CMS-0057 API Gate

14 rules read a FHIR CapabilityStatement against CMS-0057-F. A 2021 payer statement returned 6 blocking gaps - three of the four APIs missing - and 107 days left to 1 January 2027.

Install

npx @readystack/cms-0057-api-gate file

Node 18+. The same 14 rules as the VS Code extension, from a terminal or CI.

Free

• Open any FHIR CapabilityStatement and see every CMS-0057-F gap in the editor: all 14 rules, each with its API name and the days left to 1 January 2027. The sample 2021 payer statement returns 10 findings, 6 of them blocking gaps.
• --rules lists every rule

With a licence ($29 once)

• Export the same audit as a dated Markdown and CSV gap report, one row per gap with its CMS-0057-F citation, so the evidence leaves the editor and goes into the compliance file an auditor asks for.

@readystack/cms-0057-api-gate --dir ./templates --report html --out report.html

A payer interoperability readiness review from an interop consultancy is commonly quoted as a five-figure engagement.

Use from an AI agent (MCP)

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

{ "mcpServers": { "cms-0057-api-gate": { "command": "npx", "args": ["-y", "@readystack/cms-0057-api-gate", "--mcp"] } } }

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

Use in CI

- name: CMS-0057 API Gate
  run: npx -y @readystack/cms-0057-api-gate --dir . --ci

(container: docker run --rm -v "$PWD:/work" getreadystack/cms-0057-api-gate --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