Initial library commit

src/main/java/mcp/tools/DefaultMcpTool.java

@@ -0,0 +1,20 @@
+package mcp.tools;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation to mark an {@link McpTool} for automatic discovery and registration.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface DefaultMcpTool {
+    /**
+     * Whether this tool is enabled for automatic registration.
+     *
+     * @return true if enabled, false otherwise.
+     */
+    boolean enabled() default true;
+}

src/main/java/mcp/tools/McpTool.java

@@ -0,0 +1,18 @@
+package mcp.tools;
+
+import io.modelcontextprotocol.spec.McpSchema;
+
+import java.util.Map;
+
+/**
+ * Interface for implementing MCP tools.
+ * <p>
+ * Implementations must have a public no-args constructor if they are to be
+ * discovered automatically via {@link DefaultMcpTool}.
+ */
+public interface McpTool {
+    String name();
+    String description();
+    String schema();
+    McpSchema.CallToolResult call(McpSchema.CallToolRequest request, Map<String, Object> arguments);
+}