> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pinkfish.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Application Servers

> External integration MCP servers — connect third-party services with a PCID

**Type:** Application (proxy) | **PCID required:** Yes

Application servers are proxies to external products and APIs. Each one exposes a vendor or product integration as MCP tools. You create a connection in Pinkfish, obtain a **PCID** (PinkConnect connection ID), then call tools on the matching server path.

Coverage spans many categories (collaboration, CRM, cloud suites, data platforms, support, commerce, and more). **This page stays high level** — it does not list individual integrations.

## How application servers work

1. **Connect** — Set up a connection in the Pinkfish dashboard to get a PCID
2. **Discover** — Call `tools/list` on the server path, or use [`capabilities_discover`](/api-reference/mcp-servers/embedded/pinkfish-sidekick#capabilities_discover) and [`capability_details`](/api-reference/mcp-servers/embedded/pinkfish-sidekick#capability_details) on the workflow building server
3. **Call** — Invoke tools with the standard JSON-RPC 2.0 pattern, passing the PCID in the tool arguments

For PCIDs and connection setup, see the [Connections guide](/api-reference/platform/connections).

## Generic call pattern

Replace `<server-path>`, `<PCID>`, and `<tool_name>` with your values:

```bash theme={null}
curl -s -X POST "https://mcp.pinkfish.ai/<server-path>" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <API_KEY>" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "<tool_name>",
      "arguments": {
        "PCID": "<your-pcid>",
        ...
      }
    }
  }'
```

## Discovering tools at runtime

Tool schemas are provided by the proxy and may change when integrations update. Prefer **runtime discovery** over assuming static docs are exhaustive:

```bash theme={null}
curl -s -X POST "https://mcp.pinkfish.ai/<server-path>" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <API_KEY>" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/list",
    "params": {}
  }'
```

You can also resolve tool names and shapes through **`capability_details`** on `/pinkfish-sidekick`, passing the tool names you care about.

## Where to find each server

* **Sidebar** — Under **Application MCP Servers**, each entry is a dedicated page with path, tools, and parameters (including products where one parent page groups multiple related child server paths).
* **Runtime discovery** — `tools/list` on a server path shows the live MCP surface available to your environment, including the current tool names and schemas.

For built-in platform capabilities (no PCID), see [Embedded MCP servers](/api-reference/mcp-servers/embedded/overview).