# io.github.theluckystrike/tax-calc (mcpb · tax-calc.mcpb)

US federal income tax estimates: brackets, marginal rate, effective rate. Planning values.

- Trust score: 52/100 (low)
- Change this week: +36
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- mcpb · `tax-calc.mcpb`: 52/100 (this document), [markdown](https://verifymcp.io/servers/theluckystrike-tax-calc/https-github-com-theluckystrike-mcp-servers-releases-download-v0-22-0-tax-calc-m.md), [page](https://verifymcp.io/servers/theluckystrike-tax-calc/https-github-com-theluckystrike-mcp-servers-releases-download-v0-22-0-tax-calc-m)

## Channel facts

- Registry: `mcpb`
- Package: `https://github.com/theluckystrike/mcp-servers/releases/download/v0.22.0/tax-calc.mcpb`
- Version: `1.0.1`
- Transport: `stdio`
- SHA-256: `25e7ab4b8f75486b800e3f01c5ce67ee84dd2fbd9bef7ffcc3b9a9711b91ef6b`

## 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**: 23/100
  - No malware scan is available for this kind of package: the supply-chain vendors we use do not cover it. This is a permanent gap in our coverage, not a finding about the package.
  - Known CVEs were checked across the 88 of 88 dependencies we could resolve, so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - 32 of 88 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 30 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 37 tokens (~37/item across 1 items; 1 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 70/100
  - Stability observed for 21 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 67/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 1 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the io.github.theluckystrike/tax-calc MCP server?

io.github.theluckystrike/tax-calc ships as an MCPB bundle, a single file you download and open in an MCP host that supports MCPB bundles, such as Claude Desktop. The host reads the launch command from the bundle's own manifest, so there is no command to copy. Before opening it, check the file's SHA-256 matches the one the MCP registry declares for it, 25e7ab4b8f75486b800e3f01c5ce67ee84dd2fbd9bef7ffcc3b9a9711b91ef6b; the commands to do that are on this page. If it does not match, do not open it.

- Download bundle: `https://github.com/theluckystrike/mcp-servers/releases/download/v0.22.0/tax-calc.mcpb`
- SHA-256: `25e7ab4b8f75486b800e3f01c5ce67ee84dd2fbd9bef7ffcc3b9a9711b91ef6b`

### Verify on macOS / Linux

```bash
echo "25e7ab4b8f75486b800e3f01c5ce67ee84dd2fbd9bef7ffcc3b9a9711b91ef6b  tax-calc.mcpb" | shasum -a 256 -c
```

### Verify on Windows (PowerShell)

```powershell
(Get-FileHash -Algorithm SHA256 .\tax-calc.mcpb).Hash -eq "25e7ab4b8f75486b800e3f01c5ce67ee84dd2fbd9bef7ffcc3b9a9711b91ef6b"
```

## 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 52, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-16 (score 51, +1)

No change was recorded against any check on this day. Stability & Change Management went from 60 to 63. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 19 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-15 (score 50, +34)

- [security improvement] Injection markers: unverified → pass
- [functional regression] MCP protocol: unverified → fail
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] Stability: unverified → 0.60

### 2026-10-12 (score 16, 0)

- [functional] Package version: 0.22.0 → 1.0.1

### 2026-10-10 (score 16, −31)

- [security regression] Tool safety: pass → unverified
- [security regression] Stability: 0.33 → unverified
- [functional regression] Capabilities: fail → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified
- [functional] Package version: 0.22.0 → 1.0.1

### 2026-10-07 (score 47, +5)

- [functional improvement] Stability: unverified → 0.33

### 2026-09-28 (score 42, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-27 (score 42)

First indexed and scored.

## MCP tools (1)

### `us_federal_tax` (~37 tokens)

Estimate 2026 US federal income tax (single filer, standard deduction): gross annual income.

Input parameters:

- `gross_income` (number, required)

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/theluckystrike-tax-calc/https-github-com-theluckystrike-mcp-servers-releases-download-v0-22-0-tax-calc-m#diagnostics

## Score history

- 2026-10-18: 52
- 2026-10-17: 51
- 2026-10-16: 51
- 2026-10-15: 50
- 2026-10-14: 16
- 2026-10-13: 16
- 2026-10-12: 16
- 2026-10-10: 16
- 2026-10-07: 47
- 2026-10-04: 42
- 2026-10-03: 42
- 2026-10-02: 42
- 2026-10-01: 42
- 2026-09-30: 42
- 2026-09-29: 42
- 2026-09-28: 42
- 2026-09-27: 42

## Common questions

### What is the io.github.theluckystrike/tax-calc MCP server?

io.github.theluckystrike/tax-calc is an MCP server listed in the public MCP registry as io.github.theluckystrike/tax-calc. US federal income tax estimates: brackets, marginal rate, effective rate. Planning values. This page covers its MCPB bundle (https://github.com/theluckystrike/mcp-servers/releases/download/v0.22.0/tax-calc.mcpb).

### Is the io.github.theluckystrike/tax-calc MCP server safe to use?

io.github.theluckystrike/tax-calc scores 52 out of 100 on VerifyMCP. It declares no install or post-install scripts. 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.theluckystrike/tax-calc MCP server expose?

io.github.theluckystrike/tax-calc exposes 1 tool: us_federal_tax. Their descriptions and schemas cost roughly 37 tokens of context every time the server is loaded.

### What licence is the io.github.theluckystrike/tax-calc MCP server under?

io.github.theluckystrike/tax-calc declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- Repository: https://github.com/theluckystrike/mcp-servers
- Changelog RSS feed: https://verifymcp.io/servers/theluckystrike-tax-calc/https-github-com-theluckystrike-mcp-servers-releases-download-v0-22-0-tax-calc-m.xml
- Changelog JSON feed: https://verifymcp.io/servers/theluckystrike-tax-calc/https-github-com-theluckystrike-mcp-servers-releases-download-v0-22-0-tax-calc-m.json
- HTML version of this page: https://verifymcp.io/servers/theluckystrike-tax-calc/https-github-com-theluckystrike-mcp-servers-releases-download-v0-22-0-tax-calc-m