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$ evener --model fake/fake-test-model --timeout 2m --max-rounds 8 --sandbox off 'Fix total_cents in receipt.py so each item'"'"'s price is multiplied by its
quantity. Work only in this directory. Read README.md and check.py first.
Run python3 check.py to reproduce the bug, then make the smallest repair
in receipt.py and rerun the check. Do not change check.py or README.md.
Do not commit. Report what changed and the actual check result.'
cwd: receipt-workspace
stdout:
Updated receipt.py to multiply prices by quantities. The checker exited zero.

stderr:
[model] fake-test-model (fake)
[prompt] embedded:prompts/system.md.tmpl (26300B)
[prompt] agent:default (0B)
[usage] in=1 out=1 total=2
[tool] read_file {"file_path":"README.md","intent":"Reading receipt fixture"}
[tool] read_file: done
[usage] in=1 out=1 total=2
[tool] read_file {"file_path":"check.py","intent":"Reading receipt fixture"}
[tool] read_file: done
[usage] in=1 out=1 total=2
[tool] read_file {"file_path":"receipt.py","intent":"Reading receipt fixture"}
[tool] read_file: done
[usage] in=1 out=1 total=2
[tool] shell {"command":"python3 check.py","intent":"Reproducing receipt failure","mode":"foreground"}
[tool] shell: done
[usage] in=1 out=1 total=2
[tool] edit_file {"file_path":"receipt.py","intent":"Fixing quantity multiplication","new_string":"return sum(pric...
[tool] edit_file: done
[usage] in=1 out=1 total=2
[tool] shell {"command":"python3 check.py","intent":"Checking repair","mode":"foreground"}
[tool] shell: done
[usage] in=1 out=1 total=2
[tool] communicate {"end_turn":true,"message":"Updated receipt.py to multiply prices by quantities. The checker exit...
[communicate:end_turn] Updated receipt.py to multiply prices by quantities. The checker exited zero.
[tool] communicate: done

exit: 0

$ git diff -- receipt.py
cwd: receipt-workspace
stdout:
diff --git a/receipt.py b/receipt.py
index c1694dc..965759f 100644
--- a/receipt.py
+++ b/receipt.py
@@ -3,4 +3,4 @@
 
 def total_cents(items):
     """Sum (price_cents, quantity) pairs of nonnegative integers."""
-    return sum(price_cents for price_cents, quantity in items)
+    return sum(price_cents * quantity for price_cents, quantity in items)

stderr:

exit: 0

$ python3 check.py
cwd: receipt-workspace
stdout:
PASS: 4 receipt cases

stderr:

exit: 0