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Verified locale data for AI agents: dates, phone, currency, tax, holidays, addresses (UK/US)
About
Verified locale data for AI agents: dates, phone, currency, tax, holidays, addresses (UK/US)
Security Report
localecheck is a well-structured locale-correctness library with clean MCP server implementations in both Python and TypeScript. No authentication mechanisms are required or expected (the server provides deterministic data lookups, not user-specific operations). Code quality is high with proper input validation, comprehensive test coverage, and reasonable error handling. Dependencies are legitimate and appropriate for the purpose. Minor code quality observations exist but do not constitute security vulnerabilities. Package verification found 1 issue.
8 files analyzed · 4 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
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How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-qinisolabs-localecheck": {
"args": [
"localecheck"
],
"command": "uvx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
localecheck
Locale-correctness tools for AI agents. Agents are systematically wrong about
everyday non-US data — they read 03/04 as March 4 in the UK, apply today's VAT
rate to a historical invoice, format €1,234.50 for a German reader, and miss
bank holidays in delivery dates. localecheck gives them verified answers and
flags impossible inputs instead of guessing.
Coverage: UK + USA (v1), expanding. Free, no API key.
Packages
| Package | Install | Use | |
|---|---|---|---|
| TypeScript (primary) | packages/localecheck-ts | npx -y localecheck (live on npm) | MCP server and importable library |
| Python | packages/localecheck-python | from source (PyPI release coming soon) | MCP server, importable library, REST API |
Both wrap the same authoritative libraries (libphonenumber, CLDR/Intl, date-holidays) and share the same hand-curated tax data.
What it does
parse_date · validate_phone · format_currency · tax_rate (VAT/sales-tax
by date) · is_holiday / next_holiday · parse_address
Quick start (in an AI app)
{ "mcpServers": { "localecheck": { "command": "npx", "args": ["-y", "localecheck"] } } }
Then ask naturally — the agent picks the tool: "A UK invoice dated 1 June 2009 — what VAT rate?" → 15%.
Repo map
packages/localecheck-ts— primary TypeScript package (MCP + library)packages/localecheck-python— Python package + FastAPI REST APIeval/— benchmark harness: how often raw LLMs get this wrongbenchmark.html— shareable results page ·BUSINESS_MODEL.md— strategy ·PUBLISH.md— release steps ·LOCAL_TEST.md— test before publishing
Status & caveats
UK VAT history is reliable for the modern era (standard rate). US state sales-tax values are 2025 state base rates (local taxes add on top) — verify against an authoritative feed before live invoicing. Addresses parse + extract a valid postcode/ZIP but don't verify deliverability.
Code: Apache-2.0. Curated tax data: see BUSINESS_MODEL.md.
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