How to connect Square to Claude Code

1. 1. Enable Square in Metorial

   In your Metorial portal, enable the Square 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 Square tools.

• Get Catalog Object: Retrieve a specific catalog object by its ID.
• Upsert Catalog Object: Create or fully replace a catalog object (item, variation, category, tax, discount, modifier list, etc.).
• Update Customer: Update an existing customer profile.
• Create Payment: Charge a token or saved card, or record cash or an external payment.
• Create Order: Create an OPEN or DRAFT order at a Square location.
• Get Inventory Counts: Retrieve current inventory counts, optionally filtered by item variations, locations, tracked states, or update time.
• Get Invoice: Get an invoice by ID, including its current version, payment schedule, recipient, status, and customer payment URL when published.
• Create Invoice: Create a draft invoice for an existing order.
• Delete Customer: Permanently delete a customer profile from the Square account.
• Adjust Inventory: Apply physical counts or inventory adjustments to item variations.
• Search Catalog: Search Square catalog items by text or category, or search catalog objects by type and advanced query.
• List Payments: List payments with documented date, location, card, amount, and offline filters.
• Search Orders: Search for orders across one or more locations.
• Get Customer: Retrieve full details of a specific customer profile by ID.
• List Invoices: List invoices at one location with status, version, recipient, payment requests, and public URL when available.
• And 37 more on the Square MCP server page.

• Square 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 Square 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.