# How to integrate Taxjar MCP with Atomic Agent

```json
{
  "title": "How to integrate Taxjar MCP with Atomic Agent",
  "toolkit": "Taxjar",
  "toolkit_slug": "taxjar",
  "framework": "Atomic Agent",
  "framework_slug": "atomic-agent",
  "url": "https://composio.dev/toolkits/taxjar/framework/atomic-agent",
  "markdown_url": "https://composio.dev/toolkits/taxjar/framework/atomic-agent.md",
  "updated_at": "2026-08-11T13:15:22.967Z"
}
```

## Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including Taxjar.
This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a Taxjar account. See the [Atomic Agent documentation](https://atomicagent.io/docs/?cta_placement=atomic-agent-docs) for installation instructions.

## Also integrate Taxjar with

- [OpenAI Agents SDK](https://composio.dev/toolkits/taxjar/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/taxjar/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/taxjar/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/taxjar/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/taxjar/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/taxjar/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/taxjar/framework/hermes-agent)
- [Google ADK](https://composio.dev/toolkits/taxjar/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/taxjar/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/taxjar/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/taxjar/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/taxjar/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/taxjar/framework/crew-ai)
- [Pydantic AI](https://composio.dev/toolkits/taxjar/framework/pydantic-ai)
- [AutoGen](https://composio.dev/toolkits/taxjar/framework/autogen)

## TL;DR

### How Atomic Agent connects to Taxjar
Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.
Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

## Connect Taxjar to Atomic Agent

### Connect Taxjar to Atomic Agent
- Sign up or sign in to the [Composio dashboard](https://dashboard.composio.dev/?cta_placement=atomic-agent-api-key). Copy your API key.
- In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
- Ask Atomic Agent to do something in Taxjar. It searches Composio for the right tool.
- On first use, open the sign-in link returned in the chat. Connect your Taxjar account, then return to Atomic Agent to continue.
### Headless setup
Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

```bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY
```

