The five envelopes · SDKs & libraries

SDKs & libraries — code you import

A library is software you pull INTO your program: install the package, import it, and its functions become part of your code. An SDK (software development kit) is a vendor's official library — Stripe's stripe, AWS's boto3 — the door the vendor built so your code can drive their service.

Agents that write code lean on this envelope constantly: when an agent generates a script, the imports it chooses are libraries. A hallucinated or abandoned package is one of the classic agent failure modes — which is exactly what a verified, weekly-rechecked registry of packages that actually resolve is for.

543listed & checked

543verified & signed

150official (vendor's own)

0execution-verified

What “verified” means here

A library record is static-verified when the package actually resolves on its registry (npm or PyPI) — it exists, it's fetchable, its metadata is real, and we record when it was last published so staleness is visible. Officialness means the package is published by the vendor's own verified organization.

Honest tiers, always: “not yet verified” is never “failed”. Full methodology →

Top verified SDKs & libraries

Ordered by verification score, then adoption — deterministic and explainable. “Top” means most-verified, never most-marketed: rankings are never for sale.

1.@ai-sdk/anthropicofficial · static-verified · score 100
The **[Anthropic provider](https://ai-sdk.dev/providers/ai-sdk-providers/anthropic)** for the [AI SDK](https://ai-sdk.dev/docs) contains language model support for the [Anthropic Messages API](https://docs.anthropic.com/claude/reference/mes
2.@ai-sdk/reactofficial · static-verified · score 100
[React](https://react.dev/) UI components for the [AI SDK](https://ai-sdk.dev/docs):
3.@azure/identityofficial · static-verified · score 100
Provides credential implementations for Azure SDK libraries that can authenticate with Microsoft Entra ID
4.@azure/opentelemetry-instrumentation-azure-sdkofficial · static-verified · score 100
Instrumentation client for the Azure SDK.
5.@azure/storage-blobofficial · static-verified · score 100
Microsoft Azure Storage SDK for JavaScript - Blob
6.@clickhouse/clientofficial · static-verified · score 100
Official JS client for ClickHouse DB - Node.js implementation
7.@clickhouse/client-webofficial · static-verified · score 100
Official JS client for ClickHouse DB - Web API implementation
8.@elastic/elasticsearchofficial · static-verified · score 100
The official Elasticsearch client for Node.js
9.@google-cloud/assetofficial · static-verified · score 100
Cloud Asset API client for Node.js
10.@google-cloud/cloudbuildofficial · static-verified · score 100
Cloud Build API client for Node.js
11.@google-cloud/containerofficial · static-verified · score 100
Google Container Engine API client for Node.js
12.@google-cloud/dataprocofficial · static-verified · score 100
Google Cloud Dataproc API client for Node.js
13.@google-cloud/discoveryengineofficial · static-verified · score 100
Discovery Engine API client for Node.js
14.@google-cloud/dlpofficial · static-verified · score 100
DLP API client for Node.js
15.@google-cloud/kmsofficial · static-verified · score 100
Google Cloud Key Management Service (KMS) API client for Node.js

Looking for something specific? Ask from the homepage or hit /api/answer?q=… — one verified answer, or an honest no.