feat(circles): create_circle + add_member_to_circle (v0.7.0)

- acccreatefamily endpoint creates a new circle (returns numeric ID)
- accinvite endpoint invites new users by email (familyId, identifier, role, firstname)
- fw_client now detects a00.ex errors (was only checking a00.un before)
- New modules/circles.py with FamilyRoleTypeEnum constants
- SPEC.md updated with acccreatefamily, accinvite, accupdatefamily docs
- Note: circle deletion not supported by FW API (metadelete → "delete not supported")
- Note: accinvite only works for new (non-existing) FW accounts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -24,7 +24,7 @@ und wird in Claude Desktop eingebunden.
 
 ## Aktueller Stand
 
-### Implementierte Tools (v0.6.1)
+### Implementierte Tools (v0.7.0)
 
 | Kategorie | Tools |
 |---|---|
@@ -34,6 +34,7 @@ und wird in Claude Desktop eingebunden.
 | Kategorien | `create_category`, `delete_category` |
 | Aktivitäten | `like_post` |
 | Rezepte | `get_recipes`, `get_recipe`, `create_recipe`, `update_recipe`, `delete_recipe` |
+| Kreise | `create_circle`, `add_member_to_circle` |
 
 ## Roadmap
 
@@ -43,10 +44,11 @@ und wird in Claude Desktop eingebunden.
 - v0.5.2: Mengenkonvention im create_task Docstring ✓
 - v0.5.3: Kategorie-Auto-Assign-Hinweis im create_task Docstring ✓ (nachgeliefert in v0.6.1)
 - v0.6.0: Rezept-Box (get_recipes, get_recipe, create_recipe, delete_recipe) ✓
-- v0.6.1: update_recipe + Bugfix Zeilenumbrüche in create_recipe ✓ ← aktuell
+- v0.6.1: update_recipe + Bugfix Zeilenumbrüche in create_recipe ✓
-- v0.6.2: mpadditemtolist (Zutaten → Einkaufsliste)
+- v0.7.0: create_circle + add_member_to_circle ✓ ← aktuell
+- v0.7.1: mpadditemtolist (Zutaten → Einkaufsliste)
 - v0.5.3: update_list (Umbenennen, emoji/color ändern), Sharing-Verwaltung
-- v0.7.x: Erinnerungen + Wiederholungen (Premium-Account erforderlich)
+- v0.8.x: Erinnerungen + Wiederholungen (Premium-Account erforderlich)
 - v2.0: Schreibzugriff auf Wall-Posts (Erstellen, Kommentieren)
 
 
@@ -136,6 +138,9 @@ Fehler bei falschen Parametern kommen nicht immer auf Top-Level:
 | `mprecipeput` | `recipe.name`, `recipe.isRecipe="true"`, `recipe.description`, `recipe.ingredients`, `recipe.instructions`, `recipe.prepTime`, `recipe.cookTime`, `recipe.serves`, `recipe.url` | Alle mit `recipe.`-Prefix! |
 | `mprecipeput` (Update) | zusätzlich `recipe.metaId` | Vorhandene ID → Update statt Create |
 | `metasync` (Rezepte lesen) | `id="recipe"` | liefert `a00.r.r.updatedCreated[]` |
+| `acccreatefamily` | `name` | liefert numerische Kreis-ID als String in `a00.r.r` |
+| `accinvite` | `familyId`, `identifier`, `role="Unknown"`, `firstname` | nur für neue FW-Accounts |
+| `accupdatefamily` | `name` | aktualisiert immer den PRIMARY Kreis (ignoriert `id`/`familyId`) |
 
 ### Self-Like-Restriction
 Eigene Posts können nicht geliked werden. API antwortet 200, macht aber nichts.

README.md

@@ -2,7 +2,7 @@
 
 MCP server for [Family Wall](https://www.familywall.com) -- read and manage your family's circles, lists, tasks, and recipes directly from Claude.
 