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

The Taxjar MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Taxjar account. It provides structured and secure access to your sales tax data, so your agent can perform actions like calculating sales tax, managing transactions, listing customers, and monitoring nexus regions on your behalf.
- Real-time tax calculation for orders: Instantly calculate accurate sales tax for new orders, factoring in nexus addresses, line items, shipping, and exemptions.
- Order and refund transaction management: Let your agent create, list, or delete order and refund transactions to streamline your sales and returns workflow.
- Customer database access: Effortlessly retrieve, list, or delete customer records for tax reporting and compliance purposes.
- Nexus region insights: Quickly identify and list all nexus regions where your business has sales tax obligations.
- Automated transaction reporting: Access up-to-date lists of transactions and refunds for reconciliation, filing, and audit readiness.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `TAXJAR_CALCULATE_SALES_TAX_FOR_AN_ORDER` | Calculate Sales Tax For An Order | Tool to calculate sales tax for an order. Use when you need an accurate tax calculation including nexus addresses, line items, shipping, and exemptions. |
| `TAXJAR_CREATE_CUSTOMER` | Create Customer | Tool to create a new customer with exemption information. Use when you need to add a customer to your TaxJar account for tax exemption management. |
| `TAXJAR_CREATE_ORDER_TRANSACTION` | Create Order Transaction | Creates a new order transaction in TaxJar for sales tax reporting and compliance. This action records order transactions that will appear in the TaxJar dashboard for tax filing purposes. The transaction includes customer location, order amounts, shipping costs, and sales tax collected. Important: The 'amount' field must include shipping but exclude sales tax. If line_items are provided, their sum (quantity * unit_price - discount) must equal amount minus shipping. |
| `TAXJAR_CREATE_REFUND_TRANSACTION` | Create Refund Transaction | Tool to create a new refund transaction. Use after confirming refund details. |
| `TAXJAR_DELETE_CUSTOMER` | Delete Customer | Tool to delete an existing customer. Use when you need to remove a previously created customer by its ID. Example: "Delete customer cust_12345". |
| `TAXJAR_DELETE_ORDER_TRANSACTION` | Delete Order Transaction | Tool to delete an existing order transaction. Use when you need to remove a previously created order transaction by its ID. Example: "Delete transaction abc123". |
| `TAXJAR_DELETE_REFUND_TRANSACTION` | Delete Refund Transaction | Tool to delete an existing refund transaction. Use when you need to remove a previously created refund transaction by its ID. Example: "Delete refund 243345". |
| `TAXJAR_LIST_CUSTOMERS` | List Customers | Lists all customer IDs from your TaxJar account. Returns a paginated list of customer IDs (strings). To get full details for a specific customer (including name, address, exemption type, etc.), use the customer ID with the 'Show Customer' action. Use this action to: - Browse all customers in your TaxJar account - Find customer IDs for further operations - Check which customers have been created |
| `TAXJAR_LIST_NEXUS_REGIONS` | List Nexus Regions | Tool to list existing nexus regions for an account. Use after authenticating your account to discover where you have nexus for sales tax purposes. |
| `TAXJAR_LIST_ORDER_TRANSACTIONS` | List Order Transactions | List order transaction IDs within a date range. Returns an array of transaction IDs (strings) for orders created between the specified dates. Use this to discover which orders exist in a date range, then use SHOW_ORDER_TRANSACTION to get details for specific IDs. |
| `TAXJAR_LIST_REFUND_TRANSACTIONS` | List refund transactions | Lists refund transaction IDs within a specified date range. Returns an array of transaction IDs only. To get detailed information about a specific refund, use the 'Show refund transaction' action with the ID. Useful for finding refunds created through the TaxJar API within a specific time period. |
| `TAXJAR_LIST_TAX_CATEGORIES` | List Tax Categories | Tool to list all product tax categories and their codes. Use when you need to discover available tax categories before assigning them to products. |
| `TAXJAR_SHOW_CUSTOMER` | Show Customer | Tool to show an existing customer. Use when you need to retrieve details of a specific customer via TaxJar API. |
| `TAXJAR_SHOW_ORDER_TRANSACTION` | Show Order Transaction | Tool to show an existing order transaction by ID. Use when you need to retrieve full details of a specific order transaction after creation or listing. |
| `TAXJAR_SHOW_REFUND_TRANSACTION` | Show Refund Transaction | Retrieves detailed information about a specific refund transaction from TaxJar. Use this tool when you need to: - View complete details of a refund transaction including amounts, addresses, and line items - Verify refund transaction data that was previously created - Audit refund information for tax reporting purposes Requires a valid transaction_id that was previously created through TaxJar's API. |
| `TAXJAR_SHOW_TAX_RATES_FOR_A_LOCATION` | Show Tax Rates for a Location | Tool to show sales tax rates for a location. Use when you need to retrieve sales tax rates for a specific ZIP code with optional address details (city, state, country, street). |
| `TAXJAR_SUMMARIZE_TAX_RATES_FOR_ALL_REGIONS` | Summarize Tax Rates for All Regions | Tool to retrieve minimum and average sales tax rates by region. Use when you need a backup of regional tax summary rates. |
| `TAXJAR_UPDATE_CUSTOMER` | Update Customer | Tool to update an existing customer in TaxJar. Use when you need to modify customer details such as exemption type, name, or address information. |
| `TAXJAR_UPDATE_ORDER_TRANSACTION` | Update Order Transaction | Tool to update an existing order transaction. Use when adjusting order details such as amount, shipping, or line items after creation. |
| `TAXJAR_UPDATE_REFUND_TRANSACTION` | Update Refund Transaction | Tool to update an existing refund transaction. Use when adjusting refund details such as amount, shipping, or line items after creation. |
| `TAXJAR_VALIDATE_VAT_NUMBER` | Validate VAT Number | Validates EU VAT identification numbers against the VIES (VAT Information Exchange System) database. Use this tool to: - Verify VAT number format and validity - Check if a VAT number is registered and active in the EU - Retrieve associated company name and address when available - Confirm tax-exempt eligibility before processing transactions The validation queries the European VIES database when available, returning company details for valid registrations. When VIES is unavailable, it falls back to format-based validation using regex patterns. |

## Supported Triggers

None listed.

## Troubleshooting

### Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

### Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

### Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See [Composio pricing](/pricing) for the current limits that apply to your connection.

## Complete Code

None listed.

## Conclusion

### Use Taxjar from Atomic Agent
With your account connected, ask Atomic Agent to work with Taxjar in natural language. You can connect more apps through the same Composio integration as you need them.
Visit the [Atomic Agent website](https://atomicagent.io/?cta_placement=atomic-agent-site) or inspect the [Atomic Agent source code](https://github.com/AtomicBot-ai/atomic-agent?cta_placement=atomic-agent-repo).

## How to build Taxjar MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/taxjar/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/taxjar/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/taxjar/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/taxjar/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/taxjar/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/taxjar/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/taxjar/framework/hermes-agent)
- [Google ADK](https://composio.dev/toolkits/taxjar/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/taxjar/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/taxjar/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/taxjar/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/taxjar/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/taxjar/framework/crew-ai)
- [Pydantic AI](https://composio.dev/toolkits/taxjar/framework/pydantic-ai)
- [AutoGen](https://composio.dev/toolkits/taxjar/framework/autogen)

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## Frequently Asked Questions

### What are the differences in Tool Router MCP and Taxjar MCP?

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

### Can I use Tool Router MCP with Atomic Agent?

Yes, you can. Atomic Agent 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 Taxjar tools.

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

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

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