Name the setting that did not come through

The instructions mark exactly two steps REQUIRED, and the two markers
sucker looks for are those two steps. So a failure can say which one is
missing — the custom prompt, the persona, or both — instead of sending
someone back to re-read a page they have already followed.

Truncation causes the same symptom, so it is still named, but second:
it only applies once the settings really are set.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NX2SsmUqQftWTZAY4BDuFa

src/lib/errors.ts

@@ -74,15 +74,36 @@ export function userFacingMessage(error: unknown): string {
 }
 
 /**
- * The one failure a user can act on: Janitor cut the card short because the
- * bot is bigger than their context size, so the markers sucker reads are gone.
+ * The two markers sucker reads map one-to-one onto the two steps the
+ * instructions mark REQUIRED, so a missing one names the setting that is not
+ * coming through rather than sending people back to re-read everything.
+ *
+ * Truncation produces the same symptom — Janitor cuts a card bigger than the
+ * context size and takes the markers with it — so it is named too, second,
+ * because it only applies once the settings really are right.
  */
-export const TRUNCATED_CARD = new SuckerError(
-  "The card came through incomplete — the markers sucker looks for are not in " +
-    "it. That usually means the bot is larger than your context size and " +
-    "Janitor cut it short, so raise Context Size in Generation Settings and " +
-    `try again. If it is already generous, re-read the directions on sucker, and ${CONTACT} if it still will not go.`
-);
+export function missingSetup(hasPrompt: boolean, hasPersona: boolean): SuckerError {
+  const PROMPT = "your custom prompt is not coming through as <.> — set it in your API settings";
+  const PERSONA =
+    "your persona is not coming through — it needs the name {{user}} and a description of just a dot";
+
+  let what: string;
+  if (!hasPrompt && !hasPersona) {
+    what =
+      "neither of the two required settings came through: the custom prompt " +
+      "has to be <.>, and your persona needs the name {{user}} with a " +
+      "description of just a dot";
+  } else {
+    what = hasPrompt ? PERSONA : PROMPT;
+  }
+
+  return new SuckerError(
+    `Sucker could not read that card: ${what}. Save it, then refresh Janitor — ` +
+      "the settings page, not sucker. If it is already set that way, the bot is " +
+      "probably bigger than your context size and Janitor cut the card short, " +
+      `so raise Context Size in Generation Settings. Still stuck: ${CONTACT}.`
+  );
+}
 
 // None of these can happen through Janitor. They exist so that if one ever
 // does, the reply is honest about whose problem it is and the report says