# io.github.christianclaudio/taxcode (pypi · mcp-server-taxcode)

MCP server for US Federal, territorial, and state tax law and compliance.

- Trust score: 79/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- oci · `ghcr.io/christianclaudio/mcp-server-taxcode`: 17/100, [markdown](https://verifymcp.io/servers/christianclaudio-taxcode/ghcr-io-christianclaudio-mcp-server-taxcode.md), [page](https://verifymcp.io/servers/christianclaudio-taxcode/ghcr-io-christianclaudio-mcp-server-taxcode)
- pypi · `mcp-server-taxcode`: 79/100 (this document), [markdown](https://verifymcp.io/servers/christianclaudio-taxcode/mcp-server-taxcode.md), [page](https://verifymcp.io/servers/christianclaudio-taxcode/mcp-server-taxcode)

## Channel facts

- Registry: `pypi`
- Package: `mcp-server-taxcode`
- Version: `0.7.2`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-18.

- **Supply Chain Security**: 94/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - Declares code that runs automatically (build-time code we could not rule out (a Hatch, PDM or setuptools build hook, a dynamic version we could not read statically, shipped VCS metadata or a stray root module)) and that we could not recognise. It may be perfectly ordinary, but we have not established what it does.
  - 2 of 41 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 100/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to christianclaudio/mcp-server-taxcode).
  - Clear OSI-approved license (Apache-2.0).
  - Actively maintained (last published 0 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 70/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (fair).
  - Context-footprint check failed: tool/resource definitions use about 1074 tokens (~119/item across 9 items; 8 tools + 1 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 13/100
  - Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 74/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 8% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the io.github.christianclaudio/taxcode MCP server?

io.github.christianclaudio/taxcode runs locally as a PyPI package, launched with uvx mcp-server-taxcode. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add christianclaudio-taxcode -- uvx mcp-server-taxcode
```

### Cursor

```json
{
  "mcpServers": {
    "christianclaudio-taxcode": {
      "command": "uvx",
      "args": [
        "mcp-server-taxcode"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "christianclaudio-taxcode": {
      "command": "uvx",
      "args": [
        "mcp-server-taxcode"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add christianclaudio-taxcode -- uvx mcp-server-taxcode
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "christianclaudio-taxcode": {
      "type": "local",
      "command": [
        "uvx",
        "mcp-server-taxcode"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add christianclaudio-taxcode --command uvx --arg mcp-server-taxcode
```

### Hermes

```yaml
mcp_servers:
  christianclaudio-taxcode:
    command: "uvx"
    args: ["mcp-server-taxcode"]
```

### Netclaw

```json
{
  "McpServers": {
    "christianclaudio-taxcode": {
      "Transport": "stdio",
      "Command": "uvx",
      "Arguments": [
        "mcp-server-taxcode"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add christianclaudio-taxcode -t stdio -c uvx -a mcp-server-taxcode
```

### Other

```json
{
  "mcpServers": {
    "christianclaudio-taxcode": {
      "command": "uvx",
      "args": [
        "mcp-server-taxcode"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-18 (score 79, +16)

- [security improvement] Malware scan: unverified → pass

### 2026-10-17 (score 63, −14)

- [security regression] Malware scan: pass → unverified
- [functional regression] Schema quality: 82 → 99
- [functional regression] Schema quality: pass → fail
- [functional improvement] Tool coverage: 0% → 8%
- [functional improvement] Tool coverage: 0% → 6%
- [functional] Package version: 0.6.0 → 0.7.1
- [functional] Package version: 0.6.0 → 0.7.0
- [functional] Package version: 0.6.0 → 0.6.1

### 2026-10-16 (score 77, +15)

- [security regression] Stability: 0.03 → unverified
- [security regression] Tool safety: pass → unverified
- [security improvement] Malware scan: unverified → pass
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional regression] Schema quality: 100 → unverified
- [functional] Package version: 0.5.0 → 0.6.0
- [functional] Package version: 0.5.0 → 0.5.1

### 2026-10-15 (score 62, +1)

- [functional improvement] Stability: unverified → 0.03
- [functional] Package version: 0.1.3 → 0.5.0

### 2026-10-14 (score 61, +13)

- [security regression] Malware scan: pass → unverified
- [security improvement] Injection markers: unverified → pass
- [security] First check of Judged manipulation: pass
- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] Schema quality: unverified → 100
- [functional improvement] MCP protocol: unverified → pass
- [functional] First check of Schema quality: fail
- [functional] First check of Destructive annotations: pass
- [functional] First check of Schema quality: fair
- [functional] First check of Tool coverage: 100
- [functional] First check of Schema quality: pass
- [functional] First check of Tool coverage: 0

### 2026-10-13 (score 48)

First indexed and scored.

## MCP tools (8)

### `system_get_health_status` (~24 tokens)

System Get Health Status

Check the operational health of the taxcode server and DuckDB storage.

### `statutes_lookup_statute` (~110 tokens)

Statutes Lookup Statute

Retrieve exact statutory language, temporal version, and metadata by citation, section code, or the record id from statutes_search_tax_code (pass a result's id as citation_or_section to get its full text).

Input parameters:

- `citation_or_section` (string, required): Citation ('26 U.S.C. § 933'), section code ('933'), or a record id from statutes_search_tax_code results ('us-irc-933').
- `jurisdiction`
- `lang` (string)
- `tax_year`

### `statutes_search_tax_code` (~218 tokens)

Statutes Search Tax Code

Keyword and concept search across Federal and State statutory corpora. Multi-word queries match individual terms: rows with the whole phrase rank first, then by how many terms match, then newer effective year first (empty or non-numeric years last), then id. Each result is a short snippet (up to 300 characters around the first matched term) with its id, citation, title, jurisdiction, year, validity and content labels, not the full text: call statutes_lookup_statute with citation_or_section set to the result's id to read the full text.

