@readystack/tax-year-constant-drift-lint

Tax Year Constant Drift

Finds the tax years, statutory limits, filing thresholds, rates and deadlines hardcoded in payroll and invoicing code - the constants an AI assistant completes from a year that has already passed.

Install

npx @readystack/tax-year-constant-drift-lint file

Node 18+. The same 26 rules as the VS Code extension, from a terminal or CI.

Free

• Check the file you have open, or only the lines you selected, against all 26 rules, with real line numbers and every rule message readable - no key, no sign-up, no upload.
• --rules lists every rule

With a licence ($29 once)

• The same 26 rules at a scale one open file cannot reach: every file in the workspace, re-run on every save, exported as CSV, JSON or HTML, written as a JSON report a CI job can fail the build on, and extended with your own rules.

@readystack/tax-year-constant-drift-lint --dir ./templates --report html --out report.html

An independent senior compliance consultant bills $150 to $300 an hour, and a CPA charges $200 to $450 an hour for business tax work, so one hour of either costs more than this tool.

Use from an AI agent (MCP)

Claude Code · Cursor · Windsurf · any MCP client - add to your MCP config:

{ "mcpServers": { "tax-year-constant-drift-lint": { "command": "npx", "args": ["-y", "@readystack/tax-year-constant-drift-lint", "--mcp"] } } }

Tools: check_text and check_file (free) · check_dir (licence). The agent gets every finding with the line number.

Use in CI

- name: Tax Year Constant Drift
  run: npx -y @readystack/tax-year-constant-drift-lint --dir . --ci

(container: docker run --rm -v "$PWD:/work" getreadystack/tax-year-constant-drift-lint --dir /work --ci)

The folder sweep, reports and CI mode need one licence — one payment, no subscription. Set READYSTACK_LICENSE=<key> or run --license <key> once.

Get a licence