feat: SSE client example

Signed-off-by: John McBride <john@zuplo.com>

Author: jpmcb

examples/clients/sse/.gitignore

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+.env

examples/clients/sse/README.md

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+# MCP Client with SSE stream servers
+
+This example demonstrates how to use the MCP client to connect to and work with
+servers that server their content in `data: ` streams (i.e., SSE).
+This calls the GitHub MCP server `get_me` tool to demonstrate this.
+
+## Running the Example
+
+```bash
+npm install
+npm run build
+
+# Provide a GitHub token in the env for the Auth header
+# to the GitHub MCP server
+AUTH_TOKEN="ghp_..." npm start
+```
+
+## Supported env
+
+```env
+AUTH_TOKEN="ghp_..."
+```

examples/clients/sse/package-lock.json

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+{
+  "name": "@zuplo/mcp-example-tool-call-client",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/index.js",
+    "clean": "rm -rf ./dist/ && rm -rf ./node_modules/"
+  },
+  "dependencies": {
+    "@zuplo/mcp": "file:../../../"
+  }
+}

examples/clients/sse/package.json

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+import { MCPClient } from "@zuplo/mcp/client";
+import { ConsoleLogger } from "@zuplo/mcp/logger";
+import { HTTPClientTransport } from "@zuplo/mcp/transport/httpclient";
+
+const logger = new ConsoleLogger();
+const client = new MCPClient({
+  name: "GitHub SSE client",
+  version: "0.0.0",
+  logger,
+});
+
+const url = "https://api.githubcopilot.com/mcp/";
+const authToken = process.env.AUTH_TOKEN;
+
+if (authToken === "") {
+  throw Error("no AUTH_TOKEN env var provided. Please provide a GitHub PAT for use with the GitHub MCP server.")
+}
+
+try {
+  const transport = new HTTPClientTransport({
+    url,
+    logger,
+    headers: {
+      Authorization: `Bearer ${authToken}`,
+    },
+  });
+
+  await client.connect(transport);
+  const initResult = await client.initialize();
+
+  logger.info("Connected successfully!", {
+    serverInfo: initResult.serverInfo,
+    protocolVersion: initResult.protocolVersion,
+  });
+
+  const userResult = await client.callTool("get_me", {});
+  logger.info("GitHub user:", userResult);
+} catch (error) {
+  logger.error("Error running client example:", error);
+} finally {
+  await client.disconnect();
+}

examples/clients/sse/src/index.ts

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+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": [
+    "./src/**/*"
+  ],
+  "references": [
+    { "path": "../../../" }
+  ]
+}