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How to integrate Square MCP with Hermes

Connect Hermes to Square MCP. Create and send an invoice to a customer, list all recent payments from last week, and more using natural language, with authentication handled for you.

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Square is a platform for payment processing, POS, invoicing, and e-commerce. It empowers businesses to accept payments, manage sales, and streamline operations from one place.

122 Tools

Introduction

Hermes is a 24/7 autonomous agent that lives on your computer or server — it remembers what it learns and evolves as your usage grows.

This guide explains the easiest and most robust way to connect your Square account to Hermes. You can do this through either Composio Connect CLI or Composio Connect MCP. For personal use we recommend the CLI, but you won't go wrong with MCP either.

Also integrate Square with

Claude CodeClaude CoworkOpenAI Agents SDKClaude Agent SDKCodexKimi CodeOpenClawAtomic AgentCLIGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

What is Composio Connect?

Composio Connect is a consumer offering that lets anyone plug 1,500+ applications directly into their agent harness — including Hermes. It can:

  • Search and load tools from relevant toolkits on-demand, reducing context usage.
  • Chain multiple tools to accomplish complex workflows via a remote workbench, without excessive back-and-forth with the LLM.
  • Manage app authentication end-to-end with zero manual overhead.

Integrating Square with Hermes

Using Composio Connect CLI

1. Install the Composio CLI

Run the install script directly, or paste https://composio.dev/hermes into your Hermes chat box to have it installed for you.

bash
curl -fsSL https://composio.dev/install | bash
Hermes authenticating with Composio

2. Authenticate

Once the CLI is installed, ask Hermes to authenticate with Composio.

3. Connect to Square

Ask your agent to connect to Square, or simply request any Square-related task. Hermes will prompt you to authenticate and authorize access.

4. Done. You're all set with a new Square connection.

Using Composio Connect MCP

1. Get your MCP URL and API Key

Go to dashboard.composio.dev and copy your Connect MCP URL and API key.

Copy MCP URL and API key from Composio dashboard

2. Open the Hermes config file

bash
nano ~/.hermes/config.yaml

3. Add the Composio Connect MCP server

bash
mcp_servers:
  composio:
    url: "https://connect.composio.dev/mcp"
    headers:
      x-consumer-api-key: "YOUR_COMPOSIO_API_KEY"
    connect_timeout: 60
    timeout: 180

Save with Ctrl + O, Enter, then exit with Ctrl + X.

4. Restart your Hermes agent

Once restarted, ask your agent to connect to Square or request any Square-related task. It will prompt you to authenticate and authorize access.

5. Done!

What is the Square MCP server, and what's possible with it?

The Square MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Square account. It provides structured and secure access to your Square business tools, so your agent can perform actions like processing payments, managing invoices, tracking orders, handling customers, and managing inventory on your behalf.

  • Seamless payment processing: Let your agent accept card payments, issue refunds, and manage transactions across your business locations.
  • Automated invoice creation and management: Ask your agent to generate, send, and monitor invoices for your customers, streamlining your billing process.
  • Order and fulfillment tracking: Enable your agent to view, update, and manage orders, helping you keep tabs on fulfillment and delivery status with ease.
  • Customer profile management: Have your agent create, update, or search customer profiles, making it easier to personalize service and maintain up-to-date records.
  • Inventory and item catalog control: Allow your agent to track stock levels, update item details, and organize your catalog for smooth retail operations.

Way Forward

With Square connected, Hermes can now act on your behalf whenever it detects a relevant task or you ask it to.

From here, you can extend Hermes further:

  • Connect more apps: Calendar, Slack, Notion, Linear, and hundreds of others are available through the same Composio Connect setup. Each new integration compounds what Hermes can do for you.
  • Build workflows across tools: Once multiple apps are connected, Hermes can chain actions together — turn an email into a calendar invite, a Slack message into a Linear ticket, or a meeting note into a follow-up draft.
  • Let it learn your patterns: The more you use Hermes, the better it gets at anticipating how you'd handle recurring tasks. Give it feedback on drafts and decisions, and it will adapt.

If you run into trouble or want to share what you've built, join the community or check out the Docs for deeper configuration options.

TOOLS

Supported Tools

Every Square action and event your agent gets out of the box.

Accept Dispute

Accept a dispute and acknowledge liability, returning funds to the cardholder.

Add Group to Customer

Tool to add a customer to a customer group.

Calculate Order

Tool to preview order pricing without creating an order.

Cancel Booking

Cancels an existing Square booking, terminating the reservation.

Cancel Invoice

Cancels a Square invoice, preventing further payments from being collected.

Cancel Payment

Cancels (voids) a payment that is in APPROVED status.

Batch Create Inventory Changes

Applies multiple inventory adjustments and physical counts in a single batch request.

Create Bulk Customers

Tool to create multiple customer profiles in a single request.

Create Card

Tool to create a card on file.

Create Customer

Tool to create a new customer profile in Square.

Create Customer Custom Attribute Definition

Tool to create a customer-related custom attribute definition.

Create Customer Group

Tool to create a new customer group for a business.

Create Dispute Evidence File

Tool to upload a file as dispute evidence.