Input parameters:

- `corpus`: Optional corpus code, e.g. 'IRC', 'RCW', 'LEY60'. A jurisdiction code or name ('washington') is also accepted and filters by jurisdiction.
- `jurisdiction`: Optional jurisdiction code or full name, e.g. 'WA' or 'Washington', 'PR' or 'Puerto Rico', 'US' or 'federal'.
- `limit` (integer)
- `query` (string, required)
- `tax_year`

### `statutes_list_publications` (~103 tokens)

Statutes List Publications

List administrative circulars, tax guidance publications, and bulletins.

Input parameters:

- `category`: Optional publication category. Valid values: boletin-informativo, carta-circular, determinacion-administrativa, irs-publication, policy-bulletin. Case, spaces, hyphens and underscores are ignored ('c…
- `limit` (integer)
- `since_date`

### `compliance_evaluate_pr_bona_fide_residency` (~162 tokens)

Compliance Evaluate Pr Bona Fide Residency

Evaluate statutory criteria for PR bona fide residency under IRC § 937 and 26 CFR § 1.937-1. Its reporting_requirements say when IRS Form 8898 must be filed: in the tax year you became or stopped being a bona fide PR resident, if your worldwide gross income is more than $75,000 (IRS Instructions for Form 8898).

Input parameters:

- `closer_connection_jurisdiction` (string)
- `days_present_pr` (integer, required)
- `days_present_us` (integer, required)
- `has_us_tax_home` (boolean)
- `prior_year_1_pr_days` (integer)
- `prior_year_2_pr_days` (integer)
- `tax_year`

### `compliance_calculate_built_in_gain_sourcing` (~105 tokens)

Compliance Calculate Built In Gain Sourcing

Calculate US vs PR capital gain sourcing under Treas. Reg. § 1.937-2(f) (10-year rule).

Input parameters:

- `adjusted_basis`
- `days_held_as_resident`
- `fmv_on_residency_date`
- `is_marketable` (boolean, required)
- `total_days_held`
- `total_gain` (number, required)
- `years_since_residency` (number)

### `compliance_evaluate_georgia_residency` (~171 tokens)

Compliance Evaluate Georgia Residency

Evaluate Georgia statutory residency criteria under O.C.G.A. § 48-7-1(10) and Ga. Comp. R. & Regs. r. 560-7-3-.01, and compute state income tax.

Input parameters:

- `age` (integer)
- `days_present_ga` (integer, required)
- `federal_agi` (number)
- `filing_status` (string)
- `ga_driver_license_active` (boolean)
- `ga_homestead_exemption_claimed` (boolean)
- `ga_voter_registration_active` (boolean)
- `is_domiciled_in_ga` (boolean)
- `maintains_permanent_abode_ga` (boolean)
- `retirement_income` (number)
- `tax_year` (integer)

### `compliance_evaluate_state_residency` (~169 tokens)

Compliance Evaluate State Residency

Evaluate individual statutory residency, domicile nexus, and state tax liability across all 50 US states and District of Columbia.

Input parameters:

- `age` (integer)
- `capital_gains` (number)
- `days_in_state` (integer, required)
- `federal_agi` (number)
- `filing_status` (string)
- `has_active_driver_license` (boolean)
- `has_active_homestead_exemption` (boolean)
- `has_active_voter_registration` (boolean)
- `is_domiciled` (boolean)
- `jurisdiction` (string, required)
- `maintains_permanent_abode` (boolean)
- `retirement_income` (number)
- `tax_year` (integer)
- `telecommuting_days_out_of_state` (integer)

## Diagnostics

Captured diagnostic sections: Provenance, Install scripts, Dependencies. The full working is on the page: https://verifymcp.io/servers/christianclaudio-taxcode/mcp-server-taxcode#diagnostics

## Score history

- 2026-10-18: 79
- 2026-10-17: 63
- 2026-10-16: 77
- 2026-10-15: 62
- 2026-10-14: 61
- 2026-10-13: 48

## Common questions

### What is the io.github.christianclaudio/taxcode MCP server?

io.github.christianclaudio/taxcode is an MCP server listed in the public MCP registry as io.github.christianclaudio/taxcode. MCP server for US Federal, territorial, and state tax law and compliance. This page covers its PyPI package (mcp-server-taxcode).

### Is the io.github.christianclaudio/taxcode MCP server safe to use?

io.github.christianclaudio/taxcode scores 79 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 18 October 2026. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the io.github.christianclaudio/taxcode MCP server expose?

io.github.christianclaudio/taxcode exposes 8 tools: system_get_health_status, statutes_lookup_statute, statutes_search_tax_code, statutes_list_publications, compliance_evaluate_pr_bona_fide_residency, and 3 more. Their descriptions and schemas cost roughly 1,062 tokens of context every time the server is loaded.

### Is the io.github.christianclaudio/taxcode MCP server still maintained?

io.github.christianclaudio/taxcode is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the io.github.christianclaudio/taxcode MCP server under?

io.github.christianclaudio/taxcode declares the Apache-2.0 licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- PyPI project: https://pypi.org/project/mcp-server-taxcode/
- Socket report: https://socket.dev/pypi/package/mcp-server-taxcode
- Repository: https://github.com/christianclaudio/mcp-server-taxcode
- Changelog RSS feed: https://verifymcp.io/servers/christianclaudio-taxcode/mcp-server-taxcode.xml
- Changelog JSON feed: https://verifymcp.io/servers/christianclaudio-taxcode/mcp-server-taxcode.json
- HTML version of this page: https://verifymcp.io/servers/christianclaudio-taxcode/mcp-server-taxcode