Internal shared utilities for the @czagents/* MCP servers — IČO/DIČ validation, HTTP helpers, simple in-memory rate limiter, request-origin extraction, and billing primitives.

This is not an end-user MCP server. It is published to npm so the other @czagents/* packages can declare it as a dependency. You normally do not install it directly — npm install @czagents/ares (or any of the servers) pulls it in transitively.

Install

npm install @czagents/shared

API

Re-exported from the package root:

validateIcoInput(ico), isValidIco(ico) — IČO format + MOD11 checksum (Czech 7-8 digit Business ID)
formatDic(dic), isValidDic(dic), icoFromDic(dic) — DIČ (Czech VAT ID) helpers
httpGetJson(url, opts), httpGetText(url, opts) — small fetch wrapper with timeout + retry
RateLimiter — token-bucket rate limiter for stdio/HTTP MCP servers
getRequestOrigin(req) — extract origin metadata from MCP request context
Cache — minimal TTL cache used across the servers
billing/* — tier helpers (free / paid) and rate-limit policy types shared by the servers

Self-host

Source: https://github.com/martinhavel/cz-agents-mcp

git clone https://github.com/martinhavel/cz-agents-mcp
cd cz-agents-mcp
npm install
npm run build -w @czagents/shared

License

MIT — see LICENSE

Keywords

mcp

model-context-protocol

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Package last updated on 02 Jun 2026

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