erikdarlingdata · erikdarlingdata · Aug 3, 2026 · Aug 3, 2026
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
@@ -18,15 +18,6 @@ updates:
       nuget:
         patterns:
           - "*"
-    ignore:
-      # The MCP SDK 2.x major changes runtime behavior on both MCP hosts (stateless-by-default
-      # HTTP, discovery-first negotiation, deprecated Roots/Sampling/Logging APIs) and must move
-      # in every referencing project + lockfile at once — a grouped auto-bump half-applied it and
-      # poisoned the whole group (#1822). Majors are taken deliberately via #1990; minors/patches
-      # keep flowing. Remove this once #1990 lands.
-      - dependency-name: "ModelContextProtocol*"
-        update-types: ["version-update:semver-major"]
-
   # GitHub Actions used by the workflows in .github/workflows.
   - package-ecosystem: "github-actions"
     directory: "/"

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -79,6 +79,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- **Both MCP hosts move to ModelContextProtocol SDK 2.0 (the MCP 2026-07-28 specification)** ([#1990]) - taken deliberately rather than riding a routine bump, because the 1.x-to-2.x major changes HTTP transport behavior and a grouped auto-bump had already demonstrated the failure mode (half-applied across projects, poisoning every lockfile - [#1822]). The version moves in every referencing project in one commit (shared Common, Lite, the Darling service, the deprecated Dashboard) with all lockfiles regenerated together under the CI-pinned SDK. **No code changes were needed**: 2.0's headline behavior switch - stateless-by-default HTTP - is a no-op here because both hosts have run \`Stateless = true\` explicitly since [#1074] (clients that don't echo \`Mcp-Session-Id\` otherwise connect but list zero tools), and the deprecated-API audit (Roots/Sampling/Logging) found no usage in either host or the shared tool plumbing. The Host-header/bearer/CIDR guards install ahead of \`MapMcp\` as pipeline middleware, so 2.0's discovery-first endpoint surface routes through the same checks - verified live against the SDK 2.0 host: initialize/tools-list/tools-call succeed statelessly and a non-loopback Host is still rejected before any handler. The SDK 2.0 surface was additionally validated end-to-end on Performance Studio's identical hosting stack before this migration. With the major taken, the Dependabot ignore rule that deferred \`ModelContextProtocol*\` majors to this issue is removed, so future SDK patches and minors resume flowing through the weekly group.
+
 - **`get_analysis_findings` now returns one entry per diagnostic chain instead of one per engine cycle - a 24h read shrinks ~28x** ([#2000], found dogfooding the MCP surface on the 52-replica production monitor) - the analysis engine re-persists the same stories every cycle, so a multi-hour read returned each chain dozens of times, every occurrence re-carrying the full advice prose and copy-paste remediation command: measured fleet-wide, 21,623 rows in 24 hours collapse to 774 distinct (story, incident) chains - 27.9x mean duplication, 39x on the worst server, ~257KB for a single server's 10-hour read. Both MCP twins (and Darling's web API bridge) now group by `story_path_hash` + `incident_id` and return the chain's LATEST occurrence - value-bearing advice is frozen at analysis time, so latest is current truth - plus the stats that replace the collapsed timeline: `occurrences`, `first_seen`, `last_seen`, and `peak_severity`, which matter because severity genuinely moves within a chain (275 of the 774 measured groups spread more than 0.1). `finding_count` counts deduplicated chains and a new `total_occurrences` reports the raw rows, so the compression is visible rather than silent. The read also stops being quietly WRONG at depth: the store read's row cap of 100 covered only the ~5 most recent cycles of a 24h request and silently dropped the rest, so the findings tools now pass a window-covering cap sized for the deepest legal read - occurrence stats computed over a truncated read would lie about `first_seen` - and a read that ever FILLS that cap says so in a `truncation_note` instead of under-reporting silently. The store keeps every occurrence; nothing changes for viewer timelines or what is persisted.