-## Features (v0.6.1)
+## Features (v0.7.0)
 
 ### Read
 
@@ -29,6 +29,8 @@ MCP server for [Family Wall](https://www.familywall.com) -- read and manage your
 - `create_recipe` -- create a new recipe (name, description, ingredients, instructions, prep/cook time, serves, url); use `\n` to separate ingredient lines
 - `update_recipe` -- update any field of an existing recipe (partial update — omitted fields unchanged)
 - `delete_recipe` -- permanently delete a recipe (only own recipes)
+- `create_circle` -- create a new Family Wall circle (group); note: circles cannot be deleted via API
+- `add_member_to_circle` -- invite a person to a circle by e-mail (for new Family Wall users only; existing accounts require in-app invitation)
 
 ## Requirements
 

SPEC.md

@@ -491,11 +491,80 @@ a00.r.r                     → "true" (String)
 
 **Verifiziert am:** 2026-04-16 via FW_DEBUG=1
 
+### `acccreatefamily` – Kreis erstellen
+POST https://api.familywall.com/api/acccreatefamily
+
+**Body-Parameter:**
+
+| Parameter | Pflicht | Wert |
+|---|---|---|
+| `name` | ja | Kreis-Name |
+
+**Response:**
+```
+a00.r.r     → numerische Kreis-ID als String (z.B. "23447369")
+            → vollständige metaId: "family/" + id
+```
+
+**Hinweise:**
+- Der Server kapitalisiert den ersten Buchstaben des Namens.
+- Kreise können über die API nicht gelöscht werden (`metadelete` → "delete not supported").
+- Vollständige Kreisdaten (incl. Name) via `famlistfamily` im gleichen Session-Call abrufbar.
+
+**Verifiziert am:** 2026-04-16 via FW_DEBUG=1
+
+### `accinvite` – Mitglied einladen
+POST https://api.familywall.com/api/accinvite
+
+**Body-Parameter:**
+
+| Parameter | Pflicht | Wert |
+|---|---|---|
+| `familyId` | ja | Kreis-metaId (z.B. `"family/23447369"`) |
+| `identifier` | ja | E-Mail-Adresse des Eingeladenen |
+| `role` | ja | `"Unknown"` (einziger verifizierter Enum-Wert für `FamilyRoleTypeEnum`) |
+| `firstname` | ja | Vorname des Eingeladenen |
+
+**Einschränkung:** Der Endpoint funktioniert nur für Personen, die noch kein
+Family Wall-Konto haben. Bei bestehenden Accounts antwortet der Server mit:
+`"This api is now only used to create and invite an account with login only."`
+
+**Fehler-Struktur** (HTTP 200, aber Fehler unter `a00.ex`):**
+```json
+{"a00": {"ex": {"ex": {"FiZClassId": "17", "message": "..."}}}}
+```
+→ `fw_client.py` prüft `a00.ex` und wirft `FamilyWallError`.
+
+**Response (Erfolg):**
+```
+a00.r.r     → Einladungsobjekt (Struktur unbekannt, da nicht testbar mit Test-Account)
+```
+
+**Bekannte Enum-Werte für `role`:**
+- `"Unknown"` ✓ verifiziert
+- `"Parent"`, `"Child"` → `FamilyRoleTypeEnum` decode error
+
+**Verifiziert am:** 2026-04-16 via FW_DEBUG=1
+
+### `accupdatefamily` – Kreis umbenennen
+POST https://api.familywall.com/api/accupdatefamily
+
+**Body-Parameter:**
+
+| Parameter | Pflicht | Wert |
+|---|---|---|
+| `name` | ja | Neuer Kreis-Name |
+
+**Hinweis:** Aktualisiert immer den PRIMARY Kreis des Accounts (ignoriert `id`/`familyId` Parameter).
+
+**Verifiziert am:** 2026-04-16 via FW_DEBUG=1
+
 ## Offene Punkte
 
