feat(simulation): control arbitrary tool lifecycles (#37816)

packages/core/test/session-runner-tool-registry.test.ts

@@ -95,6 +95,21 @@ describe("ToolRegistry", () => {
     }),
   )
 
+  it.effect("validates a registration batch before installing any tools", () =>
+    Effect.gen(function* () {
+      const service = yield* ToolRegistry.Service
+      const error = yield* service
+        .registerBatch([
+          { tools: { first: make() }, options: { codemode: false } },
+          { tools: { second: make() }, options: { namespace: "invalid..namespace", codemode: false } },
+        ])
+        .pipe(Effect.flip)
+
+      expect(error).toBeInstanceOf(Tool.RegistrationError)
+      expect((yield* service.materialize()).definitions).toEqual([])
+    }),
+  )
+
   it.effect("filters disabled tools with edit aliases and ordered wildcard precedence", () =>
     Effect.gen(function* () {
       const service = yield* ToolRegistry.Service