Swift Coding AgentsPreviewThis index is in active development: we are still adding agents, refining attribution signatures, and verifying data against sources. The date in the header is when key figures were last re-checked. Numbers can move as coverage improves.
In Swift repos on public GitHub, 33,098 PRs carried an agent mark between 2026-05 window start and end, which is 30.7% of all Swift PRs. Claude Code does the most of it.
Coverage: tracks Claude Code, Codex, Copilot agent, Cursor, Devin, and Jules. Codex is measured through hosted task metadata, checked against sampled PRs. Gemini CLI and other terminal agents work through the developer's own identity, leaving nothing public we can detect yet, so they cannot be measured here. We are expanding coverage. Methodology
33,098
Agent-marked PRs
Latest month window
30.7%
Of all Swift PRs
108K total in window
Claude Code
Does the most Swift
63% of agent-marked PRs
16
Months tracked
Updated monthly
Who Does The Swift Work
Agent-marked PRs in Swift repos, latest month. Counts link to the live GitHub search.
Swift Over Time
Agent-marked Swift PRs per month by agent, or each agent's share of them.