Agent Nexus

Registry of 180+ continuously tested APIs, MCP servers and CLIs that AI agents can call, with endpoint, auth, limits and reliability score.

CommunityOnlineNo sign-inGlobalFreeRead-only

What it can do

  • Discover Capabilities: Match a natural-language need (e.g. 'send a transactional email', 'query Postgres') to the interfaces that can do it, ranked by capability match and verified reliability. Return
  • Search Registry: Search the Agent Nexus registry of approved APIs, MCP servers and CLIs by keyword and optional category.
  • Get Entry: Fetch one approved Agent Nexus registry entry by slug, including its endpoint, auth method and last health probe.

What data it sees

Do you need an account

No: the server works without sign-in

Registry of 180+ continuously tested APIs, MCP servers and CLIs that AI agents can call, with endpoint, auth, limits and reliability score.

How to connect

How to connect Agent Nexus to Claude

The server address to paste into Claude settings:

https://agentnexus--ceo-2z03.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Agent Nexus to ChatGPT

The server address to paste into ChatGPT settings:

https://agentnexus--ceo-2z03.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Agent Nexus to Cursor

The server address to paste into Cursor settings:

https://agentnexus--ceo-2z03.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (5)

Raw names from tools/list. Only developers need these.

discover_capabilitiesMatch a natural-language need (e.g. 'send a transactional email', 'query Postgres') to the interfaces that can do it, ranked by capability match and verified reliability. Returns everything needed to call them: endpoint, auth mode, auth parameters, formats, rate limit and cost. Always returns a payload: when nothing matches, `coverage` is 'none', `uncovered` is true and the entries returned are reliable starting points, not matches.
search_registrySearch the Agent Nexus registry of approved APIs, MCP servers and CLIs by keyword and optional category.
get_entryFetch one approved Agent Nexus registry entry by slug, including its endpoint, auth method and last health probe.
list_categoriesList the three interface layers Agent Nexus indexes (APIs, MCPs, CLIs) with the number of approved entries in each.
list_entriesList every approved entry in the Agent Nexus registry, page by page. Returns up to 50 entries per page, ordered by slug, with the total count so you can page through the whole catalogue. Use search_registry for keyword lookup instead.