The 500 OSS Performance Index

Repository snapshot

Performance · 90d

31.0ETV

+942.0% since Q2 2025

ETV / dev / mo

4.9ETV

1 dev · 30-day window

Last 7 days · per dev

1.0ETV

per developer per week

Work mix

Growth29%· 30.3Maintenance46%· 48.8Fixes25%· 26.4

105.5 ETV all-time553 commits5 all-time devsJun 2025 – Jun 2026

Monthly reports

Highlights
Introduced significant enhancements to the *tracing subsystem*, including new lifecycle dispatch helpers, scoped context management, and configurable ID generation via [13f7662c · Kazuhiro Sera], [b84c1c44 · Kazuhiro Sera], [647810dd · Kazuhiro Sera], and [8dc00696 · Kazuhiro Sera].
Improved *agent run management* with `RunState` trace clearing for resumed runs and opt-in recovery for missing function tools, implemented in [4f28a02f · Kazuhiro Sera] and [1ce54042 · Kazuhiro Sera].
Added a new `clone` method to the *Handoff* class for flexible instance duplication, as seen in [d2a4687c · Kazuhiro Sera].
Enhanced *usage tracking* with public JSON restoration helpers for `RequestUsage` and `Usage` classes, delivered in [1151713b · Kazuhiro Sera].
Implemented configurable limits for *sandbox archive extraction*, bolstering security and resource management within the sandbox subsystem via [8e59259a · Kazuhiro Sera].
Observations
Commit volume increased by 76% (129 commits this month vs 74-commit 2-month average), and total output surged by 109% (24 vs 11 2-month average), indicating a period of intense development.
The grow score saw a substantial increase of 260% (7 this month vs 2 2-month average), reflecting a strong focus on new feature development and capabilities.
The waste score rose by 197% (8 this month vs 3 2-month average), suggesting a high volume of bug fixes and rework, particularly in critical areas.
The *tracing subsystem* was a hotspot for both new features and bug fixes, with multiple commits addressing issues like model metadata on generation spans [f76fc19f · Xinde Li], context storage injection [cb0b5326 · Kazuhiro Sera], shutdown timeouts [f36e7b2c · Kazuhiro Sera], and best-effort shutdown on process exit [2d398010 · Kazuhiro Sera].
Several fixes targeted *sandbox providers*, improving structured error reporting [c793dfed · Kazuhiro Sera], Cloudflare sandbox error details [6abf0c8e · Kazuhiro Sera], and stabilizing example auto-runs [ff26b89e · Kazuhiro Sera].
Multiple bug fixes addressed issues in *OpenAI Chat Completions* and *AI SDK integration*, including preserving output token details [6d616759 · Kazuhiro Sera], aligning strict validation [22461f23 · Kazuhiro Sera], and handling empty tool outputs [5dd3b2fa · Kazuhiro Sera].
Fixes were implemented to delay *WebRTC* close for transient disconnects [989a4587 · Kazuhiro Sera] and avoid auto-responses for unknown *realtime tools* [3dc9b90a · Kazuhiro Sera], enhancing the stability of real-time communication.
A consistent pattern of *documentation updates* and *CI workflow improvements* was observed, ensuring clarity, accuracy, and reliability of project resources and build processes, as seen in commits like [b85dc351 · Kazuhiro Sera], [94f95ef5 · Kazuhiro Sera], and [d9267cfd · Yazdan Ranjbar].
Performance23.52 ETV+639%
Commits129 ↗+279%
Performance3.18 ETV−84%
Performance19.35 ETV+15%
Performance16.87 ETV−22%
Performance21.61 ETV+319%

Performance over time

ETV stacked by Growth, Maintenance and Fixes — 90-day moving average, normalized to ETV / month.

Average performance per developer

ETV per active developer per month — 30-day moving average.

Active developers over time

Unique developers committing each day — 90-day moving average.

Knowledge concentration

How dependent is this repo on a small number of contributors? Higher top-1 share = higher key-person risk.

Top 1

92.0 %

Top 3

99.5 %

Top 5

100.0 %

Kazuhiro Sera owns 92.0 % of commits.

Top contributors

Most impactful commits

Top 20 by ETV in the all-time window.