diff --git a/src/agent/Agent.zig b/src/agent/Agent.zig
index 85475e34..00dd12e8 100644
--- a/src/agent/Agent.zig
+++ b/src/agent/Agent.zig
@@ -64,6 +64,12 @@ const default_system_prompt = script.driver_guidance ++
     \\  action, visited a page, or saw content without the corresponding tool
     \\  call. If a task needs a capability Lightpanda lacks (images, PDFs,
     \\  audio), say so rather than improvising.
+    \\- Verify before answering: when a task asks for a specific value, ranked
+    \\  list, or comparison, and your first source is ambiguous, incomplete,
+    \\  or the answer is non-obvious, cross-check on ONE more authoritative
+    \\  source before committing. For multi-candidate questions (yes/no,
+    \\  A/B/C, pick-N), commit to a choice — don't abstain when you have data
+    \\  to reason from.
     \\- If the user asks for account-scoped data (karma, profile, inbox, …)
     \\  and the page shows you're not signed in, log in proactively (per
     \\  the Credentials section above) before reporting unavailable.