 
 - **Memory-pressure anomalies no longer fire on healthy servers with young baselines** ([#1996], found dogfooding the robust-baselines nightly on the 52-replica production monitor) - every server on the fleet reported the same self-contradicting finding, "Memory pressure spiked to 100% - 0σ above its 100% baseline for this time of week", 1,279 times across two eras. The mechanism, proven against the store rather than guessed: memory's absolute-fallback bar sat at 95%, BELOW the metric's healthy operating value - a warmed-up SQL Server holds total ≈ target = 100% by design, and the fleet's median is exactly 100.0 on every server - so whenever a baseline bucket was too young to trust (403 of 406 firing buckets had exactly 2 distinct days, one under the Full tier's floor of 3, with ~82 samples each), the untrustworthy-baseline path fired the absolute bar on completely normal behavior and displayed the honest-but-absurd 0σ. The bar moves to 101: total EXCEEDING target is genuine over-target pressure and still fires; total sitting at target stays silent however thin the baseline. Pre-existing (identical findings before the robust upgrade), young-store-shaped (it would have faded as buckets crossed the day floor, then returned with every new server), and exactly the class of thing the dogfood loop exists to catch - the finding volume was the single largest noise source on the MCP surface, 31 of the busiest tenant's latest 100 findings.
@@ -2473,3 +2475,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [#1606]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/1606
 [#1996]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/1996
 [#2000]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/2000
+[#1074]: https://github.com/erikdarlingdata/PerformanceMonitor/issues/1074
diff --git a/Darling/Darling.Tests/packages.lock.json b/Darling/Darling.Tests/packages.lock.json
@@ -116,15 +116,15 @@
       },
       "Microsoft.Extensions.AI.Abstractions": {
         "type": "Transitive",
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+        "resolved": "10.8.3",
+        "contentHash": "K0B05oApxmviWalNHPMBBcRC7erKiDATz3ENNR/jqTR9JwIwLRefgDhj2jCRwL1aca99pXUe0qyQC73/xIuZig=="
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       "Microsoft.Extensions.Caching.Abstractions": {
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+        "resolved": "10.0.10",
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         "dependencies": {
-          "Microsoft.Extensions.Primitives": "10.0.7"
+          "Microsoft.Extensions.Primitives": "10.0.10"
         }
       },
       "Microsoft.Extensions.Caching.Memory": {
@@ -386,7 +386,8 @@
           "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.10",
           "Microsoft.Extensions.Logging": "10.0.10",
           "Microsoft.Extensions.Logging.Abstractions": "10.0.10",
-          "Microsoft.Extensions.Options": "10.0.10"
+          "Microsoft.Extensions.Options": "10.0.10",
+          "System.Diagnostics.EventLog": "10.0.10"
         }
       },
       "Microsoft.Extensions.Logging.EventSource": {
@@ -529,29 +530,29 @@
       },
       "ModelContextProtocol": {
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-        "contentHash": "mP5hvBpoWe5EbWBqHWD09A4Dy6Pq+/vV2dumOV4uegCZcg+yqf8q8wrxtuZ3EQyXEJn9jzsnoiI/qyfJAihlZQ==",
+        "resolved": "2.0.0",
+        "contentHash": "X/KDNZDP9Zgs7YXXxxpKiDMWWPXYrs764lVgc6vEM4pCg87bYz4VaceeiKW91XDTGgUvIbmRYXgWqyNpV32xRg==",
         "dependencies": {
-          "Microsoft.Extensions.Caching.Abstractions": "10.0.7",
-          "Microsoft.Extensions.Hosting.Abstractions": "10.0.7",
-          "ModelContextProtocol.Core": "1.4.1"
+          "Microsoft.Extensions.Caching.Abstractions": "10.0.10",
+          "Microsoft.Extensions.Hosting.Abstractions": "10.0.10",
