rates
MCP serverEverything elseRead-only Canadian GST/HST rates, small-supplier check and CRA allowance rates, with CRA sources.
Available today. Use it from your connected AI after setup.
No other account needed.
Add ahel to your AI once: Claude, ChatGPT, Cursor, Claude Code or Codex. Then ask it to use this.
Then ask your AI: use the gst hst small supplier check tool from rates
Install rates
The server’s own address, for the clients that take one directly. Or connect ahel once and every client you use reads it from one address, with the account kept on ahel rather than in each client’s config.
Claude Code
claude mcp add --transport http --scope user rates 'https://mcp.tallyfern.com/mcp'Run it once in your project, then open /mcp to approve any sign-in the server asks for.
Claude Desktop
https://mcp.tallyfern.com/mcpAdd a custom connector in Settings, paste this address, and approve the sign-in.
Cursor
cursor://anysphere.cursor-deeplink/mcp/install?name=rates&config=eyJ1cmwiOiJodHRwczovL21jcC50YWxseWZlcm4uY29tL21jcCJ9Open the link and Cursor adds the server at that address.
ChatGPT
https://mcp.tallyfern.com/mcpIn Settings, enable Developer mode, create an MCP app, and paste this address. Your plan and workspace must allow custom apps.
Codex
codex mcp add rates --url 'https://mcp.tallyfern.com/mcp'Run it once, then sign in with codex mcp login rates if the server asks for an account.
Tools it offers (5)
What this server listed when ahel dialed its public endpoint in Oct 2026, with no key and no account of yours. The names are the server’s own.
gst_hst_small_supplier_checkgst_hst_rate_by_provincecra_automobile_allowance_ratecra_meal_travel_allowanceontario_hst_basics
ahel review
S5low
no public repository, nothing to review
Automated review, not a security audit. Ruleset v1.
Advanced
- Delivery
- rates MCP server → your ahel connector (mcp.ahel.ai) → your AI.
- Item type
- mcp-server
- Key
com-tallyfern-rates- Hosted endpoint
https://mcp.tallyfern.com/mcp