diff --git a/OpenNest.FrontEnd.Tests/McpWholeJobTests.cs b/OpenNest.FrontEnd.Tests/McpWholeJobTests.cs
index 37b8f3b..fd0f033 100644
--- a/OpenNest.FrontEnd.Tests/McpWholeJobTests.cs
+++ b/OpenNest.FrontEnd.Tests/McpWholeJobTests.cs
@@ -38,6 +38,54 @@ public class McpWholeJobTests : IDisposable
         string engine, bool noNew = false, CancellationToken token = default) =>
         tools.AutoNestJob(plateIndex, names, quantities, engine, noNew, token);
 
+    [Fact]
+    public void AcceptedPricesAndRequirementsSurviveSaveWithoutLosingMetadata()
+    {
+        var session = Session();
+        session.Nest.Customer = "Cost customer";
+        session.Nest.Notes = "Keep these notes";
+        session.Nest.Units = Units.Inches;
+        session.Nest.SalvageRate = 0.25;
+        var output = new NestingTools(session).AutoNestJob(0, "A,B", "1,1", "Rectangles", sheets:
+            [new SheetStockInput { Width = 10, Length = 10, Quantity = 2, Cost = 50 },
+             new SheetStockInput { Width = 12, Length = 12, Quantity = 2, Cost = 7 }]);
+        Assert.Contains("Whole job complete", output);
+        Assert.Contains("gross total=7", output);
+        Assert.Contains("net score=7", output);
+        Assert.Contains("supplied-cost", output);
+        Assert.All(session.AllDrawings(), d => Assert.Equal(1, d.Quantity.Required));
+        var path = Path.Combine(directory, "priced.nest");
+        new InputTools(session).SaveNest(path);
+        var reopened = new NestReader(path).Read();
+        Assert.Equal("Cost customer", reopened.Customer);
+        Assert.Equal("Keep these notes", reopened.Notes);
+        Assert.Equal(Units.Inches, reopened.Units);
+        Assert.Equal(0.25, reopened.SalvageRate);
+        Assert.Equal(new[] { 50d, 7d }, reopened.PlateOptions.Select(o => o.Cost));
+        Assert.All(reopened.Drawings, d => Assert.Equal(1, d.Quantity.Required));
+        Assert.Equal(2, reopened.Plates.Sum(p => p.Parts.Count));
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData(0d)]
+    [InlineData(-1d)]
+    [InlineData(double.NaN)]
+    [InlineData(double.PositiveInfinity)]
+    public void InvalidCostsDoNotMutateSession(double? cost)
+    {
+        var session = Session();
+        var quantities = session.AllDrawings().Select(d => d.Quantity.Required).ToArray();
+        var output = new NestingTools(session).AutoNestJob(0, "A,B", "1,1", "Rectangles", sheets:
+            [new SheetStockInput { Width = 10, Length = 10, Quantity = 1, Cost = 5 },
+             new SheetStockInput { Width = 12, Length = 12, Quantity = 1, Cost = cost }]);
+        Assert.Contains("Error:", output);
+        Assert.Contains("sheets[1]", output);
+        Assert.Empty(session.GetPlate(0).Parts);
+        Assert.Empty(session.Nest.PlateOptions);
+        Assert.Equal(quantities, session.AllDrawings().Select(d => d.Quantity.Required));
+    }
+
     [Fact]
     public void FiniteSheetInputsReachEngineWithTemplateSettings()
     {
@@ -398,6 +446,7 @@ public class McpWholeJobTests : IDisposable
     public void CancellationAfterPluginIgnoresTokenDoesNotCommit()
     {
         var session = Session();
+        var required = session.AllDrawings().Select(d => d.Quantity.Required).ToArray();
         using var cts = new CancellationTokenSource();
         var engine = "JobCancel-" + Guid.NewGuid();
         NestingEngineRegistry.Register(engine, "cancels after solving", () => new CancelStub(cts));
@@ -406,6 +455,7 @@ public class McpWholeJobTests : IDisposable
         Assert.Single(session.AllPlates());
         Assert.Empty(session.GetPlate(0).Parts);
         Assert.All(session.Nest.Drawings, d => Assert.Equal(0, d.Quantity.Nested));
+        Assert.Equal(required, session.AllDrawings().Select(d => d.Quantity.Required));
     }
 
