For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
Book a demoLog inStart for free
  • Overview
    • Introduction
    • How it works
    • Quickstart
    • Customer showcase
  • Working with SDKs
    • Project structure
    • Adding custom code
    • Migrating to Replay
    • Capabilities
  • Generators
      • Generating an SDK
      • Publishing to PyPI
      • Configuration
      • Adding custom code
      • Dynamic authentication
      • aiohttp support
      • Changelog
      • Customer showcase
  • Reference
    • generators.yml
Checking status...
SOC2Soc 2 Type II
© 2026 Fern • Birch Solutions, Inc., a Postman company

Documentation

SDKsDocsAsk FernCLI Reference

API Definitions

OpenAPIAsyncAPIOpenRPCgRPC

Resources

BlogSupportPricing

Company

Brand KitPrivacy PolicyTerms of Service
LogoLogo
Book a demoLog inStart for free
GeneratorsPython

Changelog

May 18, 2026
May 18, 2026

5.12.12

(fix): Fix test_aiohttp_autodetect.py and _default_clients.py to use the configured package_name instead of the raw organization name. Previously, when package_name in generators.yml differed from organization in fern.config.json, the generated aiohttp test used incorrect import paths and the pip install error message contained a hardcoded literal “package” instead of the actual package name.

5.12.11

(chore): Update OS packages in the Python SDK generator container from Debian sid to fix krb5 (CVE-2026-40355, CVE-2026-40356), curl (CVE-2026-1965, CVE-2026-4873, CVE-2026-5545, CVE-2026-6253, CVE-2026-6429), gnutls28 (CVE-2026-3832), and expat (CVE-2026-45186).

Was this page helpful?
Edit this page
Previous

May 19, 2026

Next

May 15, 2026