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MCP Tax Calculator in Windsurf

2026 US federal brackets, computed in the conversation. us_federal_tax applies the 2026 US federal brackets for a single filer — marginal rates by band with the standard deduction applied first — and returns tax owed plus the effective rate; it is a planning estimate computed exactly, not a filing tool, and the bracket table it uses is in the source where you can read it.

One tool against the 100-tool ceiling; it is a planning estimate and the page says so, which is the honesty you want from a bracket calculator.

What you get in Windsurf

The contract suite walks real stdio cases through the bracket table: 95,000 gross less the 15,750 standard deduction is taxed band by band with the marginal rate applied only above each threshold, the returned effective rate equals tax divided by gross, and a below-deduction income returns zero.

Install it in Windsurf

The file is mcp_config.json, and the key inside it is mcpServers.

If you also run Claude Desktop, the shortest path there is one click: tax-calc.mcpb from the latest release opens as an extension, with no JSON and no terminal. Windsurf reads its own config, so here it is:

The config block:

{
  "mcpServers": {
    "tax-calc": {
      "command": "node",
      "args": ["/absolute/path/to/mcp-servers/servers/tax-calc/dist/index.js"]
    }
  }
}

The node command above wants a built file. From a clone, once:

git clone https://github.com/theluckystrike/mcp-servers.git
cd mcp-servers && npm install
npm run build -w packages/mcp-license -w servers/tax-calc

That writes servers/tax-calc/dist/index.js, and its absolute path is the one argument the config needs.

The npm packages are not published yet, so the form below returns a 404 today. It is here because it is what the entry becomes the day the publish lands, with nothing else changed:

{
  "mcpServers": {
    "tax-calc": {
      "command": "npx",
      "args": ["-y", "@theluckystrike/mcp-tax-calc"]
    }
  }
}

Save and reopen the MCP Servers list; Cascade picks it up without restarting the editor.

Nothing is published to npm yet, so the working install paths are the ones above: the .mcpb bundle from the latest release, a clone and build, or the hosted URL.

No install: the hosted endpoint

There is no hosted endpoint for this one yet. MCP Tax Calculator runs locally over stdio with the config above, which is also the only form in which it reads and writes files on your own disk. Thirty of the servers in this collection are served at https://mcp.zovo.one/mcp/<name> over MCP streamable HTTP; https://mcp.zovo.one/mcp/connect lists them and prints a ready URL for each.

Windsurf notes worth knowing first

Read this first: mcp_config.json applies to the legacy Cascade agent only. The Devin Local agent, the default for new tabs, takes its servers from the Devin CLI config files, so a correct entry here can still be invisible in a fresh tab. The other hard number is a cap: Cascade reaches at most 100 tools at once, and every enabled server spends from it.

Free: Everything: one tool, no metering, no key. Pro is $19 once, verified offline.

Questions

Where does Windsurf keep its MCP config?

~/.codeium/windsurf/mcp_config.json, under mcpServers. Reach it from the MCPs icon at the top right of the Cascade panel, or Devin Settings, Cascade, MCP Servers.

I edited the file and a new tab still cannot see MCP Tax Calculator.

That file applies to the legacy Cascade agent only. The Devin Local agent, the default for new tabs, reads its servers from the Devin CLI config files instead. Check which agent the tab runs.

How many servers can I load at once?

Cascade reaches at most 100 tools at any one time, and every enabled server spends from that single budget. MCP Tax Calculator contributes 1 tool, so keep the enabled list short rather than counting servers.

Related

MCP Tax Calculator in detail · The same server in VS Code and Cline · Every server in Windsurf · Guides · Windsurf docs · Buy Pro