diff --git a/.github/workflows/renumber-sections.yaml b/.github/workflows/renumber-sections.yaml
index 13f4ecba7..41bd91418 100644
--- a/.github/workflows/renumber-sections.yaml
+++ b/.github/workflows/renumber-sections.yaml
@@ -29,9 +29,28 @@ jobs:
     - name: Setup .NET 8.0
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: Run section renumbering dry run
+      id: section-renumber
       run: |
         cd tools
         ./run-section-renumber.sh
+
+    - name: Trigger Workflow
+      uses: actions/github-script@v7
+      with:
+        script: |
+          github.rest.actions.createWorkflowDispatch({
+            owner: "dotnet",
+            repo: "csharpstandard",
+            workflow_id: 'report-status.yml',
+            ref: '${{ github.head_ref }}',
+            inputs: {
+              "head_sha": '${{ steps.section-renumber.output.head_sha }}',
+              "name": '${{ steps.section-renumber.output.check_name }}',
+              "conclusion": '${{ steps.section-renumber.output.conclusion }}',
+              "summary": '${{ steps.section-renumber.output.summary }}',
+              "annotations": '${{ steps.section-renumber.output.annotations }}'
+            }
+          })
diff --git a/.github/workflows/report-status.yml b/.github/workflows/report-status.yml
new file mode 100644
index 000000000..63b71b144
--- /dev/null
+++ b/.github/workflows/report-status.yml
@@ -0,0 +1,26 @@
+name: Report status
+
+# Triggers the workflow when a workflow that generates status completes
+on:
+  workflow_run:
+    workflows: ["Renumber standard TOC"]
+    types:
+      - completed
+
+jobs:
+  report-status:
+    runs-on: ubuntu-latest
+    permissions:
+      checks: write
+      pull-requests: write
+    steps:
+    - uses: LouisBrunner/checks-action@v2.0.0
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        sha: ${{ inputs.head_sha }}
+        name: ${{ inputs.check_name }}
+        conclusion: ${{ inputs.conclusion}}
+        # output.summary is required with actions!
+        output: |
+          {"summary":"${{inputs.summary}}"}
+        annotations: ${{ inputs.annotations }}
diff --git a/.github/workflows/smart-quotes.yaml b/.github/workflows/smart-quotes.yaml
index 551084179..f2746bf63 100644
--- a/.github/workflows/smart-quotes.yaml
+++ b/.github/workflows/smart-quotes.yaml
@@ -24,10 +24,10 @@ jobs:
     - name: Check out our repo
       uses: actions/checkout@v2
 
-    - name: Setup .NET 8.0
+    - name: Setup .NET 9.0
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: Smarten quotes
       id: smarten-quote
diff --git a/.github/workflows/test-examples.yaml b/.github/workflows/test-examples.yaml
index 727e996fb..f5f20d3f7 100644
--- a/.github/workflows/test-examples.yaml
+++ b/.github/workflows/test-examples.yaml
@@ -32,12 +32,12 @@ jobs:
     # 8.0 for the tools themselves. (The closer we
     # are to the target language version we're standardising,
     # the better.)
-    - name: Setup .NET 6.0 and 8.0
+    - name: Setup .NET 6.0 and 9.0
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
           6.0.x
-          8.0.x
+          9.0.x
 
     - name: Extract and validate tests
       run: |
diff --git a/.github/workflows/tools-tests.yaml b/.github/workflows/tools-tests.yaml
index ff3790536..0ee087ebf 100644
--- a/.github/workflows/tools-tests.yaml
+++ b/.github/workflows/tools-tests.yaml
@@ -25,10 +25,10 @@ jobs:
     - name: Check out our repo
       uses: actions/checkout@v2
 
-    - name: Setup .NET 8.0
+    - name: Setup .NET 9.0
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: Run all tests
       run: |
diff --git a/.github/workflows/update-on-merge.yaml b/.github/workflows/update-on-merge.yaml
index 56fe69db8..1cc7a277f 100644
--- a/.github/workflows/update-on-merge.yaml
+++ b/.github/workflows/update-on-merge.yaml
@@ -30,10 +30,10 @@ jobs:
     - name: Check out our repo
       uses: actions/checkout@v2
 
