VerifyGate — evidence record

Repair report

spec: stringtools-slugify-fix · mode: real · LLM adapter: nebius-token-factory

final verdict: PASS · repair rounds used: 2 / 3 · stopped: passed

LLM usage total: 3 call(s), 9407 total token(s)

last patch error: stringtools.py: hunk @@ -5 @@ does not match the file on disk (context/removed lines differ)

Replay

python3 -m verifygate run --spec samples/spec.json --candidate samples/failing --mode real

spec hash: 5477ea11ac6b862af5012c86edb334f6a498b1d674377e5c1e0a0a3c8814aba0
candidate tree hash: 5aa2047a510a0078a21ca17aec3dba1417fdb5e807a68143aee17e13683a5eec
record hash: 5ebb2585acfa7bd95c5c07b95fa142cc7e145f59d7f5d3e29cbb71e8b64131e7
signature: 9e02178853b46d66a62888fb9c91bcb7…

Signed with the labelled public development key (demonstrates the mechanism; not production key management).

unit_tests FAIL

python3 -m pytest -q

exit code: 1 · duration: 1961 ms · timed out: False

FFF.                                                                     [100%]
=================================== FAILURES ===================================
______________________________ test_slugify_basic ______________________________

    def test_slugify_basic():
>       assert slugify("Hello World") == "hello-world"
E       AssertionError: assert 'Hello-World' == 'hello-world'
E         
E         - hello-world
E         ? ^     ^
E         + Hello-World
E         ? ^     ^

test_stringtools.py:5: AssertionError
___________________________ test_slugify_punctuation ___________________________

    def test_slugify_punctuation():
>       assert slugify("Hello, World!") == "hello-world"
E       AssertionError: assert 'Hello,-World!' == 'hello-world'
E         
E         - hello-world
E         ? ^     ^
E         + Hello,-World!
E         ? ^    + ^    +

test_stringtools.py:9: AssertionError
______________________ test_slugify_collapses_separators _______________________

    def test_slugify_collapses_separators():
>       assert slugify("  Multiple   Spaces  ") == "multiple-spaces"
E       AssertionError: assert 'Multiple---Spaces' == 'multiple-spaces'
E         
E         - multiple-spaces
E         ? ^        ^
E         + Multiple---Spaces
E         ? ^        ^^^

test_stringtools.py:13: AssertionError
=========================== short test summary info ============================
FAILED test_stringtools.py::test_slugify_basic - AssertionError: assert 'Hell...
FAILED test_stringtools.py::test_slugify_punctuation - AssertionError: assert...
FAILED test_stringtools.py::test_slugify_collapses_separators - AssertionErro...
3 failed, 1 passed in 0.17s

entry hash: 7327b9f76850f1ab…

repro_script FAIL

python3 repro.py

exit code: 1 · duration: 127 ms · timed out: False

Traceback (most recent call last):
  File "/tmp/verifygate-w1ncr6uq/repro.py", line 5, in <module>
    assert result == "hello-world", f"slugify repro failed: got {result!r}"
           ^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: slugify repro failed: got 'Hello,-World!'

entry hash: 2f9e14a2a247eec3…

Diagnosis commentary — never a verdict input

**What failed**

- `unit_tests` – three tests in `test_stringtools.py` (`test_slugify_basic`, `test_slugify_punctuation`, `test_slugify_collapses_separators`) all failed because the `slugify` function returned strings that were **not lower‑cased**, **kept punctuation**, and **did not collapse consecutive spaces/hyphens**.
- `repro_script` – the same assertion error (`got 'Hello,-World!'`) shows the repro script exercises the same faulty path.

**Most likely cause**

The current `slugify` implementation probably:

1. Only replaces spaces with a hyphen (or does nothing to case).
2. Does **not** convert the input to lower case.
3. Does **not** strip or replace punctuation/special characters.
4. Treats each space character individually, so multiple spaces become multiple hyphens instead of a single hyphen.

**Smallest next fix to try**

Replace the body of `slugify` with a concise, correct version that:

- Lower‑cases the string.
- Substitutes any run of non‑alphanumeric characters with a single hyphen.
- Strips leading/trailing hyphens.

```python
import re

def slugify(text: str) -> str:
    text = text.lower()
    text = re.sub(r'[^a-z0-9]+', '-', text)
    return text.strip('-')
```

*If the existing code already imports `re`, just add the three lines above; otherwise add the import.* This change should make all three unit tests and the repro script pass.

LLM adapter: nebius-token-factory · reference source: tavily

References unavailable: TAVILY_API_KEY is not set; references skipped (diagnosis proceeds without them) The verdict above does not depend on references.

LLM usage sealed in the hash chain

Total tokens: 1469

Patch from previous attempt applied to: stringtools.py

Replay

python3 -m verifygate replay --record <repair-report.json> --spec samples/spec.json --candidate samples/failing --mode real # attempt 2: patched copy, reconstructed from the report's recorded patch

spec hash: 5477ea11ac6b862af5012c86edb334f6a498b1d674377e5c1e0a0a3c8814aba0
candidate tree hash: e7ab716b969113764755f5ebd36f9d8d2fe694aab1ade68c93aca2919f213384
record hash: d96d16a1b76b8925e7eb8eb21a43fafda2c67c7fa9160e9466fe229630f57e20
signature: f99199820bb8da5f040144a6f4d83714…

Signed with the labelled public development key (demonstrates the mechanism; not production key management).

unit_tests PASS

python3 -m pytest -q

exit code: 0 · duration: 3723 ms · timed out: False

....                                                                     [100%]
4 passed in 0.19s

entry hash: b919e96720b6fea0…

repro_script PASS

python3 repro.py

exit code: 0 · duration: 289 ms · timed out: False

repro OK: hello-world

entry hash: 1b198174148dbc6f…

LLM usage sealed in the hash chain

Total tokens: 7938