+          "ModelContextProtocol.Core": "[2.0.0]"
         }
       },
       "ModelContextProtocol.AspNetCore": {
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+        "resolved": "2.0.0",
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         "dependencies": {
-          "ModelContextProtocol": "1.4.1"
+          "ModelContextProtocol": "[2.0.0]"
         }
       },
       "ModelContextProtocol.Core": {
         "type": "Transitive",
-        "resolved": "1.4.1",
-        "contentHash": "G/hOBZkJsvF3MSy0sOvXdxca5uRe2Sb4xk7xRuTWNZI45khVBjOLo6nSzGilctIICavNVxbxUF908fLYI9RxkQ==",
+        "resolved": "2.0.0",
+        "contentHash": "piFR0HtA/2Oc1tgk96EE5Tye6qA2sg3WGRAXBhUqo/BWikdEYEs2UuqtmwLrQZJUge1nUOPgGHYsb15VIBK8iw==",
         "dependencies": {
-          "Microsoft.Extensions.AI.Abstractions": "10.5.2",
-          "Microsoft.Extensions.Logging.Abstractions": "10.0.7"
+          "Microsoft.Extensions.AI.Abstractions": "10.8.3",
+          "Microsoft.Extensions.Logging.Abstractions": "10.0.10"
         }
       },
       "Npgsql": {
@@ -732,6 +733,11 @@
           "SkiaSharp.Views.Desktop.Common": "3.119.0"
         }
       },
+      "System.Diagnostics.EventLog": {
+        "type": "Transitive",
+        "resolved": "10.0.10",
+        "contentHash": "OvGz3PrzuAI/Sj7LTcXcCe3FClRI1IyRMZjNONcZtFh+Ww7nAtSh4kh08r8KVe/xxkXJPjR0Y1jF7H+N42d4xQ=="
+      },
       "System.IdentityModel.Tokens.Jwt": {
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@@ -746,10 +752,18 @@
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       },
+      "System.Security.Cryptography.ProtectedData": {
+        "type": "Transitive",
+        "resolved": "10.0.10",
+        "contentHash": "BKt0SQgq2lq3ESE68jkeLwv95ypANrPDtkTOIFGcnhg2aRUeUUBDrQlkVDZctrg1WenVcvn5P5XZnuYI7q6rFQ=="
+      },
       "System.ServiceProcess.ServiceController": {
         "type": "Transitive",
         "resolved": "10.0.10",
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+        "dependencies": {
+          "System.Diagnostics.EventLog": "10.0.10"
+        }
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       "Velopack": {
         "type": "Transitive",
@@ -840,7 +854,7 @@
         "dependencies": {
           "CredentialManagement": "[1.0.2, )",
           "Microsoft.Extensions.Logging.Abstractions": "[10.0.10, )",
-          "ModelContextProtocol": "[1.4.1, )"
+          "ModelContextProtocol": "[2.0.0, )"
         }
       },
       "performancemonitor.darling.analysis": {
@@ -860,15 +874,16 @@
           "Microsoft.Data.SqlClient": "[7.0.2, )",
           "Microsoft.Extensions.Hosting": "[10.0.10, )",
           "Microsoft.Extensions.Hosting.WindowsServices": "[10.0.10, )",
-          "ModelContextProtocol": "[1.4.1, )",
-          "ModelContextProtocol.AspNetCore": "[1.4.1, )",
+          "ModelContextProtocol": "[2.0.0, )",
+          "ModelContextProtocol.AspNetCore": "[2.0.0, )",
           "PerformanceMonitor.Alerting": "[1.0.0, )",
           "PerformanceMonitor.Collectors": "[1.0.0, )",
           "PerformanceMonitor.Common": "[1.0.0, )",
           "PerformanceMonitor.Darling.Analysis": "[1.0.0, )",
           "PerformanceMonitor.Darling.Storage": "[1.0.0, )",
           "PerformanceMonitor.PlanAnalysis": "[1.0.0, )",
-          "System.IO.FileSystem.AccessControl": "[5.0.0, )"
+          "System.IO.FileSystem.AccessControl": "[5.0.0, )",
+          "System.Security.Cryptography.ProtectedData": "[10.0.10, )"
         }
       },
       "performancemonitor.darling.storage": {

diff --git a/Darling/PerformanceMonitor.Darling.Service/PerformanceMonitor.Darling.Service.csproj b/Darling/PerformanceMonitor.Darling.Service/PerformanceMonitor.Darling.Service.csproj
@@ -29,8 +29,8 @@
     <!-- AN4: the analysis MCP tools over Streamable HTTP — Lite's exact MCP stack/version.