 - Unlike-Endpoint (Service Worker blockiert Analyse)
 - Erinnerungen (reminder) – nur Premium-Account
 - Wiederholungen (repeat) – nur Premium-Account
 - Sortierung von Kategorien via API
-- update_recipe (Rezept aktualisieren) – Endpoint: mprecipeput mit metaId
 - mpadditemtolist (Zutaten aus Rezept → Einkaufsliste)
+- Einladung bestehender FamilyWall-Nutzer (accinvite nur für neue Accounts)
+- Kreis-Delete-Endpoint (API: "delete not supported" für family-Objekte)

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "mcp-familywall"
-version = "0.6.1"
+version = "0.7.0"
 description = "MCP server for Family Wall — read your family's lists and tasks via Claude"
 readme = "README.md"
 requires-python = ">=3.12"

src/mcp_familywall/__init__.py

@@ -1 +1 @@
-__version__ = "0.6.1"
+__version__ = "0.7.0"

src/mcp_familywall/fw_client.py

@@ -185,12 +185,17 @@ class FamilyWallClient:
             msg = f"API error from {endpoint!r}: {error_data}"
             raise FamilyWallError(msg, response_data=body)
 
-        # Some endpoints (e.g. taskupdate2) return per-call errors nested under
+        # Some endpoints return per-call errors nested under a00.un.un or a00.ex.ex
-        # a00.un.un instead of top-level — detect and surface them.
+        # instead of top-level — detect and surface them.
         a00 = body.get("a00", {})
-        if isinstance(a00, dict) and "un" in a00:
+        if isinstance(a00, dict):
+            if "un" in a00:
                 nested = a00["un"]
                 msg = f"API error from {endpoint!r}: {nested}"
                 raise FamilyWallError(msg, response_data=body)
+            if "ex" in a00:
+                nested = a00["ex"]
+                msg = f"API error from {endpoint!r}: {nested}"
+                raise FamilyWallError(msg, response_data=body)
 
         return body

src/mcp_familywall/modules/circles.py

@@ -0,0 +1,10 @@
+"""Circle (family group) helpers for the Family Wall MCP server."""
+
+from __future__ import annotations
+
+# Valid family role types known to the Family Wall API (FamilyRoleTypeEnum).
+# Only "Unknown" has been verified to be accepted by accinvite.
+ROLE_UNKNOWN = "Unknown"
+
+# Default role used when inviting new members.
+DEFAULT_INVITE_ROLE = ROLE_UNKNOWN

src/mcp_familywall/server.py

@@ -10,6 +10,7 @@ from mcp.server.fastmcp import FastMCP
 
 from mcp_familywall.auth import get_credentials
 from mcp_familywall.fw_client import FamilyWallClient, FamilyWallError
+from mcp_familywall.modules.circles import DEFAULT_INVITE_ROLE
 from mcp_familywall.modules.lists import translate_name
 from mcp_familywall.modules.recipes import (
     build_create_params,
@@ -1051,6 +1052,155 @@ def delete_list(list_id: str) -> str:
     )
 
