diff --git a/extensions/canvas/src/tool-schema.ts b/extensions/canvas/src/tool-schema.ts
index caacc7ab3675..c0317f571d7c 100644
--- a/extensions/canvas/src/tool-schema.ts
+++ b/extensions/canvas/src/tool-schema.ts
@@ -3,7 +3,6 @@
  */
 import {
   optionalFiniteNumberSchema,
-  optionalNonNegativeIntegerSchema,
   optionalPositiveIntegerSchema,
   stringEnum,
 } from "openclaw/plugin-sdk/channel-actions";
@@ -40,7 +39,6 @@ export const CanvasToolSchema = Type.Object({
   outputFormat: Type.Optional(stringEnum(CANVAS_SNAPSHOT_FORMATS)),
   maxWidth: optionalPositiveIntegerSchema(),
   quality: optionalFiniteNumberSchema({ minimum: 0, maximum: 1 }),
-  delayMs: optionalNonNegativeIntegerSchema(),
   jsonl: Type.Optional(Type.String()),
   jsonlPath: Type.Optional(Type.String()),
 });
diff --git a/extensions/canvas/src/tool.test.ts b/extensions/canvas/src/tool.test.ts
index 841f1f46fc40..90d653f7d6b6 100644
--- a/extensions/canvas/src/tool.test.ts
+++ b/extensions/canvas/src/tool.test.ts
@@ -377,4 +377,18 @@ describe("Canvas tool", () => {
     );
     expect(mocks.imageResultFromFile).not.toHaveBeenCalled();
   });
+
+  it("advertises only snapshot controls supported by Canvas nodes", () => {
+    const schema = createCanvasTool().parameters as {
+      properties?: Record<string, unknown>;
+    };
+
+    expect(schema.properties?.outputFormat).toMatchObject({
+      type: "string",
+      enum: ["png", "jpg", "jpeg"],
+    });
+    expect(schema.properties?.maxWidth).toMatchObject({ type: "integer", minimum: 1 });
+    expect(schema.properties?.quality).toMatchObject({ type: "number", minimum: 0, maximum: 1 });
+    expect(schema.properties).not.toHaveProperty("delayMs");
+  });
 });