@@ -166,6 +166,13 @@ it.effect("does not let an older response replace a newer explicit tab target",
         .pipe(Effect.forkScoped);
       yield* Fiber.join(newer);
       yield* Fiber.join(older);
+      yield* broker.invoke({
+        scope,
+        operation: "status",
+        input: {},
+        tabId: olderTabId,
+        updateCurrentTab: false,
+      });
       yield* broker.invoke({ scope, operation: "snapshot", input: {} });
 
       expect(routedRequests.at(-1)?.tabId).toBe(newerTabId);
 
@@ -44,6 +44,8 @@ export interface PreviewAutomationInvokeInput {
   readonly input: unknown;
   readonly tabId?: PreviewTabId;
   readonly timeoutMs?: number;
+  /** Background metadata reads must not change the agent's current tab. */
+  readonly updateCurrentTab?: boolean;
 }
 
 export class PreviewAutomationBroker extends Context.Service<
@@ -575,6 +577,7 @@ export const make = Effect.gen(function* PreviewAutomationBrokerMake() {
       });
     });
     const result = yield* awaitResponse().pipe(Effect.ensuring(removePending));
+    if (input.updateCurrentTab === false) return result;
     const responseTabId = readResultTabId(result);
     const resultTabId = responseTabId === undefined ? input.tabId : responseTabId;
     if (resultTabId === undefined) return result;
 
@@ -80,6 +80,7 @@ const invoke = Effect.fn("PreviewToolkit.invoke")(function* <A>(
       operation: "status",
       input: {},
       timeoutMs: 500,
+      updateCurrentTab: false,
       ...(statusTabId === undefined ? {} : { tabId: statusTabId }),
     })
     .pipe(Effect.catch(() => Effect.succeed(null)));
 
@@ -264,7 +264,12 @@ describe("projectActivityPayload", () => {
     { tool: "t3-code_preview_status", state: { output: '{"url":"https://example.com/"}' } },
     {
       toolName: "mcp__t3_code__preview_snapshot",
-      result: { content: [{ type: "text", text: '{"url":"https://example.com/"}' }] },
+      result: {
+        content: [
+          { type: "text", text: '{"url":"https://example.com/"}' },
+          { type: "text", text: "Snapshot text was bounded. Omitted: accessibilityTree." },
+        ],
+      },
     },
     {
       toolName: "mcp__t3-code__preview_click",
 
@@ -4,6 +4,7 @@ import type {
   OrchestrationThreadDetailSnapshot,
 } from "@t3tools/contracts";
 import { isWorkspaceImagePreviewPath } from "@t3tools/shared/filePreview";
+import { extractJsonObject } from "@t3tools/shared/schemaJson";
 
 function asRecord(value: unknown): Record<string, unknown> | null {
   return value !== null && typeof value === "object" && !Array.isArray(value)
@@ -269,7 +270,7 @@ function projectPreviewToolMetadata(data: Record<string, unknown>, status: unkno
     const text = extractMcpResultText(result);
     if (!text || text.length > 2 * 1024 * 1024) return {};
     try {
-      page = asRecord(JSON.parse(text));
+      page = asRecord(JSON.parse(extractJsonObject(text)));
     } catch {
       return {};
     }
Original file line number	Diff line number	Diff line change
`@@ -264,7 +264,12 @@ describe("projectActivityPayload", () => {`
`264`	`264`	`{ tool: "t3-code_preview_status", state: { output: '{"url":"https://example.com/"}' } },`
`265`	`265`	`{`
`266`	`266`	`toolName: "mcp__t3_code__preview_snapshot",`
`267`		`- result: { content: [{ type: "text", text: '{"url":"https://example.com/"}' }] },`
	`267`	`+ result: {`
	`268`	`+ content: [`
	`269`	`+ { type: "text", text: '{"url":"https://example.com/"}' },`
	`270`	`+ { type: "text", text: "Snapshot text was bounded. Omitted: accessibilityTree." },`
	`271`	`+ ],`
	`272`	`+ },`
`268`	`273`	`},`
`269`	`274`	`{`
`270`	`275`	`toolName: "mcp__t3-code__preview_click",`