Obsidian

Obsidian is a knowledge-management and note-taking app built on local Markdown files, commonly used to build a personal knowledge base, bidirectionally linked notes, and a "second brain." With community plugins, you can call the Claude API directly inside your notes for AI writing, content organization, knowledge-base Q&A, and code generation.

This page covers two popular plugins for connecting to the LMU AI API — pick whichever one fits your needs:

Prerequisite: enable community plugins

Both plugins are community plugins, so you need to enable the community-plugins feature before installing them.

Open Obsidian → the top-left menu Obsidian → Settings (or the shortcut Cmd/Ctrl + ,), go to Community plugins, and click Turn on community plugins:

Once enabled, click the Browse button on the right of the Community plugins page to open the plugin marketplace:

Claudian plugin: use the Claude API in Obsidian

Claudian embeds AI coding agents like Claude Code and Codex into the Obsidian sidebar. Your entire vault becomes the agent's working directory, with support for file read/write, search, @mention, slash commands, and more.

Claudian's Claude mode calls the Claude Code CLI under the hood, so install that command-line tool first, then connect to the LMU AI API using either method below.

Step 1 — Install the Claude Code CLI

Claudian calls the local claude command, so you need to install the Claude Code CLI first: after installing Node.js, run npm install -g @anthropic-ai/claude-code (for detailed steps, see the Claude Code CLI configuration guide).

Step 2 — Install the Claudian plugin

In the plugin marketplace (Browse), search for Claudian, click Install, and then click Enable once installation finishes.

Step 3 — Configure the LMU AI API (pick one)

Go to the Settings → Claudian → Claude tab and enter the LMU AI Base URL and key using either of the methods below.

{
  "env": {
    "ANTHROPIC_BASE_URL": "https://api.lmuai.com",
    "ANTHROPIC_AUTH_TOKEN": "sk-your-lmu-ai-api-key",
    "API_TIMEOUT_MS": "3000000",
    "CLAUDE_CODE_ATTRIBUTION_HEADER": "0"
  }
}

ANTHROPIC_BASE_URL: https://api.lmuai.com
ANTHROPIC_AUTH_TOKEN: sk-your-lmu-ai-api-key
ANTHROPIC_MODEL: claude-haiku-4-5
CLAUDE_CODE_USE_BEDROCK=1
CLAUDE_CODE_ATTRIBUTION_HEADER: 0

Other optional settings:

Step 4 — Start using it

Click the Claudian icon in the left sidebar (or use the command palette) to open the chat sidebar; pick a model at the bottom, and you can chat with the AI next to your notes and have it read and write documents in your vault:

Copilot plugin: use the Claude API in Obsidian

Copilot is the most popular AI assistant plugin for Obsidian, supporting chat, knowledge-base Q&A, note summarization, and more. It lets you add custom models and connects directly to the LMU AI API without installing any command-line tool.

Step 1 — Install the Copilot plugin

In the plugin marketplace (Browse), search for Copilot and choose the Copilot by Logan Yang (the first result), then click Install and Enable:

Step 2 — Add a custom model

Go to the Settings → Copilot → Model tab and click + Add Model in the top-right corner:

Fill in the following in the Add Custom Chat Model dialog:

When done, click Test to verify; a green checkmark means the connection succeeded, then click Add Model to save:

Step 3 — Add an OpenAI model (optional)

To use GPT-series models, click + Add Model again, change Provider to OpenAI, and fill in the rest the same way:

Step 4 — Select a model and start using it

Open the Copilot chat panel, pick the model you just added from the model dropdown at the top, and you can start chatting and asking questions about your notes.

Common issues

401 / Unauthorized error

The API key is wrong, or requests are still going to the official endpoint. Please confirm:

• Claudian: check that the ANTHROPIC_AUTH_TOKEN you entered in Step 3 is your LMU AI key; for Method A, also confirm it isn't overridden by a shell environment variable (see Claude Code common issues for how to check)
• Copilot: the Base URL is https://api.lmuai.com and the API Key is your LMU AI sk- key, not an official Anthropic / OpenAI key

CORS error when adding a model in Copilot

In the Add Custom Chat Model dialog, check the CORS option before clicking Test to bypass the browser's cross-origin restriction.

Claudian reports Claude CLI not found

The plugin could not locate Claude Code automatically. Run which claude in your terminal (use where claude on Windows) and paste the path it outputs into Settings → Claudian → Claude → Claude CLI path.

Response timeouts or dropped streams

• Make sure API_TIMEOUT_MS is set to 3000000 to avoid timeouts on long tasks
• Turn off any VPN / proxy / system proxy — LMU AI is a direct domestic connection, and a direct connection is the fastest and most stable

Last updated: 2026-08-26