**1 issue found** across 8 files Confidence score: **2/5** - There is a high-confidence security risk in `packages/core/lib/v3/agent/tools/goto.ts`: raw `page.goto` errors can include resolved URLs after variable substitution, which may expose secret values in error messages. - Because this is a concrete, user-impacting secret-leak path (severity 8/10, confidence 8/10), merge risk is elevated even though only one issue was identified. - Pay close attention to `packages/core/lib/v3/agent/tools/goto.ts` - ensure exceptions are sanitized/redacted so resolved URL variables and secrets are not returned in error text.

Prompt for AI agents (unresolved issues)

```text Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately. P1: Custom agent: **Exception and error message sanitization** goto now substitutes variable values into URL, then returns raw page.goto error messages that can include the resolved URL and leak secret variable values. ```

Architecture diagram

```mermaid sequenceDiagram participant Agent as Agent / LLM participant Tool as gotoTool participant Vars as Variable Utility participant Page as Playwright/Page participant Cache as AgentCache Note over Agent, Cache: Live Execution Flow Agent->>Tool: execute({ url: "https://%env%/home" }) Tool->>Vars: NEW: substituteVariables(url, variables) Vars-->>Tool: "https://prod.com/home" Tool->>Page: CHANGED: goto("https://prod.com/home") Tool->>Cache: CHANGED: recordAgentReplayStep({ url: "https://%env%/home" }) Note right of Tool: Stores original template for portability Note over Agent, Cache: Replay Execution Flow (AgentCache) Cache->>Cache: Retrieve cached step alt step.type == "goto" Cache->>Vars: NEW: substituteVariables(step.url, variables) Vars-->>Cache: "https://prod.com/home" Cache->>Page: CHANGED: goto("https://prod.com/home") end Note over Agent, Page: V4 API Additions (Non-Agent) participant API as V4 Click API API->>Page: NEW: click(selector, { expectNavigation, expectPopup, expectDownload }) ```

_{Reply with feedback, questions, or to request a fix. Tag `@cubic-dev-ai` to re-run a review, or [fix all with cubic](https://www.cubic.dev/action/fix/pr/browserbase/stagehand/2054/ai_pr_review_1777190386387_5529c679-6fc1-4653-8bbf-152ff5fb3272?entrySource=github_ui_to_cubic_ui).}