Hjarni

Give your AI long-term memory.
Note-taking app with a built-in MCP server.

Website · Docs · Blog

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What it does

Hjarni is an AI-native note-taking app. Write notes in Markdown, organize them in folders with custom AI instructions per folder, and let Claude or ChatGPT search, read, create, and organize your notes via MCP.

Your notes serve two readers: you and your AI. Hjarni stores the knowledge. ChatGPT and Claude are the interfaces.

Connect

Hjarni is a hosted remote MCP server with OAuth authentication. No API keys, no Docker, no local setup. Setup takes under 2 minutes.

Claude.ai / Claude iOS

1. Open Settings > Integrations
2. Tap Add custom connector
3. Set the name to hjarni and the URL to https://hjarni.com/mcp
4. Tap Add and log in to Hjarni when redirected

Requires Claude Pro or Team plan for MCP integrations.

Claude Desktop / Claude Code

Add to your MCP config (claude_desktop_config.json or .claude.json):

{
  "mcpServers": {
    "hjarni": {
      "url": "https://hjarni.com/mcp",
      "type": "streamable-http"
    }
  }
}

Works on any Claude plan. Authenticates via OAuth on first connection.

ChatGPT

1. Go to chatgpt.com > Settings > Connectors
2. Enable Developer mode
3. Tap Create app
4. Set the name to hjarni and the MCP Server URL to https://hjarni.com/mcp
5. Set authentication to OAuth
6. Tap Create and log in to Hjarni when redirected

Requires ChatGPT Plus, Pro, or Team plan.

Other MCP clients

Any client that supports streamable HTTP transport can connect. The endpoint is https://hjarni.com/mcp. Authentication uses OAuth 2.0 with PKCE. Discovery metadata is at /.well-known/oauth-authorization-server.

Available tools

Tool	Description
search	Full-text search across notes, containers, and tags
notes-create	Create a new note with title, body, tags, and container placement
notes-get	Read a single note including full content, tags, and linked notes
notes-list	List notes with filtering by container, tags, and sorting
notes-update	Update content, move notes, change tags, archive/unarchive
notes-delete	Permanently delete a note
containers-list	List folders for organizing notes
containers-create	Create new folders
containers-get	Get a single container with its AI instructions
containers-update	Update a container (rename, move, change description)
tags-list	List all tags
tags-create	Create new tags
links-manage	Create or remove bidirectional links between notes
instructions-get	Read AI instructions set on a folder
instructions-update	Update folder-level AI instructions
files-attach	Attach a file to a note
files-attach_from_url	Fetch a file from a URL and attach it to a note
files-get_download_url	Get a temporary download URL for a file
files-remove	Remove a file attachment
dashboard-get	Overview of the account: note count, containers, tags, inbox
teams-list	List all teams the user is a member of
teams-get	Get team details including recent notes

Built-in prompts

The server also exposes MCP prompts for clients that support prompt discovery:

Prompt	Description
summarize_note	Summarize a note and suggest tags and related links
weekly_review	Review recent activity and suggest organization improvements
research_topic	Synthesize everything in the knowledge base related to a topic

Usage examples

Research assistant

"What decisions have I made about the tech stack?"

Claude searches your notes, follows wiki-links between related notes, and synthesizes a summary from multiple sources.

Quick capture

"Save this as a note in my Projects folder and tag it"

Claude finds the right container, creates the note with Markdown formatting, adds tags, and links it to related notes.

Weekly review

"Help me triage my inbox"

Claude lists unfiled notes, suggests where each belongs based on your folder structure, and moves them with your approval.

Writing with context

"Draft a project update using my recent meeting notes"

Claude pulls relevant notes and uses them as source material.

Features

• Markdown notes with full formatting support
• Wiki-links ([[id:Note Title]]) for cross-referencing
• Folders with custom AI instructions per folder
• Full-text search across all content
• Bidirectional linking between notes
• Tags for cross-cutting categorization
• File attachments (Pro plan and above)
• Team collaboration with shared knowledge bases
• REST API for custom integrations
• Export your data as Markdown at any time

MCP server details

Endpoint	https://hjarni.com/mcp
Transport	Streamable HTTP with JSON-RPC 2.0
Protocol versions	2025-03-26 and 2024-11-05
Authentication	OAuth 2.0 (PKCE) or Bearer token
Capabilities	Tools and prompts

For the full protocol reference, see the MCP server docs.

Pricing

Plan	Price	What you get
Free	$0	25 notes, containers, tags, search, full MCP & API access
Pro	$10/mo	Unlimited notes, file attachments, share with 2 collaborators
Teams	$13/seat/mo	Shared knowledge base, team MCP & API, member management

Also available in EUR and GBP. See pricing.

Links

• Website
• Docs
• Getting started
• MCP server reference
• REST API reference
• Claude setup guide
• ChatGPT setup guide
• Blog
• Privacy
• Terms

Support

Email [email protected].

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