ui: Custom Prompts library + improvements for System Message, MCP Prompts & Resources UI/UX by allozaur · Pull Request #25034 · ggml-org/llama.cpp

allozaur · 2026-06-26T08:46:49Z

Overview

Demo

prompts-demo-h264.mp4

Prompts library (`/prompts`)

New landing route under the manage sidebar; prompts grouped by category, full-text search
"New chat" on a prompt card opens a conversation with a system message already referencing the prompt
Save any system message as a new prompt via DialogPromptAddNew (title, content, optional category)
Sync a system message from its library source with a CodeDiff preview before applying (DialogPromptSync)
Prompts persist across sessions (IndexedDB-backed)

System messages

One unified editor (ChatMessageEditForm) for user, assistant, and system messages; variant="system" wraps it in the dashed bubble so the read view matches the edit view
Three scenarios covered: library-referenced (with a "Newer version available" hint when stale), placeholder (keeps a prominent "Add to library" CTA), and a fresh in-chat system prompt
Compose-menu gets a system-message submenu: pick an existing library prompt or save a new one inline
Library references are tracked on the message itself (promptId extra), so the editor and the chat display can always look the referenced prompt up

MCP

Server prompt list is fetched eagerly on connect, so prompts, resources, completions, etc. are visible everywhere without an extra round trip
Resources browser dialog is usable on mobile
Removing an MCP server is reactive — its prompts/resources disappear from every UI surface (compose menu, prompts page, resources browser) automatically

UI primitives (new building blocks for future features)

Command (cmdk) palette
InputGroup (with addon / button / input / text / textarea parts)
Toggle, ToggleGroup

Requirements

I have read and agree with the contributing guidelines
AI usage disclosure: YES, MiniMax M3 on HF Inference Providers + Qwen3.6-35B-A3B / Qwen3.6-27B locally

engrtipusultan · 2026-06-26T10:24:42Z

I actually vibed an MCP to achieve such functionality. MCP would scan folder and list mark down files as prompts and through MCP they will be available as assistant prompts.
What I miss is cherry studio like functionality to list them as assistants and group chats under each assistant or to have workflow that will go through multiple assistants.
Would that be possibility going forward?

allozaur · 2026-06-26T10:57:12Z

@@ -134,6 +181,21 @@
 		get rawEditContent() {
 			return rawEditContent;
 		},
+		get isSystemMessage() {
+			return isSystemMessage;
+		},
+		get isSystemPlaceholder() {
+			return isSystemPlaceholder;
+		},
+		get canAddToLibrary() {
+			return canAddToLibrary;
+		},
+		get canUpdateLibraryPrompt() {
+			return canUpdateLibraryPrompt;
+		},
+		get libraryPromptTitle() {
+			return referencedPrompt?.title;
+		},
 		setContent: (content: string) => {
 			editedContent = content;
 		},
@@ -148,19 +210,50 @@
 		},
 		save: handleSaveEdit,
 		saveOnly: handleSaveEditOnly,
+		saveAsLibrary: handleSaveAsLibrary,
+		updateLibraryPrompt: handleUpdateLibraryPrompt,
 		cancel: handleCancelEdit,
 		startEdit: handleEdit
 	});

-	let mcpPromptExtra = $derived.by(() => {
-		if (message.role !== MessageRole.USER) return null;
-		if (message.content.trim()) return null;
-		if (!message.extra || message.extra.length !== 1) return null;
+	let mcpPromptExtra = $derived.by((): DatabaseMessageExtraMcpPrompt | null => {
+		if (message.role === MessageRole.USER) {
+			if (message.content.trim()) return null;
+			if (!message.extra || message.extra.length !== 1) return null;
+
+			const extra = message.extra[0];
+
+			if (extra.type === AttachmentType.MCP_PROMPT) {
+				return extra as DatabaseMessageExtraMcpPrompt;
+			}
+
+			return null;
+		}
+
+		if (message.role === MessageRole.SYSTEM) {
+			// System messages created from an MCP prompt carry the server/prompt
+			// identity through their synthetic `mcp:<server>:<prompt>` promptId.
+			// Treat them as MCP-prompt messages so they render with the same styled
+			// surface instead of a plain system textarea.
+			const custom = customPromptExtra;
+
+			if (!custom?.promptId.startsWith('mcp:')) return null;

