> ## Documentation Index > Fetch the complete documentation index at: https://help.heydenada.com/llms.txt > Use this file to discover all available pages before exploring further. # The library editor > Edit blocks, parameters, the shell, versions, and publishing from the library editor The library editor is where a library's blocks, parameters, and settings are built and maintained. Open it by clicking **Libraries** in the sidebar, then clicking any library. The library editor with the library's blocks rendered in the preview and the sidebar showing the block list grouped by category The editor has two parts: a preview of the library's blocks rendered with their example values, and a sidebar with four tabs — **Chat**, **Edit**, **Versions**, and **Options**. Click any block in the preview to jump straight to it in the sidebar. If the selection overlays get in your way, open the library menu and turn on **Disable overlays** to click elements in the rendered preview directly. ## Chat tab The **Chat** tab works like project chat, but for the library itself: describe blocks you want, ask Denada to restyle existing ones, or have it define parameters — and it edits the library directly. You can keep multiple chats, including private chats only you can see. The chat list also offers **Edit with external tools**, which walks you through connecting an AI agent like Claude Code or Codex to work on the library from outside Denada. See [Working with AI agents](/agents/overview). ## Edit tab The **Edit** tab lists the library's blocks. Click **New** to add one: * **New empty block…** — start a fresh block and write or paste its HTML. * **Paste block…** — paste a block copied from another library. Click a block to open its settings: * **Published** — whether the block is available for building projects. Keep a block unpublished while it's a work in progress. * **Category** — groups related blocks (headers, content, footers); choose **New category…** to create one. * **Block HTML** — opens the block's HTML editor. Block HTML is written with [Eta](https://eta.js.org) syntax, so it can reference the block's parameter values. * **Appearance** — a short written description of what the block looks like, since Denada cannot "see" the rendered result. * **Chat instructions** — guidance for Denada on how to fill out this block when building projects. ### Parameters Below the block's settings is its parameter list. Click **New parameter…** to add one, or click an existing parameter to edit its type, default value, and instructions. Parameters can be of type **Text**, **Link**, **Image**, **Boolean**, **Enum**, **Color**, **Insets**, or **List** (a repeating group of content within a block) — see the [libraries overview](/libraries/libraries-overview#parameter-types) for what each is for. The Photo Hero block open in the library editor sidebar, with its appearance, chat instructions, and parameter list ## Versions tab The **Versions** tab is the library's history: * Checkpoint versions are created automatically after 30 minutes of inactivity. * Click **Save current version** to record a named version at a meaningful milestone. * Changes committed by connected AI agents appear here too, with the message the agent supplied. Each version's menu lets you **Rename version**, **Restore this version**, create a **New library from this version**, or **Set as current version**. Setting a current version marks a stable release: projects that adopt the library use that version instead of the latest draft. Selecting a version shows the library as it was at that point, so you can review before restoring. ## Options tab The **Options** tab holds library-wide settings: * **Published** — makes the library available to Denada and your team for building projects. * **Type** — **Email** or **Site** (landing pages). * **Scripting language** — enables dynamic content for [personalization](/editor/personalization), wrapped in this syntax on export: **Liquid** (Braze, Mailchimp, Shopify) or **Django** (Klaviyo). Leave it on **None** to disable dynamic content for this library. * **Thumbnail** — an optional image that replaces the full library rendering in tiles. * **Shell HTML** — opens the editor for the library's shell (see below). * **Chat instructions** — guidance for Denada on how to use the library as a whole. For example, you might explain to include one header block, up to five body blocks, then a standard footer. * **Theme** — the library-level parameters, shared by every block. ## The shell The shell is the outer HTML document that wraps the assembled blocks in every rendered project: the ``, font loading ([hosted fonts](/libraries/fonts) give you permanent `@font-face` URLs), CSS resets, and page frame. Edit it from **Options** → **Shell HTML**. Parameters you define at the shell level appear in the **Theme** panel and are available to every block — ideal for shared values like a brand color. ## Publishing Publishing happens at two levels: * **The library** — the **Published** toggle in **Options** controls whether the library is available at all. * **Individual blocks** — each block's **Published** toggle controls whether that block is offered when building projects. You can also publish or unpublish a block directly from its tile in the block list. ## Undo and redo Every change in the library editor is undoable. Use the library menu's undo and redo items, or press Cmd+Z and Shift+Cmd+Z (Ctrl+Z / Ctrl+Y on Windows). ## The library menu The menu in the editor's header collects library-wide actions: * **Rename** — rename the library. * **Edit combined HTML** — edit all of the library's block HTML in a single document. * **Edit library file** — edit the library's portable text format directly, like a virtual export and re-import. * **Export library** — download a `.library` file that can be imported into another team. * **Import library** — replace this library's contents with an uploaded `.library` file. A checkpoint of the current version is saved first. * **Delete library** — delete the library.