How to integrate Sevdesk MCP with Codex

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Introduction

Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With Sevdesk MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.

Also integrate Sevdesk with

Why use Composio?

Apart from a managed and hosted MCP server, you will get:

  • CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
  • Large tool responses: Handle them to minimise context rot.
  • Dynamic just-in-time access to 20,000 tools across 1000+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.

How to install Sevdesk MCP in Codex

Run the setup command

Run this command in your terminal to add the Composio MCP server to Codex.

Terminal

It will initiate the authentication in a browser window, authorize Codex to access your Composio account.

Composio authentication page

(Optional) Authenticate with OAuth

To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.

bash
codex mcp login composio

Verify the connection

Run codex mcp list to confirm Composio appears as a registered MCP server.

bash
codex mcp list

Codex App

Codex App follows the same approach as VS Code.

  1. Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
  2. Fill the header and Key fields with { "x-consumer-api-key" = "ck_*******" }.
  3. The Key is the Composio API key, that you can find on dashboard.composio.dev
  4. Click on Authenticate and authorize Codex to your Composio account and you're all set.
Codex App MCP setup
  1. Restart and verify if it's there in .codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }

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

The Sevdesk MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Sevdesk account. It provides structured and secure access to your accounting workspace, so your agent can perform actions like managing invoices, tracking expenses, generating reports, organizing contacts, and handling payments on your behalf.

  • Invoice creation and management: Instantly generate, send, and track invoices for your clients, keeping your business cash flow streamlined.
  • Expense tracking and categorization: Let your agent record and organize expenses, ensuring your books are always up to date and categorized for tax time.
  • Financial reporting and insights: Request detailed reports and summaries—like profit and loss or balance sheets—so you can make informed business decisions quickly.
  • Contact and customer management: Effortlessly add, update, or retrieve customer details and supplier information to keep your records accurate.
  • Payment and transaction handling: Enable your agent to log payments, match transactions, and help reconcile your accounts, reducing manual entry and errors.