     private sealed class CancelStub(CancellationTokenSource source) : INestingEngine
diff --git a/OpenNest.Mcp/SheetStockInput.cs b/OpenNest.Mcp/SheetStockInput.cs
index 2ccf5cf..c7e9a70 100644
--- a/OpenNest.Mcp/SheetStockInput.cs
+++ b/OpenNest.Mcp/SheetStockInput.cs
@@ -3,6 +3,9 @@ namespace OpenNest.Mcp;
 /// <summary>Request-local physical inventory for one whole-job solve.</summary>
 public sealed class SheetStockInput
 {
+    /// <summary>Positive per-sheet cost in common units; omit on every row for area scoring.</summary>
+    public double? Cost { get; set; }
+
     public double Width { get; set; }
     public double Length { get; set; }
     public int Quantity { get; set; }
diff --git a/OpenNest.Mcp/Tools/InputTools.cs b/OpenNest.Mcp/Tools/InputTools.cs
index 096705b..3225d5f 100644
--- a/OpenNest.Mcp/Tools/InputTools.cs
+++ b/OpenNest.Mcp/Tools/InputTools.cs
@@ -69,8 +69,24 @@ namespace OpenNest.Mcp.Tools
             [Description("Name for the nest (optional)")] string name = null
         )
         {
-            var nest = new Nest();
-            nest.Name = name ?? Path.GetFileNameWithoutExtension(path);
+            var source = _session.Nest;
+            var nest = new Nest
+            {
+                Name = name ?? (string.IsNullOrWhiteSpace(source?.Name) ? Path.GetFileNameWithoutExtension(path) : source.Name),
+                Customer = source?.Customer ?? "",
+                Notes = source?.Notes ?? "",
+                AssistGas = source?.AssistGas ?? "",
+                Status = source?.Status ?? NestStatus.Quote,
+                MadeBy = source?.MadeBy ?? "",
+                Thickness = source?.Thickness ?? 0,
+                Material = source?.Material ?? new Material(),
+                Units = source?.Units ?? default,
+                DateCreated = source?.DateCreated ?? default,
+                DateLastModified = source?.DateLastModified ?? default,
+                PlateDefaults = source?.PlateDefaults ?? new Nest.PlateSettings(),
+                PlateOptions = source?.PlateOptions ?? new(),
+                SalvageRate = source?.SalvageRate ?? 0.5,
+            };
 
             foreach (var drawing in _session.AllDrawings())
                 nest.Drawings.Add(drawing);
diff --git a/OpenNest.Mcp/Tools/NestingTools.cs b/OpenNest.Mcp/Tools/NestingTools.cs
index 6ecfb12..39bf840 100644
--- a/OpenNest.Mcp/Tools/NestingTools.cs
+++ b/OpenNest.Mcp/Tools/NestingTools.cs
@@ -344,7 +344,7 @@ namespace OpenNest.Mcp.Tools
             [Description(JobEngines)] string engine = null,
             [Description("Use only already-created empty plates with matching dimensions and spacing; do not add sheets")] bool no_new_plates = false,
             CancellationToken cancellationToken = default,
-            [Description("Optional finite physical sheet stock: width, length and available quantity per size. Incompatible with no_new_plates.")] SheetStockInput[] sheets = null
+            [Description("Optional finite physical sheet stock: width, length, available quantity and optional positive per-sheet cost in common units. Specify costs for every row or omit all. Incompatible with no_new_plates.")] SheetStockInput[] sheets = null
         )
         {
             var template = _session.GetPlate(plateIndex);
@@ -429,6 +429,8 @@ namespace OpenNest.Mcp.Tools
             if (result.Plates.Count > limit)
                 return "Error: proposal exceeds the allowed sheet count. Nothing committed.";
 
