refactor: Decouple MCP server from direct DB access

Replace direct EF Core/DbContext usage in MCP tools with HTTP calls
to the CutList.Web REST API via new ApiClient. Removes CutList.Web
project reference from MCP, adds Microsoft.Extensions.Http instead.

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

CutList.Mcp/ApiClient.cs

@@ -0,0 +1,214 @@
+using System.Net.Http.Json;
+
+namespace CutList.Mcp;
+
+/// <summary>
+/// Typed HTTP client for calling the CutList.Web REST API.
+/// </summary>
+public class ApiClient
+{
+    private readonly HttpClient _http;
+
+    public ApiClient(HttpClient http)
+    {
+        _http = http;
+    }
+
+    #region Suppliers
+
+    public async Task<List<ApiSupplierDto>> GetSuppliersAsync(bool includeInactive = false)
+    {
+        var url = $"api/suppliers?includeInactive={includeInactive}";
+        return await _http.GetFromJsonAsync<List<ApiSupplierDto>>(url) ?? [];
+    }
+
+    public async Task<ApiSupplierDto?> CreateSupplierAsync(string name, string? contactInfo, string? notes)
+    {
+        var response = await _http.PostAsJsonAsync("api/suppliers", new { Name = name, ContactInfo = contactInfo, Notes = notes });
+        response.EnsureSuccessStatusCode();
+        return await response.Content.ReadFromJsonAsync<ApiSupplierDto>();
+    }
+
+    #endregion
+
+    #region Materials
+
+    public async Task<List<ApiMaterialDto>> GetMaterialsAsync(string? shape = null, bool includeInactive = false)
+    {
+        var url = $"api/materials?includeInactive={includeInactive}";
+        if (!string.IsNullOrEmpty(shape))
+            url += $"&shape={Uri.EscapeDataString(shape)}";
+        return await _http.GetFromJsonAsync<List<ApiMaterialDto>>(url) ?? [];
+    }
+
+    public async Task<ApiMaterialDto?> CreateMaterialAsync(string shape, string? size, string? description,
+        string? type, string? grade, Dictionary<string, decimal>? dimensions)
+    {
+        var body = new
+        {
+            Shape = shape,
+            Size = size,
+            Description = description,
+            Type = type,
+            Grade = grade,
+            Dimensions = dimensions
+        };
+        var response = await _http.PostAsJsonAsync("api/materials", body);
+        if (response.StatusCode == System.Net.HttpStatusCode.Conflict)
+        {
+            var error = await response.Content.ReadAsStringAsync();
+            throw new ApiConflictException(error);
+        }
+        response.EnsureSuccessStatusCode();
+        return await response.Content.ReadFromJsonAsync<ApiMaterialDto>();
+    }
+
+    public async Task<List<ApiMaterialDto>> SearchMaterialsAsync(string shape, decimal targetValue, decimal tolerance)
+    {
+        var response = await _http.PostAsJsonAsync("api/materials/search", new
+        {
+            Shape = shape,
+            TargetValue = targetValue,
+            Tolerance = tolerance
+        });
+        response.EnsureSuccessStatusCode();
+        return await response.Content.ReadFromJsonAsync<List<ApiMaterialDto>>() ?? [];
+    }
+
+    #endregion
+
+    #region Stock Items
+
+    public async Task<List<ApiStockItemDto>> GetStockItemsAsync(int? materialId = null, bool includeInactive = false)
+    {
+        var url = $"api/stock-items?includeInactive={includeInactive}";
+        if (materialId.HasValue)
+            url += $"&materialId={materialId.Value}";
+        return await _http.GetFromJsonAsync<List<ApiStockItemDto>>(url) ?? [];
+    }
+
+    public async Task<ApiStockItemDto?> CreateStockItemAsync(int materialId, string length, string? name, int quantityOnHand, string? notes)
+    {
+        var body = new
+        {
+            MaterialId = materialId,
+            Length = length,
+            Name = name,
+            QuantityOnHand = quantityOnHand,
+            Notes = notes
+        };
+        var response = await _http.PostAsJsonAsync("api/stock-items", body);
+        if (response.StatusCode == System.Net.HttpStatusCode.Conflict)
+        {
+            var error = await response.Content.ReadAsStringAsync();
+            throw new ApiConflictException(error);
+        }
+        response.EnsureSuccessStatusCode();
+        return await response.Content.ReadFromJsonAsync<ApiStockItemDto>();
+    }
+
+    #endregion
+
+    #region Offerings
+
+    public async Task<List<ApiOfferingDto>> GetOfferingsForSupplierAsync(int supplierId)
+    {
+        return await _http.GetFromJsonAsync<List<ApiOfferingDto>>($"api/suppliers/{supplierId}/offerings") ?? [];
+    }
+
+    public async Task<List<ApiOfferingDto>> GetOfferingsForStockItemAsync(int stockItemId)
+    {
+        return await _http.GetFromJsonAsync<List<ApiOfferingDto>>($"api/stock-items/{stockItemId}/offerings") ?? [];
+    }
+
+    public async Task<ApiOfferingDto?> CreateOfferingAsync(int supplierId, int stockItemId,
+        string? partNumber, string? supplierDescription, decimal? price, string? notes)
+    {
+        var body = new
+        {
+            StockItemId = stockItemId,
+            PartNumber = partNumber,
+            SupplierDescription = supplierDescription,
+            Price = price,
+            Notes = notes
+        };
+        var response = await _http.PostAsJsonAsync($"api/suppliers/{supplierId}/offerings", body);
+        if (response.StatusCode == System.Net.HttpStatusCode.Conflict)
+        {
+            var error = await response.Content.ReadAsStringAsync();
+            throw new ApiConflictException(error);
+        }
+        response.EnsureSuccessStatusCode();
+        return await response.Content.ReadFromJsonAsync<ApiOfferingDto>();
+    }
+
+    #endregion
+}
+
+/// <summary>
+/// Thrown when the API returns 409 Conflict (duplicate resource).
+/// </summary>
+public class ApiConflictException : Exception
+{
+    public ApiConflictException(string message) : base(message) { }
+}
+
+#region API Response DTOs
+
+public class ApiSupplierDto
+{
+    public int Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string? ContactInfo { get; set; }
+    public string? Notes { get; set; }
+    public bool IsActive { get; set; }
+}
+
+public class ApiMaterialDto
+{
+    public int Id { get; set; }
+    public string Shape { get; set; } = string.Empty;
+    public string Type { get; set; } = string.Empty;
+    public string? Grade { get; set; }
+    public string Size { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public bool IsActive { get; set; }
+    public ApiMaterialDimensionsDto? Dimensions { get; set; }
+}
+
+public class ApiMaterialDimensionsDto
+{
+    public string DimensionType { get; set; } = string.Empty;
+    public Dictionary<string, decimal> Values { get; set; } = new();
+}
+
+public class ApiStockItemDto
+{
+    public int Id { get; set; }
+    public int MaterialId { get; set; }
+    public string MaterialName { get; set; } = string.Empty;
+    public decimal LengthInches { get; set; }
+    public string LengthFormatted { get; set; } = string.Empty;
+    public string? Name { get; set; }
+    public int QuantityOnHand { get; set; }
+    public string? Notes { get; set; }
+    public bool IsActive { get; set; }
+}
+
+public class ApiOfferingDto
+{
+    public int Id { get; set; }
+    public int SupplierId { get; set; }
+    public string? SupplierName { get; set; }
+    public int StockItemId { get; set; }
+    public string? MaterialName { get; set; }
+    public decimal? LengthInches { get; set; }
+    public string? LengthFormatted { get; set; }
+    public string? PartNumber { get; set; }
+    public string? SupplierDescription { get; set; }
+    public decimal? Price { get; set; }
+    public string? Notes { get; set; }
+    public bool IsActive { get; set; }
+}
+
+#endregion

