Capacities MCP server for AI agents

The Capacities MCP server provides seamless integration between Claude and Capacities, enabling you to interact with your knowledge management system directly through Claude. This server lets you access spaces, search content, save weblinks, and manage your daily notes without leaving the Claude interface.

Installation for Claude Desktop

To install the Capacities MCP server for Claude Desktop:

Add the server to your Claude Desktop configuration file located at ~/Library/Application Support/Claude/claude_desktop_config.json on macOS:

{
  "mcpServers": {
    "capacities": {
      "command": "npx",
      "args": ["-y", "capacities-mcp"],
      "env": {
        "CAPACITIES_API_KEY": "your_capacities_api_key_here"
      }
    }
  }
}

Replace your_capacities_api_key_here with your actual API key from your Capacities account settings.

That's it! The server will automatically download and start when Claude Desktop launches.

Available Tools and Usage

List Spaces

Get a list of all your personal spaces.

Example prompts:

"Show me all my Capacities spaces"
"What spaces do I have in Capacities?"

Get Space Information

Retrieve detailed information about a specific space.

Example prompts:

"Get detailed information about my main workspace in Capacities"
"What structures and collections are in my [space name] space?"

Search Content

Search for content across your spaces with advanced filtering options.

Parameters:

searchTerm: Text to search for
spaceIds: Array of space UUIDs to search in
mode (optional): "fullText" or "title" search mode
filterStructureIds (optional): Filter by specific structure types

Example prompts:

"Search for 'project management' across all my Capacities spaces"
"Find all notes mentioning 'machine learning' in my research space"
"Search for 'meeting notes' but only check titles, not full content"

Save Weblinks

Save URLs to your spaces with metadata.

Parameters:

spaceId: UUID of the target space
url: The URL to save
titleOverwrite (optional): Custom title for the link
descriptionOverwrite (optional): Description text
tags (optional): Array of tags
mdText (optional): Markdown text for the notes section

Example prompts:

"Save this article to my research space: https://example.com/article"
"Bookmark this GitHub repo in my coding space with tags 'javascript' and 'tools'"
"Save this link with a custom title and description to my resources space"

Save to Daily Notes

Add markdown content to today's daily note in a space.

Parameters:

spaceId: UUID of the target space
mdText: Markdown content to add
origin (optional): Origin label
noTimestamp (optional): If true, no timestamp will be added

Example prompts:

"Add a summary of today's key insights to my daily note"
"Save these meeting notes to today's daily note in my work space"
"Add this quote to my daily note: [your quote here]"

Rate Limits

Be aware of the following API rate limits:

/spaces: 5 requests per 60 seconds
/space-info: 5 requests per 60 seconds
/search: 120 requests per 60 seconds
/save-weblink: 10 requests per 60 seconds
/save-to-daily-note: 5 requests per 60 seconds

Advanced Usage Examples

You can combine multiple operations for more complex workflows:

"Search for 'productivity' in my work and personal spaces, but filter to only show task-related structures"
"Save this research paper to my academic space and add it to today's daily note as well"
"Find all my notes about 'AI tools' and then save the best ones as bookmarks"

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "capacities" '{"command":"npx","args":["-y","capacities-mcp"],"env":{"CAPACITIES_API_KEY":"your_capacities_api_key_here"}}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "capacities": {
            "command": "npx",
            "args": [
                "-y",
                "capacities-mcp"
            ],
            "env": {
                "CAPACITIES_API_KEY": "your_capacities_api_key_here"
            }
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json
Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "capacities": {
            "command": "npx",
            "args": [
                "-y",
                "capacities-mcp"
            ],
            "env": {
                "CAPACITIES_API_KEY": "your_capacities_api_key_here"
            }
        }
    }
}

3. Restart Claude Desktop for the changes to take effect