Initial project import

tools/v/vlib/x/async/tests/mcp/README.md

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+# mcp integration tests
+
+These tests keep MCP traffic in memory. They do not start stdio, HTTP, a child
+process, or any external MCP service.
+
+The coverage target is the `x.async` boundary around MCP-shaped work:
+
+- build an MCP request;
+- decode and validate it inside a `Task`;
+- produce an MCP response;
+- decode the result after `Task.wait()`.

tools/v/vlib/x/async/tests/mcp/mcp_integration_test.v

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+import context
+import mcp
+import x.async as xasync
+
+struct TestEchoArgs {
+pub:
+	text string
+}
+
+fn test_mcp_task_dispatches_in_memory_request() {
+	request := mcp.new_request(1, 'tools/call', TestEchoArgs{
+		text: 'hello'
+	})
+	mut task := xasync.run[mcp.Response](fn [request] (mut ctx context.Context) !mcp.Response {
+		_ = ctx
+		req := mcp.decode_request(request.encode())!
+		if req.method != 'tools/call' {
+			return error('unexpected MCP method')
+		}
+		args := req.decode_params[TestEchoArgs]()!
+		result := mcp.tool_text_result(args.text)
+		return mcp.new_response(1, result, mcp.ResponseError{})
+	})!
+
+	response := task.wait()!
+	result := response.decode_result[mcp.ToolResult]()!
+	assert result.content.contains('hello')
+}