent can always verify against the domain itself.

company.com  →  { resources: [
                   { source: "ard-catalog", type: "application/json",
                     url:       "https://company.com/ai-info.json",
                     sourceUrl: "https://company.com/.well-known/ard.json" },
                   ... ] }

One call instead of ten. NessGate reads these standards; it does not define or replace them — a new standard is just a new adapter, never a competitor. It reuses each source's own type labels and invents no taxonomy of its own. The domain is always the authority; NessGate only normalizes what the domain already publishes, reads it on demand, and stores nothing.

Live at https://nessgate.com · Specification · Charter · API

Use it

Embeddable library — dependency-free, fetches the target domain directly (no runtime dependency on nessgate.com), runs anywhere with fetch — Node, Deno, Workers, and agent runtimes. (It runs in a browser too, but a browser can only read other domains that send CORS headers, and most .well-known files don't — so from a browser, resolve arbitrary domains via the hosted endpoint below, which sends open CORS.) Published as @nessgate/resolver:

import { resolve } from "@nessgate/resolver";      // or "https://nessgate.com/resolver.mjs"
const { resources } = await resolve("example.com");

Hosted endpoint — open CORS, no auth:

curl https://nessgate.com/discover/example.com

MCP — the same lookup as a tool (discover_domain) at https://nessgate.com/mcp. Listed in the official MCP Registry as com.nessgate/nessgate (domain-verified remote server), so MCP-aware clients can install it directly.

Integrate it (≈5 lines)

Give an agent a domain, get back what to use — no per-standard code. Drop this into a tool, a retrieval step, or an onboarding flow:

import { resolve } from "@nessgate/resolver";           // dependency-free, no key, no account
const { resources } = await resolve(domain);            // reads the domain directly
for (const r of resources)
  console.log(r.type, r.url, "←", r.sourceUrl);         // normalized record + where it came from
// each r: { source, type, url, sourceUrl } — pick the one your agent needs (OpenAPI, A2A, MCP, …)

No SDK? The hosted endpoint is one HTTP GET (GET https://nessgate.com/discover/{domain}, open CORS, no auth), and the MCP tool discover_domain returns the same shape. Adding a new standard is a new adapter upstream — integrations don't change.

Full integration guide — library, HTTP, and MCP client config (including the mcp-remote bridge for stdio-only clients): docs/integrations.md.

Principles