 
+# ---------------------------------------------------------------------------
+# Tool: create_circle
+# ---------------------------------------------------------------------------
+
+
+@mcp.tool()
+def create_circle(name: str) -> str:
+    """Create a new Family Wall circle (group).
+
+    IMPORTANT: Ask the user for confirmation before calling this tool.
+
+    A circle is a group of people who share content on Family Wall (e.g. a
+    family, a group of friends).  After creation the caller is automatically
+    added as the circle owner (SuperAdmin).
+
+    Note: Circle deletion is not supported by the Family Wall API.  Test
+    circles must be deleted manually in the Family Wall app settings.
+
+    Args:
+        name: Display name for the new circle (e.g. ``"Van Elst"``).
+
+    Returns:
+        JSON with ``{created, id, name}`` on success, or an error message.
+        The server may capitalise the first letter of the name.
+    """
+    try:
+        email, password = get_credentials()
+    except RuntimeError as exc:
+        return f"Error: {exc}"
+
+    try:
+        with FamilyWallClient() as client:
+            client.login(email, password)
+
+            # acccreatefamily returns only the numeric family ID.
+            data = client.call("acccreatefamily", {"name": name})
+            try:
+                numeric_id: str = data["a00"]["r"]["r"]
+                if not isinstance(numeric_id, str) or not numeric_id.isdigit():
+                    raise TypeError(f"expected numeric ID, got {numeric_id!r}")
+            except (KeyError, TypeError):
+                client.logout()
+                return json.dumps(
+                    {"warning": "Unexpected acccreatefamily response", "raw": data},
+                    ensure_ascii=False,
+                    indent=2,
+                )
+
+            circle_id = f"family/{numeric_id}"
+
+            # Read back the circle to obtain the server-stored (possibly
+            # capitalised) name in the same session.
+            canonical_name = name
+            try:
+                circles_data = client.call("famlistfamily")
+                raw_circles = circles_data.get("a00", {}).get("r", {}).get("r", []) or []
+                for c in raw_circles:
+                    if c.get("metaId") == circle_id:
+                        canonical_name = c.get("name", name)
+                        break
+            except FamilyWallError:
+                pass  # fallback: use caller-provided name
+
+            client.logout()
+    except FamilyWallError as exc:
+        return f"Error: Family Wall API error: {exc}"
+    except Exception as exc:
+        return f"Error: Connection error: {exc}"
+
+    return json.dumps(
+        {"created": True, "id": circle_id, "name": canonical_name},
+        ensure_ascii=False,
+        indent=2,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Tool: add_member_to_circle
+# ---------------------------------------------------------------------------
+
+
+@mcp.tool()
+def add_member_to_circle(
+    circle_id: str,
+    email: str,
+    firstname: str | None = None,
+) -> str:
+    """Invite a person to a Family Wall circle by e-mail.
+
+    IMPORTANT: Ask the user for confirmation before calling this tool.
+
+    Sends an invitation to the given e-mail address.  The recipient will
+    receive an e-mail with a link to join the circle.  If they already have a
+    Family Wall account they must accept the invitation via the app; if they
+    do not have an account yet one will be created during the acceptance flow.
+
+    Note: The Family Wall API ``accinvite`` endpoint is limited to inviting
+    people who do not yet have an active Family Wall account.  Inviting an
+    existing account holder returns an error from the server.
+
+    Args:
+        circle_id: Target circle metaId from ``get_circles``
+            (e.g. ``"family/23431854"``).
+        email: E-mail address of the person to invite.
+        firstname: First name of the invitee (used in the invitation e-mail).
+            When omitted the local part of the e-mail address is used as a
+            fallback (e.g. ``"john"`` from ``john.doe@example.com``).
+
+    Returns:
+        JSON success indicator or an error message.
+    """
+    if not email or "@" not in email:
+        return "Error: 'email' must be a valid e-mail address."
+
+    # Derive a sensible first-name fallback from the email local part.
+    if firstname is None:
+        local_part = email.split("@")[0]
+        firstname = local_part.split(".")[0].capitalize()
+
+    params: dict[str, Any] = {
+        "familyId": circle_id,
+        "identifier": email,
+        "role": DEFAULT_INVITE_ROLE,
+        "firstname": firstname,
+    }
+
+    try:
+        data = _authenticated_call("accinvite", params)
+    except RuntimeError as exc:
+        return f"Error: {exc}"
+
+    # On success the server returns the invitation object under a00.r.r.
+    try:
+        result_obj = data.get("a00", {}).get("r", {}).get("r")
+    except (AttributeError, TypeError):
+        result_obj = None
+
+    return json.dumps(
+        {
+            "invited": True,
+            "circle_id": circle_id,
+            "email": email,
+            "result": result_obj,
+        },
+        ensure_ascii=False,
+        indent=2,
+    )
+
+
 # ---------------------------------------------------------------------------
 # Tool: like_post
 # ---------------------------------------------------------------------------