feat(core): Cleanup after migrating tools. (#6199)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/core/src/tools/tools.ts

@@ -7,6 +7,7 @@
 import { FunctionDeclaration, PartListUnion } from '@google/genai';
 import { ToolErrorType } from './tool-error.js';
 import { DiffUpdateResult } from '../ide/ideContext.js';
+import { SchemaValidator } from '../utils/schemaValidator.js';
 
 /**
  * Represents a validated and ready-to-execute tool call.
@@ -170,7 +171,7 @@ export abstract class DeclarativeTool<
    * @param params The raw parameters from the model.
    * @returns An error message string if invalid, null otherwise.
    */
-  protected validateToolParams(_params: TParams): string | null {
+  validateToolParams(_params: TParams): string | null {
     // Base implementation can be extended by subclasses.
     return null;
   }
@@ -278,6 +279,23 @@ export abstract class BaseDeclarativeTool<
     return this.createInvocation(params);
   }
 
+  override validateToolParams(params: TParams): string | null {
+    const errors = SchemaValidator.validate(
+      this.schema.parametersJsonSchema,
+      params,
+    );
+
+    if (errors) {
+      return errors;
+    }
+    return this.validateToolParamValues(params);
+  }
+
+  protected validateToolParamValues(_params: TParams): string | null {
+    // Base implementation can be extended by subclasses.
+    return null;
+  }
+
   protected abstract createInvocation(
     params: TParams,
   ): ToolInvocation<TParams, TResult>;