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This guide covers Mistral LeChat setup. For other AI clients, see our client compatibility guide.

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Prerequisites

Before you begin, make sure you have:

Mistral LeChat

Access to Mistral LeChat at chat.mistral.ai

Civic Account

Create a free account on nexus.civic.com

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Step 1: Copy the MCP URL

1

Visit nexus.civic.com

Open nexus.civic.com in your browser and sign in with your Civic account.Civic Nexus homepage
2

Browse available MCP servers

Explore the directory of available MCP servers. Each server connects to a different service or tool.
Popular servers include Slack, GitHub, Dropbox, and Notion. Click on any server to see what it can do.
3

Select servers to connect

Click the checkbox next to each MCP server you want to use. You can select multiple servers.
Some servers may require authentication with the service they connect to. Make sure you have access to accounts for the services you select.
4

Copy the MCP URL

After selecting servers, copy this URL:
https://nexus.civic.com/hub/mcp

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Step 2: Add Connector to LeChat

1

Open LeChat Intelligence settings

In LeChat:
  1. Look at the left-hand sidebar
  2. Click on the “Intelligence” tab
  3. This will open the Intelligence settings panel
LeChat showing Intelligence tab in left sidebar

Navigate to LeChat Intelligence settings

2

Access Connectors section

  1. In the Intelligence panel, click on “Connectors”
  2. This will show your existing connectors and options to add new ones
LeChat Connectors section in Intelligence settings

LeChat Connectors section

3

Add Custom MCP connector

  1. Click “Add Connector” button
  2. Select “Custom MCP” from the connector types
  3. Enter the following information:
    • Name: “Civic Nexus”
    • MCP URL: https://nexus.civic.com/hub/mcp
    • Description (optional): “Access hundreds of tools via Civic Nexus”
  4. Click “Connect” to save the connector
LeChat Custom MCP connector dialog

Add custom MCP connector in LeChat

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Step 3: Authenticate and Test

1

Complete authentication

When you first use an MCP server that requires authentication:
  1. LeChat will prompt you to connect to the service
  2. A browser window will open for OAuth authentication
  3. Sign in to the service and authorize access
  4. Return to LeChat when complete
GitHub OAuth authorization screen

OAuth authentication flow (example: GitHub)

Authentication is handled securely by Civic Nexus. Your credentials are never exposed to LeChat or stored locally.
2

Test your connection

Try these simple commands to verify everything is working:
"What MCP servers are available?"
Or test a specific service:
"Can you check my recent GitHub pull requests?"
"What's in my Dropbox?"
LeChat chat showing successful tool usage

LeChat successfully using connected tools

LeChat should now be able to access and interact with your connected services.

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Managing Your MCP Connectors

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Adding More Tools

You can add new tools directly in your LeChat conversation: 
"Connect me to GitHub"
"Add Slack to my available tools"
"I need access to PostgreSQL"
"Show me what tools are available to connect"
LeChat will handle the connection process and guide you through any required authentication steps.

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Viewing Connected Tools

To see your currently connected tools:
  1. Go to Intelligence → Connectors in the left sidebar
  2. View the list of active connectors
  3. You can see connection status and last used time for each

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Removing Tools

You can disconnect from specific tools:
1

Access connector settings

Go to Intelligence → Connectors in LeChat’s left sidebar
2

Remove connector

  1. Find “Civic Nexus” or the specific tool in your connectors list
  2. Click the three dots or settings icon next to the connector
  3. Select “Remove” or “Disconnect”
  4. Confirm the removal when prompted
3

Clean up authorizations (optional)

Visit nexus.civic.com to revoke service authorizations if you no longer want Civic to have access

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Reset Connection

If your connector isn’t working properly:
1

Complete reset

  1. Remove the Civic Nexus connector completely
  2. Refresh the LeChat page
  3. Follow the setup steps above to re-add with a fresh MCP URL from nexus.civic.com

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Common Questions

Check your LeChat plan features. MCP connector support may vary by subscription tier. Visit chat.mistral.ai for plan details.
If you encounter authentication issues:
  • Make sure you’re logged into the correct account for the service
  • Check if your account email matches between nexus.civic.com and the service
  • Try removing and re-adding the MCP connector with a fresh URL
  • Check our troubleshooting guide for more solutions
If your nexus.civic.com account uses a different email than your connected services (e.g., work@company.com vs personal@gmail.com), make sure you authenticate with the correct account for each service during the OAuth flow.
Try these steps:
  • Refresh the LeChat page
  • Remove the connector completely and re-add with a fresh MCP URL
  • Check that your browser allows pop-ups for authentication
  • Clear browser cache and cookies for chat.mistral.ai

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Two-Minute Verification

Once connected, test these prompts to make sure everything works:
  • If you selected GitHub
  • If you selected Slack
  • If you selected Dropbox
"List my GitHub repositories"
"Show me my recent pull requests"
"What issues are assigned to me?"

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Need Help?

Troubleshooting Guide

Solutions for common LeChat connection issues

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Next Steps

Now that you’re connected, explore what you can do:

Browse More Servers

Add more MCP servers to expand LeChat’s capabilities

Security Details

Learn how Nexus keeps your data secure

Client Compatibility

See setup guides for other AI clients

Get Support

Contact us if you need help