fix: ignore synthetic depth for 2-D Ocean products

codex_harness.py

@@ -148,6 +148,20 @@ class CodexHarness:
         if short not in allowed or not hasattr(marine_mcp, short):
             raise ValueError("unsupported Marine tool: " + str(name))
         args = dict(arguments or {})
+        # OpenCode models sometimes emit depth=0 for every Ocean request.
+        # ERA5, ERA5 accumulated fields, OISST and OC-CCI are 2-D products;
+        # forwarding that synthetic depth makes the school API reject a valid
+        # request with "has no depth dimension".  Preserve non-zero explicit
+        # depths so an actually invalid user request still gets the server's
+        # honest validation error.
+        if short in {"marine_export", "marine_subset"}:
+            source = str(args.get("source") or "").strip().lower()
+            if source in {"era5", "era5_accum", "oisst", "occci", "oc-cci"}:
+                try:
+                    if float(args.get("depth")) == 0.0:
+                        args.pop("depth", None)
+                except (TypeError, ValueError):
+                    pass
         result = getattr(marine_mcp, short)(**args)
         return CodexHarness._jsonable(result)