diff --git a/src/tools/index.ts b/src/tools/index.ts
new file mode 100644
index 0000000..313d03d
--- /dev/null
+++ b/src/tools/index.ts
@@ -0,0 +1,52 @@
+/**
+ * Model Context Protocol (MCP) Tools Registry and Barrel Export.
+ */
+
+import type { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { registerTool, type ToolDefinition } from "./common";
+import { projectTools } from "./projects";
+import { workPackageTools } from "./work-packages";
+import { queryTools } from "./queries";
+import { metadataTools } from "./metadata";
+
+export * from "./common";
+export * from "./projects";
+export * from "./work-packages";
+export * from "./queries";
+export * from "./metadata";
+
+export type AnyToolDefinition =
+  | (typeof projectTools)[number]
+  | (typeof workPackageTools)[number]
+  | (typeof queryTools)[number]
+  | (typeof metadataTools)[number];
+
+export const allTools: AnyToolDefinition[] = [
+  ...projectTools,
+  ...workPackageTools,
+  ...queryTools,
+  ...metadataTools,
+];
+
+export interface RegisterToolsOptions {
+  readOnly?: boolean;
+}
+
+/**
+ * Registers all OpenProject tools with the given McpServer instance.
+ * If options.readOnly is true, tools not marked as readOnly are skipped.
+ */
+export function registerAllTools(
+  server: McpServer,
+  options?: RegisterToolsOptions
+): void {
+  const isReadOnly = options?.readOnly ?? false;
+
+  for (const tool of allTools) {
+    // If server is in read-only mode, skip any non-read-only tools
+    if (isReadOnly && !tool.readOnly) {
+      continue;
+    }
+    registerTool(server, tool);
+  }
+}
diff --git a/tests/tools.test.ts b/tests/tools.test.ts
index db4dcdb..1c6af3f 100644
--- a/tests/tools.test.ts
+++ b/tests/tools.test.ts
@@ -1,4 +1,10 @@
 import { describe, expect, test } from "bun:test";
+import {
+  allTools,
+  registerAllTools,
+  type RegisterToolsOptions,
+  type AnyToolDefinition,
+} from "../src/tools/index";
 import {
   formatToolSuccess,
   formatToolError,
@@ -929,5 +935,59 @@ describe("Metadata Tools", () => {
   });
 });
 
+describe("Tool Registry", () => {
+  test("allTools contains exactly 10 Phase 1 tools", () => {
+    expect(allTools).toHaveLength(10);
+    const names = allTools.map((t) => t.name);
+    expect(names).toEqual([
+      "openproject_list_projects",
+      "openproject_get_project",
+      "openproject_list_work_packages",
+      "openproject_get_work_package",
+      "openproject_list_queries",
+      "openproject_get_query",
+      "openproject_list_types",
+      "openproject_list_statuses",
+      "openproject_list_priorities",
+      "openproject_list_users",
+    ]);
+  });
+
+  test("all tools in Phase 1 are marked readOnly: true", () => {
+    for (const tool of allTools) {
+      expect(tool.readOnly).toBe(true);
+    }
+  });
+
+  test("registerAllTools registers all 10 tools on McpServer", () => {
+    const server = new McpServer({ name: "test-mcp", version: "1.0.0" });
+    registerAllTools(server);
+
+    const registeredTools = (
+      server as unknown as {
+        _registeredTools: Record<string, unknown>;
+      }
+    )._registeredTools;
+
+    expect(Object.keys(registeredTools)).toHaveLength(10);
+    for (const tool of allTools) {
+      expect(registeredTools[tool.name]).toBeDefined();
+    }
+  });
+
+  test("registerAllTools filters out non-readOnly tools when readOnly is true", () => {
+    const server = new McpServer({ name: "test-mcp", version: "1.0.0" });
+    registerAllTools(server, { readOnly: true });
+
+    const registeredTools = (
+      server as unknown as {
+        _registeredTools: Record<string, unknown>;
+      }
+    )._registeredTools;
+
+    expect(Object.keys(registeredTools)).toHaveLength(10);
+  });
+});
+