feat: Add fields filter to appliance_list

Appliances list can be very large (hundreds of entries). Use
fields=["name","category"] to return only what the AI needs.

gns3server/api/routes/mcp/__init__.py

@@ -1171,9 +1171,11 @@ async def symbol_delete(
 
 
 @mcp.tool()
-async def appliance_list() -> list[dict[str, Any]]:
-    """List all available appliances (template library)."""
-    return await asyncio.to_thread(_run_handler_sync, get_appliances_handler, {})
+async def appliance_list(
+    fields: Annotated[list[str] | None, Field(description="Optional: return only these fields. e.g. [\"name\",\"category\"]. Available: name, category, description, vendor_name, product_name, status, availability, images, versions, tags, symbol, usage, builtin")] = None,
+) -> list[dict[str, Any]]:
+    """List all available appliances (template library). Use fields=[] to return only what you need."""
+    return await asyncio.to_thread(_run_handler_sync, get_appliances_handler, {"fields": fields} if fields else {})
 
 
 @mcp.tool()

gns3server/api/routes/mcp/appliances.py

@@ -40,9 +40,30 @@ def _get_connector(gns3_ctx: dict[str, Any]):
 
 # ── Tool handlers ──────────────────────────────────────────────────────────
 
+VALID_APPLIANCE_FIELDS = {
+    "appliance_id", "name", "category", "description", "vendor_name",
+    "vendor_url", "product_name", "product_url", "documentation_url",
+    "status", "availability", "maintainer", "usage", "symbol",
+    "images", "versions", "tags", "builtin",
+    "first_port_name", "port_name_format", "port_segment_size",
+    "linked_clone", "docker", "iou", "dynamips", "qemu",
+}
+
+
 def get_appliances_handler(params: dict[str, Any], gns3_ctx: dict[str, Any]) -> dict[str, Any]:
     conn = _get_connector(gns3_ctx)
     appliances = conn.http_call("get", f"{conn.base_url}/appliances").json()
+    fields = params.get("fields")
+    if fields:
+        if not isinstance(fields, list):
+            return {"error": "fields must be a list, e.g. [\"name\", \"category\"]"}
+        invalid = [f for f in fields if f not in VALID_APPLIANCE_FIELDS]
+        if invalid:
+            return {
+                "error": f"Unknown fields: {invalid}",
+                "available_fields": sorted(VALID_APPLIANCE_FIELDS),
+            }
+        appliances = [{k: a[k] for k in fields if k in a} for a in appliances]
     return {"appliances": appliances, "count": len(appliances)}