docs: document fern mcp install

fern/products/cli-api-reference/pages/commands.mdx

@@ -14,6 +14,7 @@ hideOnThisPage: true
 | [`fern downgrade`](#fern-downgrade) | Move the Fern CLI version in `fern.config.json` back to an older version |
 | [`fern login`](#fern-login) | Login to Fern CLI via GitHub, Google, Postman, or enterprise SSO |
 | [`fern logout`](#fern-logout) | Log out of the Fern CLI |
+| [`fern mcp install`](#fern-mcp-install) | Connect Claude Code, Cursor, or Codex to Fern's MCP server |
 | [`fern export`](#fern-export) | Export an OpenAPI spec for your API |
 | [`fern api update`](#fern-api-update) | Manually update your OpenAPI spec |
 | [`fern api enrich`](#fern-api-enrich) | Merge `x-fern-examples` from an overrides file into native OpenAPI examples |
@@ -857,6 +858,54 @@ hideOnThisPage: true
 
   </Accordion>
 
+  <Accordion title="fern mcp install">
+
+    Use `fern mcp install` to connect a coding agent to Fern's MCP server, which exposes tools for searching your published documentation and reading your site configuration, analytics, and reader feedback. The command writes the token from [`fern login`](#fern-login) into the agent's config, so the agent doesn't go through a second OAuth flow:
+
+    <CodeBlock title="terminal">
+    ```bash
+    fern mcp install [--client claude|cursor|codex] [--org <org>]
+    ```
+    </CodeBlock>
+
+    From a machine with no Fern CLI yet:
+
+    <CodeBlock title="terminal">
+    ```bash
+    npm i -g fern-api
+    fern login
+    fern mcp install
+    ```
+    </CodeBlock>
+
+    Without flags, the command configures every supported agent installed on the machine, adding a `fern` server entry that holds the server URL and an `Authorization` header. Other entries and surrounding content in each file are preserved.
+
+    | Client | Config file |
+    |--------|-------------|
+    | Claude Code | `~/.claude.json` |
+    | Cursor | `~/.cursor/mcp.json` |
+    | Codex | `~/.codex/config.toml` |
+
+    The MCP server authenticates a user rather than an organization, so a `FERN_TOKEN` registry token is rejected: log in with [`fern login`](#fern-login) instead. The token written into the agent config doesn't refresh, so when the server starts returning 401s, run `fern login && fern mcp install` again.
+
+    ### client
+
+    Use `--client` to configure specific agents instead of every one detected. Repeat the flag to name more than one.
+
+    ```bash
+    fern mcp install --client claude --client cursor
+    ```
+
+    ### org
+
+    Use `--org` to override the organization ID from `fern.config.json`. The organization scopes the server URL to `https://fai.buildwithfern.com/organizations/<org>/mcp`. Outside a Fern project, the command falls back to the unscoped `https://fai.buildwithfern.com/mcp`.
+
+    ```bash
+    fern mcp install --org my-org
+    ```
+
+  </Accordion>
+
   <Accordion title="fern token">
 
     <Markdown src="/snippets/fern-token.mdx" />

fern/products/docs/pages/ai/mcp-server.mdx

@@ -102,3 +102,5 @@ This is especially useful on [authenticated sites](/learn/docs/authentication/ov
 
 Agents can also fetch documentation directly over HTTP. Fern serves clean Markdown via [per-page URLs and `llms.txt`](/learn/docs/ai-features/markdown) — including on authenticated sites.
 
+Fern hosts a separate MCP server for your Fern organization, which searches your published pages and reads your site configuration, analytics, and reader feedback. Run [`fern mcp install`](/learn/cli-api-reference/cli-reference/commands#fern-mcp-install) to connect Claude Code, Cursor, or Codex to it.
+