> This page is for version v5.0.
> For other versions, use one of these documentation indexes:
> - v6.0 (default): https://docs.zip.tax/v-6-0/llms.txt
> - v5.0: https://docs.zip.tax/v-5-0/llms.txt

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.zip.tax/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.zip.tax/_mcp/server.

# Agents & LLMs

Modern AI agents, developer copilots, and large language models increasingly
rely on machine-readable documentation to understand how to interact with
APIs. Ziptax publishes first-class resources designed for this workflow,
from a hosted MCP server to a drop-in Claude Skill to a machine-readable
OpenAPI specification, so your agent can look up door-level U.S. and
Canadian sales tax rates with minimal setup.

## Available resources

#### [Claude Skill](claude-skill)

Drop-in Skill for Claude Desktop that teaches Claude how to call the
Ziptax API and reason about sales tax data.

#### [MCP Server](mcp-server)

Hosted Model Context Protocol server exposing `lookup_tax_rate` and
`get_account_metrics` tools over Streamable HTTP.

#### [Machine-Readable OpenAPI Spec](openapi-spec)

Canonical OpenAPI v3 JSON document describing every endpoint,
parameter, and response schema.

## LLM reference file

Ziptax publishes an `llms.txt` index at
[docs.zip.tax/llms.txt](https://docs.zip.tax/llms.txt) that
acts as a machine-readable map of the developer documentation. Pointing an
agent at this file improves accuracy when generating code, answering
developer questions, or orchestrating tax calculations inside automated
workflows.

> **Info**
>
> Need an API key? Create a free account at
> [platform.zip.tax](https://platform.zip.tax).