How to integrate Chaser 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 Chaser MCP integration, you can draft, triage, summarise emails, and much more, all without leaving the terminal or the app, whichever you prefer.

Also integrate Chaser 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 Chaser 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 Chaser MCP server, and what's possible with it?

The Chaser MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Chaser account. It provides structured and secure access to your accounts receivable data, so your agent can create and manage invoices, update customer records, generate credit notes, and retrieve key financial details on your behalf.

  • Automated invoice management: Create, update, and track invoices programmatically—making it easy for your agent to help you stay on top of accounts receivable.
  • Customer information handling: Retrieve, create, and update customer records so your assistant can help onboard new clients or keep customer details up-to-date.
  • Credit note processing: Generate and fetch credit notes, allowing your agent to handle adjustments and reconciliations quickly and accurately.
  • Organization data retrieval: Access up-to-date information about your organization, including IDs, currency settings, and compliance details, for seamless financial operations.
  • Efficient accounts review: Instantly pull lists of customers or credit notes to review outstanding balances, statuses, and financial health—all through conversational prompts.

Supported Tools & Triggers

Tools
Create Contact PersonTool to create a new contact person for a customer in Chaser.
Create InvoiceTool to create a new invoice record in the organization.
Create OverpaymentCreates a new overpayment record in Chaser for tracking customer overpayments.
Delete Contact PersonTool to delete a contact person from a customer record in Chaser.
Get Contact Person by IDTool to get a specific contact person by ID for a customer.
Get Credit Note by IDRetrieve detailed information for a specific credit note by its ID.
Get Credit NotesRetrieves a list of credit notes from Chaser.
Get Current OrganisationTool to retrieve information about the current organisation associated with the API credentials.
Get Customer by IDRetrieve detailed information for a specific customer by their Chaser customer ID.
Get CustomersTool to retrieve a list of all customers associated with the organization.
Get Invoice by IDTool to retrieve detailed information for a specific invoice by its ID.
Get OrganizationTool to retrieve information about the connected organizations.
Get OverpaymentRetrieve detailed information for a specific overpayment by its ID.
Get StatusTool to check the status of the Chaser API.
List Contact PersonsTool to retrieve contact persons for a specific customer.
List InvoicesTool to retrieve invoices with pagination and filtering.
List OverpaymentsTool to retrieve overpayments from Chaser with pagination and filtering.
Create Credit NoteCreates a new credit note record in Chaser for tracking customer credits.
Create CustomerTool to create a new customer record in Chaser.
Update Credit NoteUpdate an existing credit note in Chaser.
Update CustomerTool to update an existing customer's information using their unique Chaser customer ID.
Update InvoiceUpdate an existing invoice in Chaser by its internal ID.
Update Contact PersonTool to update a contact person for a customer in Chaser.
Update OverpaymentTool to update an overpayment record in Chaser.
Upload Invoice PDFUpload a PDF file to an existing invoice in Chaser.
Bulk Upsert CustomersTool to bulk upsert up to 100 customers in a single operation.
Bulk Upsert Contact PersonsTool to bulk insert or update contact persons for a customer.
Bulk Upsert Credit NotesTool to bulk upsert up to 100 credit notes in a single request.
Bulk Upsert InvoicesTool to bulk upsert up to 100 invoices in a single request.
Bulk Upsert OverpaymentsTool to bulk upsert up to 100 overpayments in Chaser, matching by overpayment_id.

Conclusion

You've successfully integrated Chaser with Codex using Composio's MCP server. Now you can interact with Chaser 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 Chaser 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 Chaser 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 Chaser MCP?

With a standalone Chaser MCP server, the agents and LLMs can only access a fixed set of Chaser tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Chaser 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 Chaser tools.

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

Yes, absolutely. You can configure which Chaser 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 Chaser data and credentials are handled as safely as possible.

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