Capture the complete train of thought of agent work as first-class artifacts

Normalize native agent transcripts into a shared trajectory format.

Jacobian-Lens interpretability primitive for open-weight LLMs (Anthropic 2026-07-06, 'Verbalizable Representations Form a Global Workspace'). Reads the model's functional workspace at inference time — lens_l(h)=unembed(J_l·h) — into workspace tokens, laye

Simple and complete React DOM testing utilities that encourage good testing practices.

Simple and complete DOM testing utilities that encourage good testing practices.

[Agentic applications](https://langchain-ai.github.io/langgraph/concepts/agentic_concepts/) give an LLM freedom over control flow in order to solve problems. While this freedom can be extremely powerful, the black box nature of LLMs can make it difficult

Custom jest matchers to test the state of the DOM

Fire events the same way the user does

Delightful JavaScript Testing.

Delightful JavaScript Testing.

ESLint plugin to follow best practices and anticipate common mistakes when writing tests with Testing Library

Simple and complete React hooks testing utilities that encourage good testing practices.

React package for snapshot testing.

The Firebase Authenticaton component of the Firebase JS SDK.

Simple and complete React Native testing utilities that encourage good testing practices.

Color normalization for React Native.

Schemas describing various structures used by nyc and istanbuljs

Simple and complete custom Cypress commands and utilities that encourage good testing practices.

Virtualized lists for React Native.

Polyfills for React Native.