+            var costSummary = NestCostSummary.FromAccepted(result);
+
             // Build the entire target map before attaching a single part. Indexes in a mixed
             // stock proposal are solver ordinals, not indexes into the session's empty plates.
             var usedTargets = new HashSet<Plate>(ReferenceEqualityComparer.Instance);
@@ -462,7 +464,18 @@ namespace OpenNest.Mcp.Tools
                     _session.Plates.Add(target);
                 target.Parts.AddRange(proposed.Parts);
             }
+            foreach (var item in parsed.items)
+                item.Drawing.Quantity.Required = item.Quantity;
+            if (sheets != null)
+            {
+                _session.Nest ??= new Nest();
+                _session.Nest.PlateOptions = offeredStock.stock.Select(s => new PlateOption
+                { Width = s.Size.Width, Length = s.Size.Length, Cost = s.Cost ?? 0 }).ToList();
+            }
             var lines = new StringBuilder();
+            lines.AppendLine($"Cost basis={costSummary.Basis}, gross total={costSummary.GrossTotal}, estimated salvage credit={costSummary.SalvageCredit}, net score={costSummary.NetScore}");
+            foreach (var usage in costSummary.Stock)
+                lines.AppendLine($"  {usage.StockId}: used={usage.Used}, supplied cost={usage.Cost?.ToString() ?? "unspecified"}, gross subtotal={usage.GrossSubtotal}");
             lines.AppendLine($"Whole job complete: {result.Plates.Count} sheet(s) placed, {targets.Count(t => t.created)} new sheet(s) created.");
             if (sheets != null)
             {
@@ -486,15 +499,20 @@ namespace OpenNest.Mcp.Tools
             if (sheets.Length == 0)
                 return (null, 0, "Error: sheets must contain at least one stock size. Nothing committed.");
             var stock = new List<NestPlateStock>(sheets.Length);
+            var priced = sheets.Any(s => s?.Cost != null);
             long total = 0;
             for (var i = 0; i < sheets.Length; i++)
             {
                 var row = sheets[i];
                 if (row == null || !double.IsFinite(row.Width) || !double.IsFinite(row.Length)
+                    || !double.IsFinite(row.Width * row.Length)
                     || row.Width <= 0 || row.Length <= 0 || row.Quantity <= 0
                     || row.Length <= template.EdgeSpacing.Left + template.EdgeSpacing.Right
                     || row.Width <= template.EdgeSpacing.Top + template.EdgeSpacing.Bottom)
                     return (null, 0, $"Error: sheets[{i}] requires finite positive usable dimensions and a positive physical quantity. Nothing committed.");
+                if (row.Cost is double cost && (!double.IsFinite(cost) || cost <= 0)
+                    || priced && row.Cost == null)
+                    return (null, 0, $"Error: sheets[{i}] requires a finite positive cost; specify costs on every row or omit all. Nothing committed.");
                 var duplicate = stock.FindIndex(s => s.Size.Width == row.Width && s.Size.Length == row.Length);
                 if (duplicate >= 0)
                     return (null, 0, $"Error: sheets[{i}] duplicates sheets[{duplicate}] size. Nothing committed.");
@@ -502,7 +520,7 @@ namespace OpenNest.Mcp.Tools
                 if (total > int.MaxValue)
                     return (null, 0, "Error: total sheet inventory exceeds the supported sheet limit. Nothing committed.");
                 stock.Add(new NestPlateStock($"stock-{i}", new Size(row.Width, row.Length), row.Quantity,
-                    template.PartSpacing, template.EdgeSpacing, template.Quadrant));
+                    template.PartSpacing, template.EdgeSpacing, template.Quadrant, row.Cost));
             }
             return (stock, total, null);
         }
diff --git a/docs/automatic-nesting.md b/docs/automatic-nesting.md
index dd69713..6cd8664 100644
--- a/docs/automatic-nesting.md
+++ b/docs/automatic-nesting.md
@@ -115,3 +115,15 @@ overflow fails instead of becoming a score.
 
 Returned nests preserve offered stock prices. These are cost-aware heuristics,
 not global cost optimizers; validation and fulfillment remain required.
+
+
+MCP `autonest_job` accepts optional `cost` on each `sheets` row, alongside `width`,
+`length` and positive finite `quantity`. Supply positive finite costs on every row
+or omit all costs. MCP continues to reject duplicate sizes and disables salvage.
+Its result reports the cost basis, used physical counts, supplied costs, gross
+subtotals, gross total, estimated salvage credit and net score for the proposal.
+
+An accepted MCP solve stores requested drawing quantities and offered stock prices;
+save/reopen preserves them and existing nest metadata, plate defaults and salvage
+settings. Rejected/cancelled proposals change neither requirements nor options.
+Inventory remains request-local; saved options are offers, not a purchase ledger.
diff --git a/docs/nest-file-format.md b/docs/nest-file-format.md
index 45c6f71..e6032eb 100644
--- a/docs/nest-file-format.md
+++ b/docs/nest-file-format.md
@@ -92,7 +92,10 @@ format version is required. Legacy zero cost means unspecified, not a free sheet
 Positive costs are generic per-sheet values in caller-consistent units. Solving
 requires all available options to be priced or all to be unspecified.
 
-API returned nests retain offered options, excluding rows with zero available
-quantity because `.nest` options do not retain inventory. Options are offers, not
-a per-sheet purchase ledger. API quote archives additionally retain request costs
-and validated proposal cost summaries; old archives load with `Costs == null`.
+Desktop and accepted MCP/API jobs retain offered options (API rows with zero available
+quantity are excluded because `.nest` options do not retain inventory). MCP save also preserves
+loaded job metadata, plate defaults and salvage settings, and accepted whole-job
+requirements are stored on drawings. Options do not persist finite inventory or
+associate a historical purchase price with each physical sheet. API quote archives
+additionally retain request costs and validated proposal cost summaries; old archives
+without summaries load with `Costs == null`.