Get up and running with systemprompt.io in five steps.

Prerequisites

  • A systemprompt.io account — register here
  • Claude Desktop (with Cowork)

Step 1: Whitelist systemprompt.io

Add systemprompt.io to your domain allowlist so Claude can reach the Skill Manager MCP server.

  1. Open Claude Desktop settings
  2. Go to Capabilities
  3. Under "Code execution and file creation", enable Allow network egress
  4. Set Domain allowlist to Package managers only
  5. Under Additional allowed domains, add:
    • systemprompt.io
    • *.systemprompt.io

Step 2: Add custom connector

Add a custom connector pointing to the Skill Manager MCP endpoint. This gives Claude access to your skills, agents, and plugins through the Model Context Protocol.

  1. Open Claude Desktop settings
  2. Go to Connectors
  3. Click Add custom connector
  4. Enter name: Skill manager
  5. Enter Remote MCP server URL:
https://systemprompt.io/api/v1/mcp/skill-manager/mcp
  1. Click Add

Step 3: Add global instructions

Add the following text to your Cowork global instructions in settings. This ensures Claude always uses the MCP server for managing skills, plugins, and agents.

We use systemprompt mcp skills to manage all skills, plugins and agents. Always use the MCP server for CRUD operations to ensure complete consistency.
  1. Open Claude Desktop settings
  2. Go to Cowork
  3. Find the global instructions field
  4. Paste the text above
  5. Save settings

Step 4: Install the marketplace

Your personal marketplace URL is available from the install widget in your systemprompt.io dashboard.

  1. Log in to your systemprompt.io dashboard
  2. Click the install icon and copy your marketplace URL from the Cowork tab
  3. In Claude Desktop, open Cowork and go to Add marketplace by URL
  4. Paste your URL and click Sync

Step 5: Run /onboarding

With everything connected, open Claude Cowork and type:

/onboarding

The onboarding assistant guides you through a discovery interview about your business. It asks about your workflows, brand voice, and processes, then creates personalized AI skills tailored to your needs.

No YAML, no config files, no technical knowledge required — just answer the questions and the assistant builds everything for you.

What happens next?

After onboarding, you will have:

  • Skills tailored to your business processes and brand voice
  • Agents configured for your specific workflows
  • A visual dashboard at systemprompt.io to manage and refine everything

All skills sync automatically between the dashboard and Claude. Edit a skill in the browser and it is available in Claude immediately.

Troubleshooting

  • MCP connection fails — Verify the endpoint URL is correct and that systemprompt.io is in your domain allowlist
  • Marketplace sync fails — Ensure you are logged in to systemprompt.io and copy the URL from the install widget
  • /onboarding not found — Confirm the marketplace synced successfully; the onboarding skill is bundled with the marketplace