          The AspNetCore package brings the Microsoft.AspNetCore.App framework reference
          (Kestrel/WebApplication) transitively, same as it does for Lite. -->
-    <PackageReference Include="ModelContextProtocol" Version="1.4.1" />
-    <PackageReference Include="ModelContextProtocol.AspNetCore" Version="1.4.1" />
+    <PackageReference Include="ModelContextProtocol" Version="2.0.0" />
+    <PackageReference Include="ModelContextProtocol.AspNetCore" Version="2.0.0" />
   </ItemGroup>
 
   <ItemGroup>

diff --git a/Darling/PerformanceMonitor.Darling.Viewer/packages.lock.json b/Darling/PerformanceMonitor.Darling.Viewer/packages.lock.json
@@ -95,15 +95,15 @@
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+          "Microsoft.Extensions.Primitives": "10.0.10"
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       "Microsoft.Extensions.Caching.Memory": {
@@ -120,10 +120,10 @@
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+          "Microsoft.Extensions.Primitives": "10.0.10"
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@@ -133,31 +133,31 @@
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-          "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.7",
-          "Microsoft.Extensions.Options": "10.0.7"
+          "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.10",
+          "Microsoft.Extensions.Options": "10.0.10"
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+          "Microsoft.Extensions.Primitives": "10.0.10"
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-          "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.7",
-          "Microsoft.Extensions.Diagnostics.Abstractions": "10.0.7",
-          "Microsoft.Extensions.FileProviders.Abstractions": "10.0.7",
-          "Microsoft.Extensions.Logging.Abstractions": "10.0.7"
+          "Microsoft.Extensions.Configuration.Abstractions": "10.0.10",
+          "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.10",
+          "Microsoft.Extensions.Diagnostics.Abstractions": "10.0.10",
+          "Microsoft.Extensions.FileProviders.Abstractions": "10.0.10",
+          "Microsoft.Extensions.Logging.Abstractions": "10.0.10"
         }
       },
       "Microsoft.Extensions.Logging.Abstractions": {
@@ -170,17 +170,17 @@
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         "dependencies": {
-          "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.7",
-          "Microsoft.Extensions.Primitives": "10.0.7"
+          "Microsoft.Extensions.DependencyInjection.Abstractions": "10.0.10",
+          "Microsoft.Extensions.Primitives": "10.0.10"
         }
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       "Microsoft.Extensions.Primitives": {
         "type": "Transitive",
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       },
       "Microsoft.IdentityModel.Abstractions": {
         "type": "Transitive",
@@ -236,21 +236,21 @@
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-          "Microsoft.Extensions.Hosting.Abstractions": "10.0.7",
-          "ModelContextProtocol.Core": "1.4.1"
+          "Microsoft.Extensions.Caching.Abstractions": "10.0.10",
+          "Microsoft.Extensions.Hosting.Abstractions": "10.0.10",
+          "ModelContextProtocol.Core": "[2.0.0]"
         }
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       "ModelContextProtocol.Core": {
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+        "resolved": "2.0.0",
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         "dependencies": {
-          "Microsoft.Extensions.AI.Abstractions": "10.5.2",
-          "Microsoft.Extensions.Logging.Abstractions": "10.0.7"
+          "Microsoft.Extensions.AI.Abstractions": "10.8.3",
+          "Microsoft.Extensions.Logging.Abstractions": "10.0.10"
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       },
       "Npgsql": {
@@ -446,7 +446,7 @@
         "dependencies": {
           "CredentialManagement": "[1.0.2, )",
           "Microsoft.Extensions.Logging.Abstractions": "[10.0.10, )",
-          "ModelContextProtocol": "[1.4.1, )"
+          "ModelContextProtocol": "[2.0.0, )"
         }
       },
       "performancemonitor.darling.analysis": {