Supported Tools & Triggers

Tools
Book Invoice AmountTool to book an invoice amount in SevDesk.
Check Customer Number AvailabilityTool to check if a customer number is available in sevDesk.
Create Accounting ContactTool to create a new accounting contact in sevDesk.
Create Check Account TransactionTool to create a new check account transaction in SevDesk.
Create Clearing AccountTool to create a new clearing account in sevDesk.
Create Communication WayTool to create a new contact communication way (email, phone, website, etc.
Create ContactCreates a new contact (person or company) in SevDesk accounting system.
Create Contact (REST API)Tool to create a new contact in sevDesk using the standard REST API endpoint.
Create Contact AddressTool to create a new contact address in SevDesk.
Create Contact Custom FieldTool to create a custom field for a contact in sevDesk.
Create Contact Custom Field SettingCreates a new contact custom field setting in sevDesk for tracking additional contact information.
Create Credit Note from InvoiceTool to create a new credit note from an existing invoice in SevDesk.
Create File Import AccountTool to create a new file import account (check account) in sevDesk.
Create PartTool to create a new part (product or service) in SevDesk.
Create Payment MethodCreates a new payment method in sevDesk for tracking different payment types.
Create Private Transaction RuleTool to create a new private transaction rule in SevDesk.
Create TagTool to create a new tag and attach it to an object (Invoice, Order, Voucher, or CreditNote) in sevDesk.
Delete Accounting Contact By IDPermanently deletes an accounting contact from sevDesk by its unique identifier.
Delete Check Account By IDPermanently deletes a check account from sevDesk by its unique identifier.
Delete Check Account TransactionPermanently deletes a check account transaction from sevDesk by its unique identifier.
Delete Communication Way By IDPermanently deletes a communication way from sevDesk by its unique identifier.
Delete ContactPermanently deletes a contact from sevDesk by its unique identifier.
Delete Contact Address By IDTool to delete a contact address from sevDesk by its unique identifier.
Delete Contact Custom Field By IDTool to permanently delete a contact custom field by its ID.
Delete Contact Custom Field Setting By IDTool to permanently delete a contact custom field setting by its ID.
Delete Credit Note By IDPermanently deletes a credit note from sevDesk by its unique identifier.
Delete Order By IDPermanently deletes an order from sevDesk by its unique identifier.
Delete Order Position By IDPermanently deletes an order position from sevDesk by its unique identifier.
Delete Payment MethodDeletes a payment method in sevDesk by its ID.
Delete Private Transaction Rule By IDPermanently deletes a private transaction rule from sevDesk by its unique identifier.
Delete Tag By IDPermanently deletes a tag from sevDesk by its unique identifier.
Enshrine Check Account TransactionTool to enshrine a check account transaction by its ID.
Export Credit Note CSVTool to export credit notes as CSV from SevDesk.
Fetch Dictionary Entries By TypeTool to retrieve placeholders (dictionary entries) for a specific object type in sevDesk.
Find Contacts By Custom Field ValueTool to find contacts by custom field value.
Generate Progress Download HashTool to generate a download hash for an export job progress.
Get Accounting Contact By IDTool to retrieve accounting contact details by ID.
Get Accounting ContactsTool to retrieve accounting contacts from sevDesk.
Get SevClient Account InvoicesRetrieves all sevDesk account invoices for the authenticated client.
Get Check Account Balance At DateTool to get the balance of a check account at a specific date.
Get Check Account By IDTool to retrieve details of a specific check account by ID.
Get Check AccountsTool to retrieve a list of all check accounts.
Get Check Account Transaction By IDTool to retrieve a specific check account transaction by its ID.
Get Check Account TransactionsTool to retrieve list of check account transactions.
Get CommunicationWay By IDTool to retrieve details of a specific communication way by ID.
Get Communication Way KeysRetrieve a list of communication way keys from sevDesk.
Get Communication WaysTool to retrieve communication ways from sevDesk.
Get Contact Address By IDTool to retrieve details of a specific contact address by ID.
Get Contact AddressesTool to retrieve contact addresses from sevdesk.
Get Contact By IDTool to retrieve details of a specific contact by ID.
Get Contact Custom Field By IDTool to retrieve a contact custom field by its ID.
Get Contact Custom FieldsTool to retrieve contact custom fields from sevDesk.
Get Contact Custom Field Setting By IDTool to retrieve details of a specific contact custom field setting by ID.
Get Contact Custom Field Setting Reference CountTool to receive the count of references for a contact custom field setting.
Get Contact Custom Field SettingsTool to retrieve contact custom field settings from sevDesk.
Get ContactsTool to retrieve a list of contacts.
Get Contact Tabs Item CountTool to get the count of items across all tabs for a specific contact.
Get Credit Note PositionsTool to retrieve credit note positions from SevDesk.
Get Credit NotesTool to retrieve a list of credit notes.
Get Export Invoice CSVTool to export invoices as CSV from sevDesk.
Get Export Transactions CSVTool to export check account transactions as CSV file.
Get Invoice Is Partially PaidTool to check if an invoice is already partially paid.
Get Invoice PositionsTool to retrieve all line items (positions) for a specific invoice.
