For AI agents

The index, as an MCP server.

TaxOSS speaks the Model Context Protocol. Point any MCP client at one URL and your agent can search open-source tax software by category, jurisdiction, and tax subject — the same index as this site, structured for tools. Read-only, no API key, free.

Endpoint

https://tax-oss.com/api/mcp

Streamable HTTP transport, stateless. Works with Claude (Desktop/Code), Cursor, VS Code, and any client speaking MCP 2025-03-26 or later.

Claude Code

claude mcp add --transport http taxoss https://tax-oss.com/api/mcp

JSON client config (Cursor, VS Code, Claude Desktop)

{
  "mcpServers": {
    "taxoss": {
      "url": "https://tax-oss.com/api/mcp"
    }
  }
}

Tools

search_projectsFree text + category, jurisdiction, and tax-subject filters

get_projectFull record for one project, by owner/name or HF URL

list_categoriesThe 20 tool-type categories, with counts

list_facets19 jurisdictions and 12 tax subjects, with counts

Try asking your agent

“Find an open-source VeriFactu library for Spain” · “Which MCP servers exist for German taxes?” · “Show me crypto tax calculators with the most stars” · “What open-source tax datasets exist for training?”

The index itself lists tax MCP servers from the wider ecosystem — this endpoint is TaxOSS eating its own cooking.