[lldb] Document MCP support in LLDB

Author: JDevlieghere

lldb/docs/index.rst

@@ -135,6 +135,7 @@ interesting areas to contribute to lldb.
    use/ondemand
    use/aarch64-linux
    use/symbolfilejson
+   use/mcp
    use/troubleshooting
    use/links
    Man Page <man/lldb>

lldb/docs/use/mcp.md

@@ -0,0 +1,68 @@
+# Model Context Protocol (MCP)
+
+LLDB supports for the [Model Context Protocol][1] (MCP). This structured,
+machine-friendly protocol allows AI models to access and interact with external
+tools, such as the debugger. Using MCP, an AI agent can execute LLDB commands
+to control the debugger: set breakpoints, inspect memory, step through code.
+This can range from helping you run a specific command you can't immediately
+remember to a fully agent-driven debugging experiences
+
+## MCP Server
+
+To start the MCP server in LLDB, use the `protocol-server start` command.
+Specify `MCP` as the protocol and provide a URI to listen on. For example, to
+start listening for local TCP connections on port `59999`, use the following
+command:
+
+```
+(lldb) protocol-server start MCP listen://localhost:59999
+MCP server started with connection listeners: connection://[::1]:59999, connection://[127.0.0.1]:59999
+```
+
+The server will automatically stop when exiting LLDB, or it can be stopped
+explicitly with the `protocol-server stop` command.
+
+```
+(lldb) protocol-server stop MCP
+```
+
+## MCP Client
+
+MCP uses standard input/output (stdio) for communication between client and
+server. The exact configuration depends on the client, but most applications
+allow you to specify an MCP server as a binary and arguments. This means that
+you need to use something like `netcat` to connect to LLDB's MCP server and
+forward communication over stdio over the network connection.
+
+Configuration example for [Claude Code][2]:
+
+```
+{
+  "mcpServers": {
+    "tool": {
+      "command": "/usr/bin/nc",
+      "args": ["localhost", "59999"]
+    }
+  }
+}
+```
+
+Configuration example for [Visual Studio Code][3]:
+
+```
+{
+  "mcp": {
+    "servers": {
+      "lldb": {
+        "type": "stdio",
+        "command": "/usr/bin/nc",
+        "args": ["localhost", "59999"]
+      }
+    }
+  }
+}
+```
+
+[1]: https://modelcontextprotocol.io
+[2]: https://modelcontextprotocol.io/quickstart/user
+[3]: https://code.visualstudio.com/docs/copilot/chat/mcp-servers