How to connect Trello to Claude Code

1. 1. Enable Trello in Metorial

   In your Metorial portal, enable the Trello MCP server and sign in with the account that owns the data. Access stays governed by your team policies.

2. 2. Add the server over HTTP

   Add --scope user to use it in every project.

   Copy

   claude mcp add --transport http metorial <your-magic-mcp-url>

3. 3. Sign in

   Run /mcp, select Metorial and sign in to load Trello tools.

• Add Comment: Add a comment to a Trello card.
• Get Boards: List all boards accessible to the authenticated user, or boards belonging to a specific member or workspace.
• Manage Checklist: Create, delete checklists on cards, and add, update, or remove checklist items.
• Add Attachment: Add a URL attachment to a Trello card.
• Manage Board: Create, update, or delete a Trello board.
• Get Lists: Get all lists on a Trello board.
• Manage Card Members: Add or remove member assignments on a Trello card.
• Get Card: Get detailed information about a single Trello card, including its description, members, attachments, due dates, and labels.
• Manage List: Create, update, or archive a list on a Trello board.
• Get Board Members: List all members of a Trello board.
• Get Cards: Get cards from a specific list or an entire board.
• Search: Search across Trello boards and cards.
• Get Activity: Retrieve the activity log (actions) for a board or card.
• Manage Labels: Get, create, update, or delete labels on a Trello board.
• Manage Card: Create, update, move, or delete a Trello card.
• And 5 more on the Trello MCP server page.

• Trello tools appear as mcp__metorial__<tool>. Use that name in permission rules to allow or deny a tool.
• Run /mcp to see whether Metorial is connected and to sign in again.
• Claude Code warns when a tool result passes 10,000 tokens and caps it at 25,000 by default. Raise the cap with MAX_MCP_OUTPUT_TOKENS.
• Pre-approve trusted Trello tools with allow rules in your settings so Claude Code stops asking each time.

claude mcp list shows "Needs authentication"

Run /mcp, select Metorial, and sign in. If sign-in keeps failing, choose Clear authentication in the same menu and sign in again.

A teammate sees "Pending approval"

Servers shared through a project .mcp.json need approval. Run claude in the project and approve Metorial when asked.

Large tool results are cut off

Claude Code limits MCP tool output to 25,000 tokens by default. Raise it with the MAX_MCP_OUTPUT_TOKENS environment variable.

Based on the Claude Code MCP documentation.