Create Dispute Evidence Text

Upload text evidence for a dispute challenge.

Create Gift Card Activity

Creates a gift card activity to manage gift card balances.

Create Invoice Attachment

Upload and attach a file to a Square invoice.

Create Location

Tool to create a new business location in a Square account.

Create Location Custom Attribute Definition

Tool to create a location-related custom attribute definition.

Create Order

Creates a new Square order with line items, taxes, discounts, and fulfillment details.

Create Refund

Refunds a Square payment in full or partially.

Create Team Member

Tool to create a new team member in Square.

Delete Catalog Object

Tool to delete a Square catalog object by ID.

Delete Catalog Objects (Batch)

Deletes a set of CatalogObjects based on a list of target object IDs and returns a set of successfully deleted IDs in the response.

Delete Customer

Tool to delete a Square customer profile.

Delete Customer Custom Attribute

Tool to delete a custom attribute from a customer profile.

Delete Customer Custom Attribute Definition

Tool to delete a customer-related custom attribute definition.

Delete Customer Group

Tool to delete a customer group by its ID.

Bulk Delete Customers

Tool to bulk delete customer profiles from Square.

Delete Dispute Evidence

Removes a specific piece of evidence from a dispute.

Delete Invoice

Tool to delete a Square invoice (only DRAFT invoices can be deleted).

Delete Invoice Attachment

Tool to delete an attachment from a Square invoice.

Delete Location Custom Attribute

Tool to delete a custom attribute from a location.

Delete Location Custom Attribute Definition

Tool to delete a location-related custom attribute definition.

Delete Locations Custom Attributes (Batch)

Tool to delete custom attributes from multiple locations in a single batch request.

Delete Merchant Custom Attribute

Tool to delete a custom attribute from a merchant profile.

Delete Merchant Custom Attribute Definition

Tool to delete a merchant-related custom attribute definition.

Delete Merchants Custom Attributes (Batch)

Tool to delete custom attributes from multiple merchants in a single batch request.

Delete Webhook Subscription

Permanently deletes a webhook subscription by its ID.

Get Booking

Retrieves detailed information about a specific Square booking by its ID.

Get Business Booking Profile

Tool to retrieve the business booking profile for a Square merchant via GraphQL.

Get Current Merchant

Tool to retrieve merchant information associated with the access token using Square's GraphQL API.

Get Customer Custom Attribute

Retrieves a custom attribute from a customer profile in Square.

Get Customer Custom Attribute Definition

Tool to retrieve a customer-related custom attribute definition from Square.

Get Customers via GraphQL

Tool to retrieve customer profiles from Square Customer Directory using GraphQL API.

Get Dispute Evidence

Retrieves detailed information about a specific piece of evidence that was uploaded for a dispute.

Get Gift Card From GAN

Retrieves detailed information about a gift card by its GAN (gift card account number).

Get Invoice

Retrieves detailed information about a specific Square invoice by its ID.

Get Loyalty Account

Tool to retrieve detailed information about a specific Square loyalty account by ID.

Get Merchant

Tool to retrieve detailed information about a specific Square merchant by ID.

Get Online Checkout Location Settings

Tool to retrieve location-level settings for Square online checkout.

Get Payment Refund

Retrieves a specific payment refund by its unique ID from Square.

Get Subscription

Retrieves detailed information about a specific Square customer subscription by its ID.

Get Team Member

Tool to retrieve detailed information about a specific Square team member by ID.

Link Customer to Gift Card

Tool to link a customer to a gift card in Square.

List Cards

Tool to retrieve cards on file associated with a Square account.

List Channels

Tool to list requested channels from Square.

List Customer Custom Attribute Definitions

Tool to list customer-related custom attribute definitions from Square.

List Customer Custom Attribute Definitions (GraphQL)

Tool to retrieve customer custom attribute definitions via Square's GraphQL API.

List Customer Custom Attributes

Tool to list custom attributes for a customer profile.

List Customer Groups

Tool to retrieve the list of customer groups of a business.

List Customers

Tool to retrieve customer profiles associated with a Square account.

List Customer Segments

Tool to retrieve the list of customer segments of a business.

List Dispute Evidence

Tool to list evidence items associated with a given dispute.

List Invoices

Tool to list invoices for a Square location.

List Location Custom Attribute Definitions

Tool to list location-related custom attribute definitions from Square.

List Locations

Tool to retrieve all business locations from a Square account.

List Locations Custom Attributes

Tool to list custom attributes for a specific location in Square.

List Merchant Custom Attribute Definitions

Tool to list merchant-related custom attribute definitions from Square.

List Merchants

Tool to retrieve merchant account information associated with the access token.

List Merchants Custom Attributes

Tool to list custom attributes for a specific merchant in Square.

List Payments

Tool to list payments by location and time range to enable reconciliation and net sales reporting from Square POS.

List Subscriptions

Tool to search and list Square customer billing subscriptions.

List Webhook Event Types

Tool to list available webhook event types.

List Webhook Subscriptions

List all webhook subscriptions owned by your application.

Pay Order

Pays an existing Square order by processing approved payments and completing the transaction.

