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Spec Registry

Help agents understand your dependencies

Install version-accurate specs that give agents guidance on every library in your project.

npx @tessl/cli@latest registry sync
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Featured Specs

spec:npm-tanstack--react-router
npm•26 days ago
spec:pypi-langgraph-sdk
pypi•about 1 month ago
spec:pypi-streamlit
pypi•about 1 month ago
spec:pypi-pydantic-ai
pypi•about 1 month ago
spec:pypi-openai
pypi•about 1 month ago
spec:pypi-fastmcp
pypi•about 1 month ago
spec:pypi-fastapi
pypi•about 1 month ago
spec:pypi-anthropic
pypi•about 1 month ago
spec:npm-tanstack--react-start
npm•about 1 month ago
spec:npm-react-aria
npm•about 1 month ago
spec:npm-express
npm•about 1 month ago
spec:npm-axios
npm•about 1 month ago
spec:npm-anthropic-ai--sdk
npm•about 1 month ago
spec:npm-svelte
npm•about 1 month ago
spec:npm-lodash
npm•about 1 month ago
spec:maven-apache-spark
maven•about 1 month ago
spec:npm-react
npm•about 1 month ago
10,000+ specs for popular open-source packages

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The Tessl Framework enables agents to define specifications before coding and maintain detailed, up-to-date plans throughout development, ensuring they stay on track.

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