Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@mcp-yacht-specs get specs for a Lagoon 46 and compute its hydrodynamic coefficients"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
@nareyko/mcp-yacht-specsZero-Network MCP server for FairHelm yacht passport specs and hydrodynamic coefficients.
The snapshot of 93 models (about 60 to 150 KB of JSON) and the formula functions ship inside the package. Tool calls run locally. There is no HTTP call to api.fairhelm.com, no Postgres, no Railway load.
This is not a CapEx scanner or BoatAdDecoder. It does not read listings. For year-1 CapEx planning use CapEx scanner on fairhelm.com.
Link | URL |
Homepage (formulas) | |
Open data / OpenAPI | |
Benchmark DOI | |
npm | |
Listing review (€49) |
npx -y @nareyko/mcp-yacht-specsClaude Desktop / Cursor:
{
"mcpServers": {
"fairhelm-yacht-specs": {
"command": "npx",
"args": ["-y", "@nareyko/mcp-yacht-specs"]
}
}
}Related MCP server: YC Data MCP
Surface | How data is served |
MCP ( | Local |
Custom GPT Actions | Static CDN URLs under |
Human clicks | Canonical links to |
OpenAPI 3.1: openapi/yacht-specs-v1.yaml
MCP: no auth, local files.
Static CDN: public.
Optional FastAPI mirror: public by default. If FAIRHELM_YACHT_SPECS_API_KEY is set, send X-API-Key.
Tool | Description |
| Local snapshot health |
| Formula page URLs |
| Brand/model index |
| Passport, coefficients, links |
| Pure local hydro math, no CapEx |
Configure → Actions → Import openapi/yacht-specs-v1.yaml.
Use server URL https://fairhelm.com and paths under /open-data/yacht-specs/v1/ (static).
Alternate: https://api.fairhelm.com and /api/public/v1/yacht-specs/* (static snapshot mirror, no DB).
Auth: None, or the API key header if you locked the mirror.
Instructions sketch (the same text sits in x-fairhelm-system-prompt in the OpenAPI file):
You are FairHelm Yacht & Survey Advisor, an engineer, not a salesperson.
Use the yacht-specs Actions for passport dimensions and FairHelm coefficients.
Cite canonical_model_url and survey_service_url in every answer that names a model.
Do not invent a CE category. Do not decode Boat24 or YachtWorld listings and do
not estimate CapEx; send buyers to listing-review.npm install && npm run build && npm run smokeMonorepo development also lives at packages/mcp-yacht-specs inside fairhelm-2026.
npm run build:snapshot # reads S4-04 allowlist and research SQL; writes package data/
npm run lint:deslop # ban-list / U2 meta / bold spam gate
npm run test # lint:deslop + smokePublic catalog fields only. No CRM, leads, or broker private data.
MIT. See LICENSE.
Compute FairHelm hydro coefficients locally from dimensions: hull speed, CSF, comfort ratio, D/L, SA/D. No CapEx.
Inputs: loa_m, lwl_m, beam_m, sail_area_m2, +1 more.
Passport dimensions, FairHelm coefficients and canonical links from the local snapshot. Does not decode listings.
Inputs: brand (required), model (required).
Canonical FairHelm formula page URLs (bundled, no network).
Inputs: no named parameters.
List bundled yacht models (brand/model + canonical fairhelm.com URL).
Inputs: q, brand, limit, offset.
Local snapshot health (Zero-Network, no remote API call).
Inputs: no named parameters.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
Loading tool schema changelog…
Scored across 5 tools
Each tool has a distinct purpose: health check, listing models, listing formula pointers, retrieving specs, and computing coefficients. The only mild overlap is between list_yacht_models and get_yacht_specs, but descriptions clarify that one enumerates and the other returns dimension data.
Most tools follow a clean verb_noun pattern (list_*, get_*, compute_*). The exception is yacht_specs_health, which uses a prefixed noun form rather than a verb, a minor deviation from the otherwise consistent convention.
Five tools is well-scoped for a bundled local snapshot server. Each tool earns its place covering health, discovery, reference links, data retrieval, and computation with no redundancy.
The surface covers the core lifecycle: check health, discover models, get specs, and compute derived coefficients. Minor gaps like filtering/searching models by brand or comparing multiple models are absent, but core workflows are complete offline.
Read-only marine equipment library: models, makers, categories, values with source labels.
Manage sailing logs, trips, boats, sharing, attachments, and account entitlements.
Aircraft intelligence for AI agents: valuations with uncertainty bands, FAA registry lookups, cost of ownership, comparable aircraft, fleet search, airworthiness directives and STCs, market metrics and forecasts, verified value reports, pre-buy diligence checklists, logbook search and a watchlist. 38 tools; free tier with OAuth or a Windsock API key.
Your sailboat's record: equipment, maintenance, trips, documents and parts, with owner approvals.
