We tested AI agents with and without an SDK. The SDK won.
Claude agents built a Square payments integration on raw HTTP, with an OpenAPI Generator SDK, and with Square's Fern-generated SDK. With Square's SDK, 11 of 12 integrations worked in production. With the other two setups, 2 of 12 did.
Mathieu Legault
EngineeringHow we built Fern Agent
How we built Fern Agent: why we persisted conversations before it had a single tool, taught it that valid markdown isn't valid Fern, and secured write access to customer docs before it shipped.
Clay TondreauMathieu Legault
ProductOne agent for your documentation
Fern Agent is live in your Dashboard, Slack, and coding agent via MCP. It edits your markdown, restructures your nav, fixes your CSS, and answers from your real analytics, all from one conversation.
Kapil Gowru
StrategyHow I ship Fern's marketing content using skills
I own marketing content at Fern: case studies, launch posts, engineering blogs, and the monthly changelog. Most of it starts as output from a Claude skill, and none of it ships without my edits.
Devin Logan
StrategyHow I run six figures of paid ads
I set up an agent-friendly marketing engine that doubled demos, took 90% search impression share, and increased site traffic by 202%.
Kapil Gowru
DesignHow I perfected Midjourney prompts for our marketing assets
The process of landing on a Midjourney prompt that generates beautiful, on-brand background imagery for our marketing assets.
Kapil Gowru
CompanyFrom Fern customer to Fern sales engineer
Adi joined Fern as a sales engineer in June '26 after using Fern as a customer at a software analytics company. He walks through why he made the switch and the RBAC preview feature he shipped soon after.
Adi David
EngineeringOur largest docs sites now render ~6.4x faster
Our docs platform used to store each entire site as a single monolithic JSON object. Here's why that fell apart, and how we rebuilt storage so a one-page edit only touches the one page.
Sandeep Dinesh
Chris Broadfoot
DesignHow 2 designers and AI rebuilt Fern's marketing site
How we leveraged AI in our design process. We set the creative direction up front and refined the final details ourselves; AI handled the middle of the process.
Kapil GowruMathieu Legault
StrategyRevamping our website
Investing in the future of developer and agent experience tooling.
Danny Sheridan
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