CutList.Mcp/CutList.Mcp.csproj

@@ -2,11 +2,11 @@
 
   <ItemGroup>
     <ProjectReference Include="..\CutList.Core\CutList.Core.csproj" />
-    <ProjectReference Include="..\CutList.Web\CutList.Web.csproj" />
   </ItemGroup>
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.2" />
+    <PackageReference Include="Microsoft.Extensions.Http" Version="9.0.4" />
     <PackageReference Include="ModelContextProtocol" Version="0.7.0-preview.1" />
   </ItemGroup>
 

CutList.Mcp/Program.cs

@@ -1,14 +1,15 @@
-using CutList.Web.Data;
-using Microsoft.EntityFrameworkCore;
+using CutList.Mcp;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using ModelContextProtocol.Server;
 
 var builder = Host.CreateApplicationBuilder(args);
 
-// Add DbContext for inventory tools
-builder.Services.AddDbContext<ApplicationDbContext>(options =>
-    options.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=CutListDb;Trusted_Connection=True;MultipleActiveResultSets=true"));
+// Register HttpClient for API calls to CutList.Web
+builder.Services.AddHttpClient<ApiClient>(client =>
+{
+    client.BaseAddress = new Uri("http://localhost:5009");
+});
 
 builder.Services
     .AddMcpServer()