VerifyGate — evidence record
AI proposes. Deterministic checks dispose. The evidence record proves it.
Repair report
spec: stringtools-slugify-fix · mode: real · LLM adapter: nebius-token-factory
final verdict: PASS · repair rounds used: 1 / 3 · stopped: passed
LLM usage total: 2 call(s), 5367 total token(s)
Attempt 0 — FAIL
Replay
python3 -m verifygate run --spec samples/spec.json --candidate samples/failing --mode real
spec hash: 5477ea11ac6b862af5012c86edb334f6a498b1d674377e5c1e0a0a3c8814aba0
candidate tree hash: 5aa2047a510a0078a21ca17aec3dba1417fdb5e807a68143aee17e13683a5eec
record hash: 0daa6dfb9211c87d3a602606ab598671445e60ad400010cbc9b3c320514abf4e
signature: 6390f8a461c3249f65256436ef3fd4db…
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: 309 ms · timed out: False
stdout tail
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 0.03s
entry hash: 570180e010ab0451…
repro_script FAIL
python3 repro.py
exit code: 1 · duration: 29 ms · timed out: False
stderr tail
Traceback (most recent call last):
File "/tmp/verifygate-l3qnnlce/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: 69c6e9ec4cd5ce0f…
Diagnosis commentary — never a verdict input
**What failed**
| Check | Failure details |
|-------|-----------------|
| `unit_tests` (`pytest`) | Three assertions in `test_stringtools.py` failed:<br>• `slugify("Hello World")` returned `'Hello‑World'` (expected `'hello‑world'`).<br>• `slugify("Hello, World!")` returned `'Hello,-World!'` (expected `'hello‑world'`).<br>• `slugify(" Multiple Spaces ")` returned `'Multiple---Spaces'` (expected `'multiple‑spaces'`). |
| `repro_script` (`python3 repro.py`) | Same mismatch: `slugify("Hello, World!")` gave `'Hello,-World!'` instead of `'hello‑world'`. |
All failures stem from the **same `slugify` function**.
**Most likely cause**
The current implementation probably:
1. Does **not convert the input to lower‑case**.
2. Replaces each non‑alphanumeric character (including punctuation and spaces) with a hyphen **individually**, so consecutive spaces/punctuation become multiple hyphens.
3. Does **not strip leading/trailing hyphens** after the replacement.
In short, the function lacks the typical slug‑ification steps: lower‑casing, collapsing any run of non‑alphanumerics into a single hyphen, and trimming edge hyphens.
**Smallest next fix to try**
Replace the body of `slugify` (or edit the existing logic) with a concise, correct version, e.g.:
```python
import re
def slugify(text: str) -> str:
# 1. lower‑case
text = text.lower()
# 2. replace any sequence of non‑alphanumeric chars with a single hyphen
text = re.sub(r'[^0-9a-z]+', '-', text)
# 3. strip hyphens from the start and end
return text.strip('-')
```
*Why this is the smallest change*:
- It adds only three lines (lower‑case, regex substitution, strip).
- It keeps the function signature and any existing imports untouched.
- Running the tests again should make all three slugify tests and the repro script pass.
After applying the fix, rerun:
```bash
python3 -m pytest -q # unit_tests
python3 repro.py # repro_script
```
Both should exit with code 0 and show all tests passing.
LLM adapter: nebius-token-factory · reference source: tavily
LLM usage sealed in the hash chain
| purpose | model | prompt | completion | total |
|---|---|---|---|---|
| explain_failure | nvidia/nemotron-3-super-120b-a12b | 787 | 746 | 1533 |
Total tokens: 1533
Attempt 1 — PASS
Patch from previous attempt applied to: stringtools.py
Replay
python3 -m verifygate replay --record samples/evidence_real_repair.json --spec samples/spec.json --candidate samples/failing --mode real # attempt 1: patched copy, reconstructed from the report's recorded patch
spec hash: 5477ea11ac6b862af5012c86edb334f6a498b1d674377e5c1e0a0a3c8814aba0
candidate tree hash: 065b8671139fe84b89129ae6784082f18114608906316487b2ebbb3c3ae470a6
record hash: 1a8454856058fc5d599065d0de1d8d1b5fe547c7da90dc789e07d339c0cfe804
signature: 14997c9402e9ea7ffca2b237cc9e8160…
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: 468 ms · timed out: False
stdout tail
.... [100%] 4 passed in 0.02s
entry hash: 2fa431c5e62153de…
repro_script PASS
python3 repro.py
exit code: 0 · duration: 40 ms · timed out: False
stdout tail
repro OK: hello-world
entry hash: f1b1cc2ab71f5368…
LLM usage sealed in the hash chain
| purpose | model | prompt | completion | total |
|---|---|---|---|---|
| generate_patch | nvidia/nemotron-3-super-120b-a12b | 1313 | 2521 | 3834 |
Total tokens: 3834