OhMyWind

 ⟨434 unchanged words⟩  by
        2 km so harbours stay at sea, and any water a fine current atlas
        resolves counts as sea): a spit narrower than about 4 km ⟨674 unchanged words⟩ complexity, warnings)
        and offer ``openwind_url`` as the "View full plan →" link.

        ## ALWAYS include the openwind_url(s)link into youradjust te

 ⟨182 unchanged words⟩ departure" view, often after step 2.

        4. **Two ways to go** ("nord ou sud du Fromveur pour Ouessant ?",
           "par l'intérieur ou l'extérieur des Glénan ?", "Ré ou Aix
           demain ?"): one ``plan_passage`` call, the first route in
           ``waypoints`` and the others in ``alternatives`` (two at most),
           each with a short ``label`` saying how it goes ("Par le nord du
           Fromveur"). Every route is computed for the same departures, so
           the widget compares them cell by cell. Do not make one call per
           route.

        5. **When to be at a pass** ("à quelle heure au Raz de Sein ?",
           "quand renverse le courant au Fromveur ?"): ``get_tidal_stream``
           at the pass, with the course you will steer, and ``plan_passage``
           comparing departures, both in the same turn; then pick the
           departure that brings you there in the favourable window.

        6. **Methodology question** ("comment c'est calculé ?",
            ⟨39 unchanged words⟩ Waypoints must stay in the water

        This server doesruns noa coarse land check.check Itbefore samplesanything windelse: anda sealeg
        that alongruns the
        polylinea youcouple pass,of thenkilometres reportsover distanceland, ETAor anda complexitywaypoint forinland, thatgets
        polylinethe call refused before any forecast request, whateverwith the leg and the
        place named. Redraw it crosses.and Acall legagain; drawnnever throughshow the user a peninsularoute
        over raisesland. The shoreline is coarse (about 1 km, the coast widened by
        no2 error:km itso returnsharbours stay at sea): a passagespit narrower than about 4 km, or a
        leg that shaves a headland, passes the check and is timed as drawn,
        too short, too fast, and scored
         on conditions the boat would never 
        meet.

        So the route is still yours to draw. Between every consecutive pair of
         ⟨196 unchanged words⟩ a leg you drew wrong.

        ## Returned payload

        Every time comes back in the UTC offset of ``departure``: send the
        user's own (``+02:00`` for France in summer) and read the times as
        their clock.

        Single mode:

        - ``passage``: per-segment timing report  ⟨29 unchanged words⟩ same passage in the standalone web app.
        - ``waypoints``: the route as you sent it, which the widget draws on
          a map.
        - ``route_label`` and ``alternatives[]``, only when you passed
          alternatives: each alternative has its ``label``, ``waypoints``,
          ``passage``, ``complexity`` and ``openwind_url``.
        - ``disclaimer``: usage warning to relay (see below) ⟨20 unchanged words⟩  ``windows[]``: each entry has ``departure``, ``arrival``its ``weekday``,
          ``arrival``, ``duration_h``, ``distance_nm``, ``complexity`` (level 
          + label +
           rationale), ``conditions_summary`` (tws_min/max, 
          predominant sail
           angle, hs_min/max), ``warnings``, ``passage`` (fullthe per-segmentdifficulty
          report), ``complexity_full`` (full scorefirst), ``openwind_url``.
        - ``meta_warnings``: top-level notes about the whole sweep or the route ("3 
          fenêtres ignorées …", a long route sampled more sparsely).
        - ``notices`` / ``meta_notices````waypoints``: the same warningsroute as codesyou with
          theirsent valuesit, (``{"code":once "sweep.skipped_windows",for "params":all …}windows.
        - ``route_label`` and ``alternatives[]``),
          for a clientonly thatwhen saysyou thempassed
          alternatives: ineach anotheralternative language.has Readits the``label``, French``waypoints``
          ``message`` and ignoreits these.own ``windows[]``, same departures.
        - ``disclaimer``: usage warning to relay (see ⟨104 unchanged words⟩  response is automatically
        accompanied by an interactive widget: the live ohmywind.fr/plan view
        served via the 
        ``ui://openwind/plan-passage`` resource declared on
         this tool's 
        ``_meta``. TheIn widgetcompare-windows readsmode ``openwind_url``it fromlists the
        structured output and embedsdepartures; the matching plan view as an iframe.

        On hosts without MCPone
        the Appsuser supportselects (Cursor,the Leearliest Chat,at terminalfirst), present
        a shortdrives texta summarymap of the result (route, ETA, complexity, warnings)
        and offer ``openwind_url`` as the "Viewyou fulldrew, plancoloured →"by link.

        ##its ALWAYSwind, includeand theits openwind_url(s)per-leg indetail. yourIn textsingle
        mode reply

        Evenit whenshows the widget renders inlinefigures, the user wants the link spelled
        out so they canmap openand the full app, share it, orper-leg bookmarkdetail. it.The Treatuser
        this as a hard requirement, not a fallback:

        - **Single mode**: endsees your reply with a Markdown link built from the
          ``openwind_url`` field, e.g. ``[Voir le plan détaillé →](<openwind_url>)``.
          Alwayswaypoints useon that value verbatimmap, neverone amore URLreason youto composekeep yourself:every it
          pointsleg at the environment this server is configured for, which is not
          always the production site.
        - **Compare-windows mode**: list 2-4 of the most relevant windows
          and give each its own link, e.g.
          ``- Sam 2 mai 09h ·sea.

        On 11h12hosts ·without ⚡2/5MCP ·Apps [voirsupport →](url)``.
          The user picks one from the chatCursor, not the widget.

        Phrase the link with intent ("voir le planLe détaillé"Chat, "ouvrir cette
        fenêtre dans l'app"terminal), not just a bare URL: the user should knowpresent
        what clickinga does.

        ##short Args

            waypoints:text listsummary of ``{"lat": ..., "lon": ...}`` dicts, 2 to 50.
                Used exactly as drawn. Read "Waypoints must stay in the
                water" above before building it.
            departure: ISO-8601 datetime, timezone-aware.
            archetype: one of ``list_boat_archetypes()`` names.
            efficiency: multiplier on polar speed. ``0.85`` racing, ``0.75``
                cruisingresult (default)route, ``0.65`` loaded family cruisingETA, ``0.55``
                heavy seas / fouled hull.
            segment_length_nm: target sub-segment length. Default 10 nm
                balances precision vs Open-Meteo budget; drop to 5 for tight
                coastal workcomplexity, raise to 20 for long offshorewarnings)
        and legs.
            model:offer wind``openwind_url`` model.as Defaultthe ``"auto"`` tries AROMEView (≤48full h)plan →
                ICON-EU (≤5 d)" →link.

        ## ECMWFALWAYS IFSinclude 0.25°the openwind_url(≤10 ds) → GFSin (≤16your d).
                Passte

{"properties":{"alternatives":{"anyOf":[{"items":{"additionalProperties":true,"type":"object"},"type":"array"},{"type":"null"}],"default":null,"title":"Alternatives"},"archetype":{"title":"Archetype","type": ⟨10 unchanged words⟩ ":"Efficiency","type":"number"},"inland_waterway":{"default":false,"title":"Inland Waterway","type":"boolean"},"latest_departure":{"anyOf":[{"type":"string ⟨57 unchanged words⟩ "default":null,"title":"Motor Threshold Kn"},"route_label":{"anyOf":[{"type":"string"},{"type":"null"}],"default":null,"title":"Route Label"},"segment_length_nm":{"default":10,"title ⟨44 unchanged words⟩