Hjarni MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Hjarni MCP or direct API to organize notes, search knowledge bases, manage containers, and maintain tags through natural language.

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Api Key

Hjarni is a personal knowledge management platform for notes, containers, tags, and linked ideas. It helps you keep knowledge organized, searchable, and easier to maintain.

15 Tools

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Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND
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TOOLS

Supported Tools

Every Hjarni action and event your agent gets out of the box.

Create Container

Create a root or nested Hjarni container for organizing notes.

Create Note

Create a Markdown note in the inbox or a container.

Create Notes

Create 1-25 Markdown notes in order and return one result per input.

Create Tag

Create a Hjarni tag for organizing notes.

Get Account Status

Return the connected Hjarni identity, token scope, plan, teams, and current resource usage and quotas.

Get Note

Get one Hjarni note by ID with its Markdown body, tags, container, attachments, links, and optimistic-lock version.

List Containers

List Hjarni containers as active roots, archived roots, or all active containers in a flat view.

List Notes

List and filter personal Hjarni notes, including active, inbox, archived, or favorited notes.

List Tags

List all Hjarni tags and their note counts.

List Trashed Notes

List recoverable trashed Hjarni notes with their deletion and scheduled purge times.

Rename Tag

Rename an existing Hjarni tag without changing its note associations.

Restore Note

Restore a note from Trash before its scheduled purge and return the active note.

Move Note to Trash

Move a note to recoverable Trash.

Update Container

Update a Hjarni container's name, description, parent, position, or container-specific AI instructions.

Update Note

Update note metadata, placement, tags, or body.

SETUP GUIDE

Connect Hjarni MCP Tool with your Agent

1

Install Composio

typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
Install the Composio SDK and your agent framework
2

Create a session with MCP enabled

typescript
import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["hjarni"],
  mcp: true,
});
Create a session scoped to Hjarni and read its MCP URL and headers
3

Connect your agent to the MCP server

typescript
import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Search my Hjarni notes tagged project-alpha and summarize the key decisions",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
Pass the session's MCP URL and headers to your agent and run a Hjarni request
SETUP GUIDE

Connect Hjarni API Tool with your Agent

1

Install Composio

typescript
npm install @composio/core @composio/openai openai
Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
2

Create a Composio session

typescript
import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["hjarni"] });
const tools = await session.tools();
Initialize Composio with the OpenAI Responses provider and create a session scoped to Hjarni
3

Run Hjarni tools with your agent

typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Search my Hjarni notes tagged project-alpha and summarize the key decisions" }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
Send a request, execute the Hjarni tool calls through the session, and print the final answer

Why Use Composio?

AI Native Hjarni Integration

  • Supports both Hjarni MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable note, container, and tag operations
  • Rich coverage for reading, writing, searching, and maintaining your Hjarni knowledge base

Managed Auth

  • Securely connect Hjarni with API key based authentication instead of hard-coding secrets
  • Create Hjarni auth configs with auth_configs.create() and link user accounts with connected_accounts.link()
  • Per user and per environment credentials so each agent gets the right level of Hjarni access

Agent Optimized Design

  • Tools are tuned for natural language workflows like searching notes, tagging content, and organizing containers
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf
  • Works cleanly with MCP sessions created through mcp.create() when you want Hjarni inside agent clients

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access Hjarni
  • Scoped, least privilege access to Hjarni notes, containers, and tags
  • Full audit trail of agent actions to support review and compliance
FAQ

Frequently asked questions

Yes, Hjarni requires you to configure your own API key credentials. Once set up, Composio handles secure credential storage and API request handling for you.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your Hjarni connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

Create the key in your Hjarni account settings, then paste it once on Composio's connection page. Composio stores it encrypted and uses it only for the Hjarni actions your agent runs. Nobody else in your workspace can read it, and you can revoke it inside Hjarni at any time.

When you connect a Hjarni account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in Hjarni as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Whatever the credentials you connect allow inside Hjarni. If Hjarni lets you scope a key to specific permissions, create a scoped one so the agent can only do what you intend. You can revoke the key inside Hjarni at any time.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each Hjarni connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

The connection stops working the moment Hjarni rejects the old key. Create a new key in Hjarni and reconnect the account from the Composio dashboard or by asking your agent to reconnect Hjarni. Nothing else changes.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, which covers most personal Hjarni use. Paid plans add higher limits and team features. Your Hjarni plan and its API limits still apply as usual.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple Hjarni accounts).

With Composio, you connect Hjarni once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

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