Remove Group From Customer

Removes a customer from a customer group.

Retrieve Bulk Customers

Tool to retrieve multiple customer profiles in a single request.

Retrieve Channel

Retrieve a Square channel by its ID.

Bulk Retrieve Channels

Tool to bulk retrieve multiple Square channels by their IDs in a single request.

Retrieve Customer

Tool to retrieve detailed information about a specific Square customer by ID.

Retrieve Customer Group

Tool to retrieve a specific Square customer group by ID.

Retrieve Customer Segment

Tool to retrieve a specific customer segment by its ID.

Retrieve Dispute

Tool to retrieve a Square dispute by ID.

Retrieve Inventory Changes

Retrieves the inventory change history for a catalog object at specified locations.

Batch Retrieve Inventory Counts

Retrieve inventory counts for multiple catalog objects and locations in a single batch request.

Retrieve Location

Tool to retrieve detailed information about a specific Square location by ID.

Retrieve Location Custom Attribute

Retrieves a custom attribute associated with a location in Square.

Retrieve Location Custom Attribute Definition

Tool to retrieve a location-related custom attribute definition.

Retrieve Merchant Custom Attribute

Retrieves a custom attribute associated with a merchant in Square.

Retrieve Merchant Custom Attribute Definition

Tool to retrieve a merchant-related custom attribute definition from Square.

Retrieve Merchants

Tool to retrieve merchant information including status, main location details, and capabilities using Square's GraphQL API.

Retrieve Order

Retrieves detailed information about a specific Square order by its ID.

Retrieve Payment Link

Retrieves a Square-hosted payment link by ID.

Retrieve Token Status

Tool to retrieve information about an OAuth access token or personal access token.

Retrieve Webhook Subscription

Retrieve a Square webhook subscription by its ID.

Search Booking Availability

Searches for available appointment time slots for booking services at Square locations.

Search Catalog Objects

Searches for catalog objects (items, categories, taxes, discounts, etc.

Search Customers

Tool to search customer profiles in Square Customer Directory.

Search Orders

Tool to search orders across one or more Square locations with filters.

Submit Dispute Evidence

Submits evidence for a dispute to the cardholder's bank.

Test Webhook Subscription

Tests a webhook subscription by sending a test event to the configured notification URL.

Update Booking

Updates an existing Square booking with new appointment details, times, notes, or team members.

Update Customer

Tool to update an existing Square customer profile.

Update Customer Custom Attribute Definition

Tool to update a customer-related custom attribute definition in Square.

Update Customer Group

Tool to update a customer group's information by its ID.

Bulk Update Customers

Tool to update multiple customer profiles in a single batch operation.

Update Location

Tool to update an existing business location in a Square account.

Update Location Custom Attribute Definition

Tool to update a location-related custom attribute definition in Square.

Update Merchant Custom Attribute Definition

Tool to update a merchant-related custom attribute definition in Square.

Update Online Checkout Location Settings

Tool to update location-level settings for Square online checkout.

Update Order

Updates an existing Square order by adding, modifying, or removing fields.

Update Team Member

Tool to update an existing Square team member's information.

Update Webhook Subscription

Tool to update a Square webhook subscription.

Update Webhook Subscription Signature Key

Tool to rotate the signature key for a webhook subscription.

Upsert Catalog Object

Creates or updates a catalog object in the Square catalog.

Batch Upsert Catalog Objects

Creates or updates multiple catalog objects in a single batch operation.

Upsert Customer Custom Attribute

Tool to create or update a custom attribute for a customer profile.

Batch Upsert Customer Custom Attributes

Tool to create or update custom attributes for multiple customers in a single batch request.

Upsert Location Custom Attribute

Tool to create or update a custom attribute for a location.

Batch Upsert Locations Custom Attributes

Tool to create or update custom attributes for multiple locations in a single batch request.

Upsert Merchant Custom Attribute

Tool to create or update a custom attribute for a merchant profile.

Batch Upsert Merchants Custom Attributes

Tool to create or update custom attributes for multiple merchants in a single batch request.

FRAMEWORKS

How to build Square MCP Agent with another framework

Claude Code logo

Claude Code

Use Square MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Square MCP with Claude Cowork

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Square MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Square MCP with Claude Agent SDK

Codex logo

Codex

Use Square MCP with Codex

Kimi Code logo

Kimi Code

Use Square MCP with Kimi Code

OpenClaw logo

OpenClaw

Use Square MCP with OpenClaw

Atomic Agent logo

Atomic Agent

Use Square MCP with Atomic Agent

CLI logo

CLI

Use Square MCP with CLI

Google ADK logo

Google ADK

Use Square MCP with Google ADK

LangChain logo

LangChain

Use Square MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Square MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Square MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Square MCP with LlamaIndex

CrewAI logo

CrewAI

Use Square MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Square MCP with Pydantic AI

AutoGen logo

AutoGen

Use Square MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Square MCP server, the agents and LLMs can only access a fixed set of Square tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Square and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Hermes fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Square tools.

Yes, absolutely. You can configure which Square scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Square data and credentials are handled as safely as possible.

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