-		const extra = message.extra[0];
+			const stripped = custom.promptId.slice('mcp:'.length);
+			const sepIndex = stripped.indexOf(':');

-		if (extra.type === AttachmentType.MCP_PROMPT) {
-			return extra as DatabaseMessageExtraMcpPrompt;
+			if (sepIndex <= 0) return null;
+
+			const serverName = stripped.slice(0, sepIndex);
+			const promptName = stripped.slice(sepIndex + 1);
+
+			return {
+				type: AttachmentType.MCP_PROMPT,
+				name: promptName,
+				serverName,
+				promptName,
+				content: message.content
+			};


if possible, we should move this logic and related markup to somehow manage from ChatMessageCustomPrompt.svelte

awijshoff · 2026-06-26T12:00:19Z

Very cool!

I think Importing/Exporting Prompts (or Prompt-collections), comparable to how chats can be imported/exported would be a nice feature for sharing prompts with other users. "Copying" prompts for A/B-tests might also be useful.

allozaur · 2026-06-26T13:42:59Z

I actually vibed an MCP to achieve such functionality. MCP would scan folder and list mark down files as prompts and through MCP they will be available as assistant prompts. What I miss is cherry studio like functionality to list them as assistants and group chats under each assistant or to have workflow that will go through multiple assistants. Would that be possibility going forward?

we will develop this further to support skills in a similiar way. this PR is a beginning of this type of functionality

allozaur · 2026-06-26T13:43:26Z

Very cool!

I think Importing/Exporting Prompts (or Prompt-collections), comparable to how chats can be imported/exported would be a nice feature for sharing prompts with other users. "Copying" prompts for A/B-tests might also be useful.

yeah, this one i can still squash in this PR

…edDB

…delays

…mponents

…ondition

github-actions Bot added documentation Improvements or additions to documentation server/ui labels Jun 26, 2026

allozaur force-pushed the feat/custom-instructions branch from fa43e12 to 6c1629a Compare June 26, 2026 08:51

allozaur commented Jun 26, 2026

View reviewed changes

allozaur added 22 commits June 28, 2026 13:15

feat: WIP

96a4c24

refactor: Rename instructions to prompts and migrate storage to Index…

2a48638

…edDB

feat: Prompts feature MVP

a9d1a9e

refactor: Post-rebase cleanup

482e1e6

feat: Sync conversation system prompts when library prompts update

c56a3f6

faet: wip

93e87f2

feat: wip

5b6e20b

feat: wip

2d38a47

feat: wip

35a33e0

feat: Eagerly fetch MCP prompts during connection to eliminate async …

def32b8

…delays

refactor: Extract shared layout and routing for management pages

b014c94

fix: Chat and settings UI spacing and labels

7c799d5

feat: Unify system message editing and integrate with prompts library

86a84ba

refactor: Cleanup

746b0e6

feat: Enable prompt title updates during sync and improve edit UI

63643c4

feat: Improve Chat Form Action Add Sheet

cfa4f1b

feat: Improve MCP Resources browser mobile UI

4536083

refactor: Naming

191dc17

chore: Cleanup

2e83dea

refactor: Search Input

3be55c6

refactor: Constants & enums

a095772

refactor: Comments cleanup

7b419fe

allozaur added 5 commits June 28, 2026 13:15

refactor: Extract MCP prompt ID prefix enum and utility functions

b332961

refactor: Replace inline prompt ID logic with utility functions in co…

bfaa586

…mponents

refactor: Centralize tools submenu open state and fix mounting race c…

5fd30e5

…ondition

refactor: Chat Form Placeholders

ae95323

feat: Update greeting

f9d2eba

allozaur force-pushed the feat/custom-instructions branch from 6c1629a to f9d2eba Compare June 28, 2026 11:15

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ui: Custom Prompts library + improvements for System Message, MCP Prompts & Resources UI/UX#25034

ui: Custom Prompts library + improvements for System Message, MCP Prompts & Resources UI/UX#25034
allozaur wants to merge 27 commits into
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allozaur commented Jun 26, 2026

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allozaur commented Jun 26, 2026

Overview

Demo

Prompts library (/prompts)

System messages

MCP

UI primitives (new building blocks for future features)

Requirements

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engrtipusultan commented Jun 26, 2026

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allozaur Jun 26, 2026

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awijshoff commented Jun 26, 2026

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allozaur commented Jun 26, 2026

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Prompts library (`/prompts`)