# Arc & Ledger Tax Reference

> Read-only US tax reference for notices, deadlines, filing screens, and clearly labeled estimates.

- name: com.arcandledger/tax-tools
- version: 0.15.1
- connection class: unknown (unknown)
- trust: 71/100
- quality: 85/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.arcandledger%2Ftax-tools
- tools: https://api.protogrid.dev/v1/servers/com.arcandledger%2Ftax-tools/tools

**Not classified yet.** The remote endpoints have not been probed successfully, or the listing has nothing to connect to.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "tax-tools": {
      "type": "http",
      "url": "https://mcp.arcandledger.com/directory/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 29
- freshness: 85
- provenance: 85
- drivers: +repository +dns-namespace +website -unreachable(1 failures) ~updated-84d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 85/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 86 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 13 of 13 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: decode_irs_notice (idempotentHint); deadline_calendar (idempotentHint); check_fbar_fatca (idempotentHint); …
- pass `tools.token_cost`: about 4,749 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: 1 tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 13, about 4,749 tokens to load them all
- tool set hash: 9d45a6685e5868f61c29765e6db60a7f
- tools last changed: 2026-10-14T17:27:53.283Z
- badge: [![protogrid quality](https://protogrid.dev/badge/com.arcandledger/tax-tools.svg)](https://protogrid.dev/servers/com.arcandledger/tax-tools)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-14 `check_resolution_options` changed (inputSchema)

Full history: https://api.protogrid.dev/v1/servers/com.arcandledger%2Ftax-tools/changes

## Remotes

- https://mcp.arcandledger.com/directory/mcp (streamable-http, auth none, reachable false, uptime30d 0.9655172)

## Packages

_none_

## Tools (13)

- `check_5472_obligation`: Use to screen common Form 5472 triggers for a foreign-owned US disregarded entity or corporation. The result is a general filing screen and does not prepare or file the form.
- `check_fbar_fatca`: Use to screen general FBAR and Form 8938 thresholds from aggregate balance, filing status, residence, and account-count facts. Do not request account numbers, institution names, or statements.
- `check_itin_eligibility`: Use to screen general ITIN reason categories, whether a return is commonly attached, and supporting-document requirements. Never request or process an actual ITIN, passport, or identity document.
- `check_resolution_options`: Use to screen general IRS payment and collection alternatives from a rough balance, filing-compliance status, ability-to-pay category, and coarse tax-account type when known. This is an educational fit screen, not a promise that the IRS will approve an option.
- `check_treaty_withholding`: Use to explain general US withholding rules, documentation, and supported US-Turkey treaty rates for a payment category. Treaty eligibility and source rules depend on the full facts.
- `deadline_calendar`: Use to return common federal filing and payment dates for a selected filer or entity type. The user must verify the date for weekends, holidays, extensions, fiscal years, and special facts.
- `decode_irs_notice`: Use when a user provides the code from an IRS notice or letter and wants a general explanation, the usual response window, or the next procedural step. Do not request the notice itself or any taxpayer identifier.
- `estimate_accountable_plan`: Use to estimate potentially reimbursable business expenses under an accountable-plan scenario, including the split 2026 business-mileage rates. The result does not establish a plan or determine substantiation.
- `estimate_augusta_rule`: Use to screen the fewer-than-15-days home-rental rule under IRC 280A(g) and calculate conditional amounts. Keep the owner-side income exclusion separate from the business-side requirements for ordinary and necessary use and reasonable rent.
- `estimate_irs_penalty`: Use to estimate selected federal failure-to-file, failure-to-pay, and underpayment amounts from nonidentifying figures. The result is an estimate and does not replace an IRS account transcript.
- `estimate_quarterly_taxes`: Use to estimate federal quarterly tax payments from nonidentifying income, entity, withholding, and prior-year tax figures. Return the assumptions, safe-harbor context, and due dates.
- `estimate_rental_income`: Use to estimate a basic rental-income result from nonidentifying figures and identify the modeled depreciation, passive-loss, and personal-use limitations.
- `explain_tax_document`: Use when a user names a US tax form or information document and wants to understand its purpose, common fields, or usual return treatment. Do not request or accept the document itself.