MCP for Developers

Connect to STOA's MCP Gateway and call your first tool — from Claude.ai, Python, or TypeScript. No kubectl. No cluster. Just a URL and a token.

Hosted Cloud

This guide uses STOA's hosted gateway at mcp.gostoa.dev. Everything works out of the box — no infrastructure setup required.

Option A: Claude.ai (Fastest)

The fastest path. Claude handles authentication automatically via OAuth 2.1.

1. Add the MCP Server

In claude.ai: Settings → Integrations → Add MCP Server

Field	Value
URL	https://mcp.gostoa.dev/mcp/sse
Name	STOA Platform

Sign in with your STOA credentials when prompted.

2. Discover and Call Tools

Ask Claude:

"List the tools available in STOA, then call the echo tool with the message 'hello world'"

Claude discovers your tools via tools/list, calls tools/call, and returns the result. That's it.

---

Option B: Python

Use the MCP Python SDK or plain HTTP.

With httpx (No SDK)

import httpx

GATEWAY = "https://mcp.gostoa.dev"
TOKEN = "your-access-token"  # See "Get a Token" below

headers = {
    "Authorization": f"Bearer {TOKEN}",
    "Content-Type": "application/json",
}

# List tools
resp = httpx.post(f"{GATEWAY}/mcp/tools/list", headers=headers, json={})
tools = resp.json()["tools"]
for tool in tools:
    print(f"  {tool['name']}: {tool.get('description', '')}")

# Call a tool
resp = httpx.post(
    f"{GATEWAY}/mcp/tools/call",
    headers=headers,
    json={"name": "echo", "arguments": {"message": "hello from Python"}},
)
print(resp.json())

With the MCP SDK

from mcp import ClientSession
from mcp.client.sse import sse_client

async def main():
    async with sse_client("https://mcp.gostoa.dev/mcp/sse") as (read, write):
        async with ClientSession(read, write) as session:
            await session.initialize()

            # List tools
            tools = await session.list_tools()
            for tool in tools.tools:
                print(f"  {tool.name}: {tool.description}")

            # Call a tool
            result = await session.call_tool("echo", {"message": "hello"})
            print(result)

import asyncio
asyncio.run(main())

Install: pip install mcp httpx

---

Option C: TypeScript

With fetch (No SDK)

const GATEWAY = "https://mcp.gostoa.dev";
const TOKEN = "your-access-token"; // See "Get a Token" below

// List tools
const toolsResp = await fetch(`${GATEWAY}/mcp/tools/list`, {
  method: "POST",
  headers: {
    Authorization: `Bearer ${TOKEN}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({}),
});
const { tools } = await toolsResp.json();
console.log("Available tools:", tools.map((t: any) => t.name));

// Call a tool
const callResp = await fetch(`${GATEWAY}/mcp/tools/call`, {
  method: "POST",
  headers: {
    Authorization: `Bearer ${TOKEN}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    name: "echo",
    arguments: { message: "hello from TypeScript" },
  }),
});
console.log(await callResp.json());

With the MCP SDK

import { Client } from "@modelcontextprotocol/sdk/client/index.js";
import { SSEClientTransport } from "@modelcontextprotocol/sdk/client/sse.js";

const transport = new SSEClientTransport(
  new URL("https://mcp.gostoa.dev/mcp/sse")
);
const client = new Client(
  { name: "my-app", version: "1.0.0" },
  { capabilities: { tools: {} } }
);

await client.connect(transport);

// List tools
const { tools } = await client.listTools();
console.log("Tools:", tools.map((t) => t.name));

// Call a tool
const result = await client.callTool({
  name: "echo",
  arguments: { message: "hello" },
});
console.log(result);

await client.close();

Install: npm install @modelcontextprotocol/sdk

---

Get a Token

For Python/TypeScript (Option B and C), you need an OAuth access token.

Quick: Client Credentials

TOKEN=$(curl -s -X POST "https://auth.gostoa.dev/realms/stoa/protocol/openid-connect/token" \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "client_id=${CLIENT_ID}" \
  -d "client_secret=${CLIENT_SECRET}" \
  -d "grant_type=client_credentials" | jq -r '.access_token')

echo $TOKEN

Get your CLIENT_ID and CLIENT_SECRET from the Console under API Keys.

Quick: SaaS API Key

If you created a scoped API key in the Console (under API Keys), use it directly:

curl -s "https://mcp.gostoa.dev/mcp/tools/list" \
  -H "X-API-Key: stoa_saas_xxxx_your_key_here" | jq

No OAuth flow needed — the API key authenticates directly.

---

Claude Desktop Config

To use STOA from Claude Desktop (local app), add this to your claude_desktop_config.json:

{
  "mcpServers": {
    "stoa": {
      "url": "https://mcp.gostoa.dev/mcp/sse"
    }
  }
}

Config file location:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

Restart Claude Desktop after saving. You'll be prompted to authenticate on first use.

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What's Next

Goal	Guide
Register your own backend API	Quickstart
Build custom MCP tools with CRDs	MCP Tools Development
Understand MCP protocol internals	MCP Protocol Fiche
Self-host STOA on your infra	Hybrid Deployment
Full MCP API reference	MCP Gateway API

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Troubleshooting

Problem	Fix
401 Unauthorized	Token expired (5 min default). Re-run the token command
403 Forbidden	Your tenant doesn't have access to this tool. Check API key scopes
SSE connection drops	Network timeout. The gateway closes idle SSE connections after 5 min
"No tools found"	No APIs registered in your tenant. Register one in the Console
Claude says "MCP server unavailable"	Check URL ends with /mcp/sse. Disconnect and reconnect in Settings
Python ConnectionError	Verify httpx is installed and the URL is reachable: curl https://mcp.gostoa.dev/health