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+# AgentTool with MCP Demo (SSE Mode)
+
+This demo shows how `AgentTool` works with MCP (Model Context Protocol) toolsets using **SSE mode**.
+
+## SSE vs Stdio Mode
+
+This demo uses **SSE (Server-Sent Events) mode** where the MCP server runs as a separate HTTP server:
+
+- **Remote connection** - Connects to server via HTTP
+- **Separate process** - Server must be started manually
+- **Network communication** - Uses HTTP/SSE for messaging
+
+For the **stdio (subprocess) version**, see [mcp_in_agent_tool_stdio](../mcp_in_agent_tool_stdio/).
+
+## Setup
+
+**Start the MCP simple-tool server in SSE mode** (in a separate terminal):
+
+```bash
+# Run the server using uvx (no installation needed)
+# Port 3000 avoids conflict with adk web (which uses 8000)
+uvx --from 'git+https://github.com/modelcontextprotocol/python-sdk.git#subdirectory=examples/servers/simple-tool' \
+    mcp-simple-tool --transport sse --port 3000
+```
+
+The server should be accessible at `http://localhost:3000/sse`.
+
+## Running the Demo
+
+```bash
+adk web contributing/samples
+```
+
+Then select **mcp_in_agent_tool_remote** from the list and interact with the agent.
+
+## Try These Prompts
+
+This demo uses **Gemini 2.5 Flash** as the model. Try these prompts:
+
+1. **Check available tools:**
+
+   ```
+   What tools do you have access to?
+   ```
+
+1. **Fetch and summarize JSON Schema specification:**
+
+   ```
+   Use the mcp_helper to fetch https://json-schema.org/specification and summarize the key features of JSON Schema
+   ```
+
+## Architecture
+
+```
+main_agent (root_agent)
+  │
+  └── AgentTool wrapping:
+        │
+        └── mcp_helper (sub_agent)
+              │
+              └── McpToolset (SSE connection)
+                    │
+                    └── http://localhost:3000/sse
+                          │
+                          └── MCP simple-tool server
+                                │
+                                └── Website Fetcher Tool
+```
+
+## Related
+
+- **Issue:** [#1112 - Using agent as tool outside of adk web doesn't exit cleanly](https://github.com/google/adk-python/issues/1112)
+- **Related Issue:** [#929 - LiteLLM giving error with OpenAI models and Grafana's MCP server](https://github.com/google/adk-python/issues/929)
+- **Stdio Version:** [mcp_in_agent_tool_stdio](../mcp_in_agent_tool_stdio/) - Uses local subprocess connection