fix: coerce array values to strings in session_close closing_reflection

Agents frequently pass arrays instead of strings for institutional_memory_items,
collaborative_dynamic, and rapport_notes. Rather than rejecting with a schema
error (wasting tokens on every session close), accept both formats and
auto-join arrays with ". " separator.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

src/schemas/session-close.ts

@@ -17,11 +17,11 @@ export const ClosingReflectionSchema = z.object({
   wrong_assumption: z.string(),
   scars_applied: z.union([z.string(), z.array(z.string())]),
   /** Q7: What from this session should be captured as institutional memory? */
-  institutional_memory_items: z.string().optional(),
+  institutional_memory_items: z.union([z.string(), z.array(z.string()).transform((arr) => arr.join(". "))]).optional(),
   /** Q8: How did the human prefer to work this session? */
-  collaborative_dynamic: z.string().optional(),
+  collaborative_dynamic: z.union([z.string(), z.array(z.string()).transform((arr) => arr.join(". "))]).optional(),
   /** Q9: What collaborative dynamic worked or didn't work? */
-  rapport_notes: z.string().optional(),
+  rapport_notes: z.union([z.string(), z.array(z.string()).transform((arr) => arr.join(". "))]).optional(),
 });
 
 export type ClosingReflection = z.infer<typeof ClosingReflectionSchema>;

tests/unit/schemas/session-close.test.ts

@@ -426,5 +426,49 @@ describe("ClosingReflectionSchema", () => {
       expect(result.data?.collaborative_dynamic).toBe("Directive style");
       expect(result.data?.rapport_notes).toBe("High-energy iteration");
     });
+
+    it("coerces institutional_memory_items array to joined string", () => {
+      const result = ClosingReflectionSchema.safeParse({
+        what_broke: "Nothing",
+        what_took_longer: "Tests",
+        do_differently: "Plan better",
+        what_worked: "Communication",
+        wrong_assumption: "None",
+        scars_applied: [],
+        institutional_memory_items: ["pool.map pickles args", "use globals for COW"],
+      });
+      expect(result.success).toBe(true);
+      expect(result.data?.institutional_memory_items).toBe(
+        "pool.map pickles args. use globals for COW"
+      );
+    });
+
+    it("coerces collaborative_dynamic array to joined string", () => {
+      const result = ClosingReflectionSchema.safeParse({
+        what_broke: "Nothing",
+        what_took_longer: "Tests",
+        do_differently: "Plan better",
+        what_worked: "Communication",
+        wrong_assumption: "None",
+        scars_applied: [],
+        collaborative_dynamic: ["Direct style", "Fast iteration"],
+      });
+      expect(result.success).toBe(true);
+      expect(result.data?.collaborative_dynamic).toBe("Direct style. Fast iteration");
+    });
+
+    it("coerces rapport_notes array to joined string", () => {
+      const result = ClosingReflectionSchema.safeParse({
+        what_broke: "Nothing",
+        what_took_longer: "Tests",
+        do_differently: "Plan better",
+        what_worked: "Communication",
+        wrong_assumption: "None",
+        scars_applied: [],
+        rapport_notes: ["Push-back welcomed", "High-energy"],
+      });
+      expect(result.success).toBe(true);
+      expect(result.data?.rapport_notes).toBe("Push-back welcomed. High-energy");
+    });
   });
 });