--- title: "Fern: vendor profile | Agent Ready Checklist" description: "Fern, a docs tool: 4 of 7 checklist rows read are met by default, with 7 sourced facts, dated plans and what it does not do." canonical: https://agentreadychecklist.com/vendors/fern site: "Agent Ready Checklist" last_updated: 2026-11-05 section: "Vendors" --- # Fern: vendor profile | Agent Ready Checklist > Fern, a docs tool: 4 of 7 checklist rows read are met by default, with 7 sourced facts, dated plans and what it does not do. Source: https://agentreadychecklist.com/vendors/fern Site: Agent Ready Checklist Last reviewed: 2026-11-05 Agent endpoints: https://agentreadychecklist.com/llms.txt (index), https://agentreadychecklist.com/openapi.json (API), https://agentreadychecklist.com/mcp (MCP server), https://agentreadychecklist.com/ask (search) Access: https://agentreadychecklist.com/auth.md (no key). Pricing: https://agentreadychecklist.com/pricing.md (free). # Fern Fern generates API documentation sites and SDKs from an API definition, and each docs site publishes an automatically maintained llms.txt, a markdown version of every page and an agent note pointing to both, which meets AR-READ-07, AR-READ-09 and AR-READ-06. A hosted MCP server exists only when Ask Fern is enabled, and the pages read document .md URLs, not Accept negotiation. ## At a glance Type [Docs tool](https://agentreadychecklist.com/vendors/by-type/docs-tool/) Homepage [buildwithfern.com](https://buildwithfern.com), answered HTTP 200 on 2026-11-05 Checklist rows 7 of 31 read: **4** supported, 1 partial, 2 no statement Last read 2026-11-05 ## What it does for this layer - Fern docs state that Fern implements llms.txt by "automatically generating and maintaining an llms.txt Markdown file" for each documentation site. primary source: [buildwithfern.com/learn/docs/ai-features/llms-txt](https://buildwithfern.com/learn/docs/ai-features/llms-txt), read 2026-11-05 - Fern docs pages tell agents to append /llms.txt to any URL for a page-level index, or .md for the markdown version of a page. primary source: [buildwithfern.com/learn/docs/ai-features/llms-txt](https://buildwithfern.com/learn/docs/ai-features/llms-txt), read 2026-11-05 - Fern docs say Fern generates and hosts a Model Context Protocol (MCP) server for every documentation site that has Ask Fern enabled. primary source: [buildwithfern.com/learn/docs/ai-features/mcp-server](https://buildwithfern.com/learn/docs/ai-features/mcp-server), read 2026-11-05 - On Fern sites with authentication, MCP clients must send a FERN\_TOKEN header with a valid JWT, or the server returns only public content. primary source: [buildwithfern.com/learn/docs/ai-features/mcp-server](https://buildwithfern.com/learn/docs/ai-features/mcp-server), read 2026-11-05 - Fern docs pages carry "Copy page" and "View as Markdown" actions, seen on the llms.txt page on 2026-11-05. observed: [buildwithfern.com/learn/docs/ai-features/llms-txt](https://buildwithfern.com/learn/docs/ai-features/llms-txt), read 2026-11-05 - Fern's pricing page lists a Free plan at $0 a month, "Free forever", and a custom-priced Enterprise plan. primary source: [buildwithfern.com/pricing](https://buildwithfern.com/pricing), read 2026-11-05 - Fern's pricing page includes a plan column labelled "Postman Customer". observed: [buildwithfern.com/pricing](https://buildwithfern.com/pricing), read 2026-11-05 ## Products and plans | Product | What it is | Price | As of | | --- | --- | --- | --- | | Fern Free | Docs site and SDK generation for developers and teams. | Free forever; buildwithfern.com/pricing | 2026-11-05 | | Fern Enterprise | Custom plan with uptime SLA, dedicated support and enterprise MSA. | Price on request; buildwithfern.com/pricing | 2026-11-05 | ## Standards | Row | What it asks | Status | What the vendor's pages say | Source | | --- | --- | --- | --- | --- | | AR-FIND-03 | Sitemap listed in robots.txt | no statement | Sitemap behaviour was not covered by the pages read. | none | | AR-READ-06 | Link the discovery files | supports | Docs pages carry an agent note pointing to /llms.txt and .md versions. | buildwithfern.com/learn/docs/ai-features/llms-txt | | AR-READ-07 | Ship llms.txt | supports | llms.txt is generated and maintained automatically. | buildwithfern.com/learn/docs/ai-features/llms-txt | | AR-READ-09 | Advertise a markdown mirror | supports | Every page has a .md version and a View as Markdown action. | buildwithfern.com/learn/docs/ai-features/llms-txt | | AR-ACT-02 | OpenAPI contract | supports | Docs and SDKs are generated from the API definition. | buildwithfern.com/pricing | | AR-ACT-03 | MCP over Streamable HTTP | partial | A hosted MCP server is generated when Ask Fern is enabled. | buildwithfern.com/learn/docs/ai-features/mcp-server | | CF-MARKDOWN-NEGOTIATION | Markdown by Accept | no statement | The pages read today document .md URLs, not Accept negotiation. | none | ## Checks on its own site | Reading | Result | Date | Source | | --- | --- | --- | --- | | Cloudflare scan of buildwithfern.com | 27 of 100, band L1 Basic Web Presence | 2026-11-05 | isitagentready.com | ## What it does not do - Fern does not generate the docs MCP server unless Ask Fern is enabled on the site. - Fern does not publish list prices for its Enterprise plan. ## Reading notes The "Postman Customer" column suggests a Postman relationship; no Fern or Postman announcement was read to confirm ownership. ## Related pages on this site Same type [Docs tools](https://agentreadychecklist.com/vendors/by-type/docs-tool/), [all vendors](https://agentreadychecklist.com/vendors/) ## Sources - [buildwithfern.com](https://buildwithfern.com)read 2026-11-05 - [buildwithfern.com/learn/docs/ai-features/llms-txt](https://buildwithfern.com/learn/docs/ai-features/llms-txt)read 2026-11-05 - [buildwithfern.com/learn/docs/ai-features/mcp-server](https://buildwithfern.com/learn/docs/ai-features/mcp-server)read 2026-11-05 - [buildwithfern.com/pricing](https://buildwithfern.com/pricing)read 2026-11-05 - [isitagentready.com](https://isitagentready.com/)read 2026-11-05 Edition Data 2026-11-04 Reviewed 2026-11-05 Spec AgentReady v2.0, 273d2d7 Crawl 13,071 rows, 2026-11-04 Ora 132 checks, contract 1.38.0, 2026-11-05 Verify with Ora The scanner this site recommends for the whole checklist. 132 checks, a score out of 100, no account. `npx ax@0.10 audit --min-score ` [Why Ora, and its limits](https://agentreadychecklist.com/verify-with-ora/) Method - [How rows, commands and rates are made](https://agentreadychecklist.com/method/) - [How an Ora check is matched to a row](https://agentreadychecklist.com/checklist/ora-checks/) - [Pass rates by rank band](https://agentreadychecklist.com/data/by-rank/) Sources and read dates sit at the foot of the page. Last reviewed 2026-11-05. AgentReady v2.0, read 2026-11-04.