The agent collision index

How often two authors write the same file within an hour of each other, counted every day in the 50 public GitHub repositories where coding agents commit the most. By the memento team.

24 October 2026, UTC

227 files written by two authors within an hour, in 1132 commits across 50 repositories.

24 October 2026, per repository

Method

1. The repositories: the 50 public, non-fork GitHub repositories with the most commits whose message names a coding agent (Claude Code, Cursor, Devin, Copilot, Jules), in a sample of GitHub's commit search: the newest 200 such commits per agent in every six hours of the last 7 days. The list is refreshed weekly.
2. Each day, each repository's default branch is read from git, without file contents, and every whole UTC day is counted on its own.
3. A collision is a file two different authors committed within one hour of each other: the rule of the git log grader, which runs the same code.
4. A repository that cannot be read that day (too big, gone, private) is "unknown", never 0, and stays out of the total.
5. Only dates, repository names and counts are kept: no file, commit message or author. A day, once written, is never changed.

Cite it as: memento, the agent collision index, https://overflow.games/memento/index/, with the date of the day you quote.