tax-jar

name

tax-jar

description

TaxJar is a tax compliance platform that provides APIs for sales tax calculation, reporting, and filing automation, allowing eCommerce businesses, marketplaces, and developers to manage multi-jurisdiction tax obligations and integrate tax workflows into checkout, billing, and back-office systems. Read and write TaxJar data through One: customers, refundtransactions, ordertransactions, transactions, categories, nexusregions and more, 21 actions with real parameter documentation. Use whenever the user asks to look something up in TaxJar, create or update a record there, or build code against the TaxJar API.

TaxJar through One

TaxJar is a tax compliance platform that provides APIs for sales tax calculation, reporting, and filing automation, allowing eCommerce businesses, marketplaces, and developers to manage multi-jurisdiction tax obligations and integrate tax workflows into checkout, billing, and back-office systems.

One exposes TaxJar through four MCP tools. The table below carries real action ids from One's knowledge base, so for a common operation you can skip search and go straight to reading the action's parameters.

How to run an action

1. Find the action in the table below, or call search_one_platform_actions with platform tax-jar if it is not listed.
2. Call get_one_action_knowledge with the action id. Do this every time, including for actions in this table. The table gives you the id, not the parameters.
3. Call execute_one_action with parameters copied from that knowledge.

Never guess a parameter name, a body field, or an enum value. The knowledge has the real schema, and a guessed field is either a 400 or a silent write of the wrong thing.

Before you start

Call list_one_integrations once and confirm TaxJar is connected. If it is missing, the user has not connected it: say so and point them at https://app.withone.ai rather than reaching for raw HTTP.

Each connection carries an access field. If it reports {"policy": "methods", "methods": ["GET"]} the agent is read-only here, so plan a read-only answer instead of attempting a write that will be refused.

Before a write

Creates, updates, deletes and sends land on a real TaxJar account and cannot be recalled. State the action and the specific target in one line before the first write in a task, and let the user stop you. Reads need no confirmation.

Actions

Customers

Action	Method	Path	Action id
List Customers	GET	/v2/customers	conn_mod_def::GLWDVl6s41A::UJn51QZ3Tg6MnnjATfCn7w
Show a Customer	GET	/v2/customers/{{customerId}}	conn_mod_def::GLWDVmyAAvA::6JsP6WfITbGhxntTaNT9Eg
Create Customer	POST	/v2/customers	conn_mod_def::GLWDVk8zCPA::cRS5OJoGSKq-xLGAt-bKTg
Delete a Customer	DELETE	/v2/customers/{{customerId}}	conn_mod_def::GLWDVniJ1EA::QpEroI9oQjChVm37CjqDWA
Update a Customer	PUT	/v2/customers/{{customerId}}	conn_mod_def::GLWDVxWQj0A::g1X4yt62TM2G_0OI23kzRg

RefundTransactions

Action	Method	Path	Action id
Show Refund Transaction	GET	/v2/transactions/refunds/{{transactionId}}	conn_mod_def::GLWDWAb4ZRA::17R1hbZVSzamdSFQxy5r9Q
Create Refund Transaction	POST	/v2/transactions/refunds	conn_mod_def::GLWDWJX2Zcg::Fvca6tDQSleBct2yuMLezQ
Delete a Refund Transaction	DELETE	/v2/transactions/refunds/{{transactionId}}	conn_mod_def::GLWDV64ZS9A::zg2I1rFhRhC-BqIvPlF7Zg
Update a Refund Transaction	PUT	/v2/transactions/refunds/{{transactionId}}	conn_mod_def::GLWDWJXuoYA::8je1_okZQOCRCL7X7v0e0g

OrderTransactions

Action	Method	Path	Action id
Delete an Order Transaction	DELETE	/v2/transactions/orders/{{transactionId}}	conn_mod_def::GLWDV64M3Dg::QQrPOhCUT8O5TnJRuXRAYQ
Update Order Transaction	PUT	/v2/transactions/orders/{{transactionId}}	conn_mod_def::GLWDWK6DkbA::tg3ST_2IQ4OGbQT7AvI2EA

Transactions

Action	Method	Path	Action id
Show an Order Transaction	GET	/v2/transactions/orders/{{transactionId}}	conn_mod_def::GLWDWN7F7Ig::pm7CKOPTTj2MWiwVezt0iw
Create Order Transaction	POST	/v2/transactions/orders	conn_mod_def::GLWDWK5pJ_g::CmWNV1o_SmKDtvuUAciLJA

Categories

Action	Method	Path	Action id
List Tax Categories	GET	/v2/categories	conn_mod_def::GLWDVmjPXtA::kIFfQWtfQc-k71x2YLzG3A

NexusRegions

Action	Method	Path	Action id
List Nexus Regions	GET	/v2/nexus/regions	conn_mod_def::GLWDVwj88Jg::Mxv_LvhZRYG6fkJCYQKxng

Taxes

Action	Method	Path	Action id
Calculate Sales Tax for an Order	POST	/v2/taxes	conn_mod_def::GLWDVw-tY1A::9ELWz97hQ_SKHwSfT0iCEQ

SummaryRates

Action	Method	Path	Action id
Summary Rates	GET	/v2/summary_rates	conn_mod_def::GLWDVxURl1g::bKjhRh3jTj2p9U0rn-Vjtw

SalesTaxRates

Action	Method	Path	Action id
Get Sales Tax Rates for a Location	GET	/v2/rates/{{zip}}	conn_mod_def::GLWDVyY4qKA::Y_B8VlxMQ6qZUUHsXUOyuA

Orders

Action	Method	Path	Action id
List Orders	GET	/v2/transactions/orders	conn_mod_def::GLWDV7IXltg::WgKPxrsmTTC4ntGxRt0WzQ

Refunds

Action	Method	Path	Action id
List Refunds	GET	/v2/transactions/refunds	conn_mod_def::GLWDV7aMiOA::OnxwMZx7Ru6ExxVLNU5mFg

Addresses

Action	Method	Path	Action id
Validate Address	POST	/v2/addresses/validate	conn_mod_def::GLWDWVf-Llg::EMav-LAyRmO9SYSk5VHtCw

When a call fails

The error comes from TaxJar, not from One. A 400 or 422 means your parameters do not match the schema, so re-read the knowledge and fix the field. A 401 or 403 means the connection needs re-authorizing, which no retry will fix. A 404 means the id is not on this account. A 429 means slow down. Never retry a write more than once: the first attempt may have landed.

Full catalog: https://www.withone.ai/knowledge/tax-jar

Integration knowledge by One (withone.ai), licensed under One-Knowledge-1.0. Attribution must be preserved in derivative works.