Re:Launch HN: Momentic (YC W24) – Agents that catch bugs by ...
by momentichenry on Monday November 02, 2026 @07:20PM
(#50346251)
Hey there! I'm not 100% sure how many came from Mo originally, but I can add a bit about our process:
- The candidate ground truth bugs are generated using runs from all agents
- Every candidate gets reviewed by the other agents to generate a recommendation (just makes human review easier)
- A human reviewer makes the final call (no candidates are discarded just because Mo couldn't reproduce)
And in terms of grading the final runs:
- A lot of the final runs still found a small percentage of novel bugs (5-10%), because it's extremely difficult to build a comprehensive list of all bugs, even after hundreds of runs.
- Nothing that didn't match was auto-discarded (read - it wasn't rejected because Mo couldn't repro).
- All unmatched findings were run through the same human review process as above.
- All the runs were regraded after human review to get a final score with zero unmatched findings.
One interesting thing we did notice during this is that Codex and Claude tend to converge on the same findings run over run (very few initially unmatched findings on final runs), whereas Mo tends to find a lot more novel bugs on ever run.
- The candidate ground truth bugs are generated using runs from all agents
- Every candidate gets reviewed by the other agents to generate a recommendation (just makes human review easier)
- A human reviewer makes the final call (no candidates are discarded just because Mo couldn't reproduce)
And in terms of grading the final runs:
- A lot of the final runs still found a small percentage of novel bugs (5-10%), because it's extremely difficult to build a comprehensive list of all bugs, even after hundreds of runs.
- Nothing that didn't match was auto-discarded (read - it wasn't rejected because Mo couldn't repro).
- All unmatched findings were run through the same human review process as above.
- All the runs were regraded after human review to get a final score with zero unmatched findings.
One interesting thing we did notice during this is that Codex and Claude tend to converge on the same findings run over run (very few initially unmatched findings on final runs), whereas Mo tends to find a lot more novel bugs on ever run.