skatt-mcp: Instructions file for Claude Code

CLAUDE.md

skatt-mcp CLAUDE.md is an instructions file for Claude Code from ValiantEvers/skatt-mcp. It costs 2,318 tokens per session, scanned A, original, MIT.

Project instructions for skatt-mcp, a local server that performs Norwegian tax calculations for 2025. MCP is a standard way for an AI assistant to call external tools; this server runs over the local machine connection.

In plain words
What is it for?
Use it to set up, run, type-check, build, or verify the Norwegian tax-calculation server and its Claude connection.
Why use it?
It tells the agent where to find project status, how to build and check the server, and how to connect it to Claude. It also documents that calculations stay local.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is ValiantEvers/skatt-mcp's own configuration. It tells Claude Code how to work on skatt-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything skatt-mcp configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is import satser2025 from "../data/satser/2025.json" with { type: "json" };.

Reuse

Borrowing it

Nothing to install: this file belongs to ValiantEvers/skatt-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/ValiantEvers/skatt-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/ValiantEvers/skatt-mcp

Made for: Claude Code.

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Per session 2,318 This file is loaded in full into every session.
When invoked 2,318 The same file — it is already loaded in full.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.02318 $0.02318
Opus 5.5 $0.00927 $0.00927
Sonnet 5.5 $0.00464 $0.00464
Haiku 4.5 $0.00232 $0.00232

Measured 2mo ago against content hash 1ded15a803e3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skatt-mcp CLAUDE.md scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

- **`spawnSync(..., { encoding: 'utf-8' })` dobbel-koder UTF-8 på Windows** (via CP-1252). Løs med `encoding: 'buffer'` + `.toString('utf-8')`.
CLAUDE.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

skatt-mcp

Personlig MCP-server for norske skatteberegninger (2025). Kjører lokalt over stdio — ingen data forlater maskinen. Lar chat-Claude svare med faktiske tall, ikke generelle råd.


Status og handoff

Denne prosjektets løpende status, arkitektur-beslutninger, og anbefalte neste steg holdes oppdatert i: STATUS.md (i prosjektroten)

Les den filen først ved start av ny økt.


Oppsett og kjøring

npm install
npm run build          # tsc → dist/
npm run dev            # tsx src/server.ts (ingen rebuild)
npm run typecheck      # tsc --noEmit

# Verifiser at serveren svarer etter build (bruk cmd.exe, ikke PowerShell, på Windows):
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | node dist/server.js

Claude Desktop — config-fil: macOS ~/Library/Application Support/Claude/claude_desktop_config.json, Windows %APPDATA%\Claude\claude_desktop_config.json. Bruk en absolutt sti til dist/server.js (config-fila ekspanderer ikke ~/miljøvariabler):

{
  "mcpServers": {
    "skatt-mcp": {
      "command": "node",
      "args": ["/Users/<DITT-BRUKERNAVN>/projects/skatt-mcp/dist/server.js"]
    }
  }
}

Claude Code CLI: claude mcp add skatt-mcp -- node "$(pwd)/dist/server.js" (kjør fra prosjektroten).


Mappestruktur

skatt-mcp/
├── src/
│   ├── server.ts                    ← MCP-entry, registrerer alle verktøy + stdio-transport
│   ├── tools/                       ← ett verktøy per domene (inntekt, formue, aksjer, ask, fond, bolig, krypto, lovdata, import_nordnet) + felles.ts (delte hjelpere, 2026-07-04)
│   ├── lib/
│   │   ├── fifo.ts                  ← domene-nøytral FIFO-engine (brukt av aksjer + krypto)
│   │   └── csv-parsers/nordnet.ts   ← Nordnet CSV-parser (ren funksjon)
│   └── data/satser/{2025,2026}.json ← skattesatser med _meta-blokk (2026: vedtatt 2025-12-18, FORELØPIG skjermingsrente — forbehold vises i output)
├── data/lovdata-cache/              ← gitignored, lazy-cached lov-XML + paragraf-JSON
├── test-fixtures/nordnet/           ← syntetiske CSV-fixturer + build-fixtures.mjs
└── scripts/                         ← test-runners; snapshot-output gitignored

Read the full file on GitHub · 167 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 167 lines · 2,318 tokens per session scan A 1ded15a803e3

Subscribe to this mod's changes

skatt-mcp CLAUDE.md is an instructions file published in the GitHub repository ValiantEvers/skatt-mcp (1 stars, last pushed 1mo ago), licensed MIT. It adds 2,318 tokens to every session, about $0.0093 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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