Get Invoice PositionsTool to retrieve invoice positions from sevDesk.
Get InvoicesRetrieves a list of invoices from sevDesk with optional filtering and pagination.
Get Letterpapers With ThumbnailsTool to retrieve all available letterpapers with thumbnails from sevDesk.
Get Next Customer NumberTool to retrieve the next free customer number from sevDesk.
Get Order By IDTool to retrieve details of a specific order by ID.
Get Order DiscountsTool to retrieve discounts applied to a specific order in sevDesk.
Get Order Position By IDTool to retrieve details of a specific order position by ID.
Get Order PositionsTool to retrieve order positions from SevDesk.
Get OrdersRetrieve a paginated list of orders from sevDesk.
Get Part By IDTool to retrieve details of a specific part by ID.
Get Part Contact PricesTool to retrieve a list of part contact prices.
Get PartsTool to retrieve a list of all parts.
Get Part StockTool to retrieve the current stock level of a specific part.
Get Part UnitiesRetrieves a list of part unities (units of measurement) from SevDesk.
Get Payment MethodsRetrieves all available payment methods from sevDesk.
Get PlacesRetrieve a list of places (cities/locations with geographic data) from sevDesk.
Get Private Transaction RulesTool to list existing private transaction rules in SevDesk.
Get Export ProgressTool to retrieve the progress of an export operation.
Get Receipt Guidance For Account NumberTool to retrieve receipt guidance for a specific Datev account number.
Get Receipt Guidance For All AccountsTool to retrieve receipt guidance for all accounts.
Get Receipt Guidance For ExpenseTool to retrieve guidance for expense accounts from sevDesk.
Get Receipt Guidance For RevenueTool to retrieve guidance for revenue accounts from sevDesk.
Get Receipt Guidance For Tax RuleTool to get guidance by tax rule from sevDesk.
Get Report Invoice ListTool to export invoice list report from sevDesk.
Get Report OrderlistTool to export the order list report from sevDesk.
Get SevClient ConfigRetrieves the sevClient configuration settings from sevDesk.
Get Tag By IDTool to retrieve details of a specific tag by ID.
Get Tag RelationsTool to retrieve tag relations from sevDesk.
Get TagsTool to retrieve tags from sevdesk.
Get Tax RulesRetrieves tax rules from SevDesk.
Get Bookkeeping System VersionTool to retrieve the bookkeeping system version from sevDesk.
Render InvoiceTool to render the PDF document of an invoice by its ID.
Reset Credit Note To OpenTool to reset a credit note status to open.
Save InvoiceTool to create a new invoice in SevDesk using the Factory endpoint.
Send Credit Note ByTool to mark a credit note as sent by updating its send status and type.
Send Credit Note By PrintingTool to send a credit note by printing and render it.
Send Invoice ByTool to mark an invoice as sent by specifying how it was sent to the customer.
Mark Order as SentTool to mark an order as sent in sevDesk.
Update Accounting ContactTool to update an existing accounting contact in SevDesk.
Update Check AccountUpdates an existing check account (bank account) in sevDesk by ID.
Update Check Account Transaction By IDTool to update an existing check account transaction in sevDesk.
Update Communication Way By IDTool to update an existing communication way by ID in sevDesk.
Update ContactTool to update an existing contact's details.
Update Contact Address By IDTool to update an existing contact address by its unique identifier.
Update Contact Custom FieldTool to update a contact custom field in SevDesk.
Update Contact Custom Field SettingTool to update an existing contact custom field setting in SevDesk.
Update Invoice ParameterTool to update an invoice parameter such as template, language, letterpaper, or PayPal settings.
Update Order By IDTool to update an existing order in sevDesk by ID.
Update Order TemplateTool to update an order parameter such as template, language, letterpaper, or PayPal settings.
Update Part By IDTool to update an existing part (product/service) in sevDesk.
Update SevClient Export ConfigTool to update the export configuration for a SevClient in sevDesk.
Update Tag By IDTool to update a tag's name in sevDesk by its ID.

Conclusion

You've successfully integrated Sevdesk with Codex using Composio's MCP server. Now you can interact with Sevdesk directly from your terminal, VS Code, or the Codex App using natural language commands.

Key benefits of this setup:

  • Seamless integration across CLI, VS Code, and standalone app
  • Natural language commands for Sevdesk operations
  • Managed authentication through Composio
  • Access to 20,000+ tools across 1000+ apps for cross-app workflows
  • CodeAct workbench for complex tool chaining

Next steps:

  • Try asking Codex to perform various Sevdesk operations
  • Explore cross-app workflows by connecting more toolkits
  • Build automation scripts that leverage Codex's AI capabilities

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FAQ

What are the differences in Tool Router MCP and Sevdesk MCP?

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

Can I use Tool Router MCP with Codex?

Yes, you can. Codex 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 Sevdesk tools.

Can I manage the permissions and scopes for Sevdesk while using Tool Router?

Yes, absolutely. You can configure which Sevdesk 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.

How safe is my data with Composio Tool Router?

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 Sevdesk data and credentials are handled as safely as possible.

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