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Terminal Tax MCP server

Which MCP servers are Terminal Tax's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-28

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Whose server it is
  • Registry nametax.terminal/filingverified in the MCP registry

The registry name sits under terminal.tax. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-28
  • Stateanswerschecked 2026-10-28
  • Tools3
  • Server calls itselfterminal-tax
  • Server version0.335.0
  • Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 433 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: Review and sign a completed return on a private page; Get IRS e-file acceptance status emailed after submission.
  • Checked on 5 of the 7 days it takes to judge reliability.

Once connected

  • create_filing_session change data without a sign-in: anyone with the address can call them.
  • Parameters are untyped or undescribed in 2 of 3 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 5, the first on 2026-10-28
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 5 so far
  • What an agent can do with it0 of 2 use cases
  • Use1 GitHub stars
  • Answeredmeasuring5 of the 7 daily checks it takes to print a share
  • Median first answer448 ms
  • Space in an agent's context≈ 1,700 tokensthe definitions of all its tools (3), which an agent carries on every turn
  • Tool definitionsB · 89 of 100
  • Typed results3 of 3 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 2 of 3

What an agent can do with it

  • not sure · File a U.S. income tax return from an AI assistant chat
  • cannot · Review and sign a completed return on a private page
  • cannot · Get IRS e-file acceptance status emailed after submission

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

  • Tools that change data, on a server that answers without a sign-in: create_filing_session

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers3 tools · read 2026-10-28
  • create_filing_session

    Starts a filing session for a US federal individual income tax return when the taxpayer asks to file. Input: none. Output: a continuationHandle that identifies this filing session in later calls, and packetRules, the packet rules as text…

  • get_packet_schema

    Takes the filing session's continuationHandle. Returns the packet schema a completed return packet is checked against (the packet holds no Social Security number, ITIN or PIN: the taxpayer types those on the filing page)…

  • continue_filing_session

    Checks the taxpayer's completed draft packet for a federal return and, when it passes, holds it as an unsigned draft and returns the link to the filing page; otherwise returns a list of problems to correct. This call files nothing and…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "filing": {
      "type": "http",
      "url": "https://mcp.terminal.tax/v1/hosted-mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http terminal https://mcp.terminal.tax/v1/hosted-mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcp.terminal.tax/v1/hosted-mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.