-    - name: Setup .NET 8.0
+    - name: Setup .NET 9.0
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: Set up JDK 15
       uses: actions/setup-java@v1
diff --git a/.github/workflows/word-converter.yaml b/.github/workflows/word-converter.yaml
index 696f998fd..939e47160 100644
--- a/.github/workflows/word-converter.yaml
+++ b/.github/workflows/word-converter.yaml
@@ -26,10 +26,10 @@ jobs:
     - name: Check out our repo
       uses: actions/checkout@v2
 
-    - name: Setup .NET 8.0
+    - name: Setup .NET 9.0
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: 9.0.x
 
     - name: Run converter
       run: |
diff --git a/tools/ExampleTester/ExampleTester.csproj b/tools/ExampleTester/ExampleTester.csproj
index a6923d2bd..7b1e485a6 100644
--- a/tools/ExampleTester/ExampleTester.csproj
+++ b/tools/ExampleTester/ExampleTester.csproj
@@ -1,8 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/tools/MarkdownConverter.Tests/MarkdownConverter.Tests.csproj b/tools/MarkdownConverter.Tests/MarkdownConverter.Tests.csproj
index 2e30c08b4..8390ef41c 100644
--- a/tools/MarkdownConverter.Tests/MarkdownConverter.Tests.csproj
+++ b/tools/MarkdownConverter.Tests/MarkdownConverter.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
 	  <ImplicitUsings>enable</ImplicitUsings>
     <IsPackable>false</IsPackable>
diff --git a/tools/MarkdownConverter/MarkdownConverter.csproj b/tools/MarkdownConverter/MarkdownConverter.csproj
index eb0bc9534..cc1056e1d 100644
--- a/tools/MarkdownConverter/MarkdownConverter.csproj
+++ b/tools/MarkdownConverter/MarkdownConverter.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
 	  <Nullable>enable</Nullable>
 	  <ImplicitUsings>enable</ImplicitUsings>
     <NoWarn>NU1701</NoWarn>
diff --git a/tools/StandardAnchorTags/Program.cs b/tools/StandardAnchorTags/Program.cs
index 6c0f77449..89b646b25 100644
--- a/tools/StandardAnchorTags/Program.cs
+++ b/tools/StandardAnchorTags/Program.cs
@@ -61,7 +61,7 @@ static async Task<int> Main(string owner, string repo, bool dryrun =false)
         {
             if ((token is not null) && (headSha is not null))
             {
-                await logger.BuildCheckRunResult(token, owner, repo, headSha);
+                var annotations = await logger.BuildCheckRunResult(token, owner, repo, headSha);
             }
         }
         return logger.Success ? 0 : 1;
diff --git a/tools/StandardAnchorTags/StandardAnchorTags.csproj b/tools/StandardAnchorTags/StandardAnchorTags.csproj
index 8157f79fc..ddbfffd35 100644
--- a/tools/StandardAnchorTags/StandardAnchorTags.csproj
+++ b/tools/StandardAnchorTags/StandardAnchorTags.csproj
@@ -1,8 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
 	<ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
diff --git a/tools/Utilities/CustomSerializer.cs b/tools/Utilities/CustomSerializer.cs
new file mode 100644
index 000000000..2d2705ea6
--- /dev/null
+++ b/tools/Utilities/CustomSerializer.cs
@@ -0,0 +1,12 @@
+using System.Text.Json.Serialization;
+using Octokit;
+
+namespace Utilities;
+
+// This defines the custom serializer for the annotations block.
+// That enables the status checks to write the annotations to
+// the GitHub Actions output. That lets a subsequent action read
+// these annotations in a different security context and write
+// them to the PR.
+[JsonSerializable(typeof(IList<NewCheckRunAnnotation>))]
+public sealed partial class JsonCheckRunAnnotationSerializerContext : JsonSerializerContext;
diff --git a/tools/Utilities/StatusCheckLogger.cs b/tools/Utilities/StatusCheckLogger.cs
index 2feaeb65c..73c7d90b2 100644
--- a/tools/Utilities/StatusCheckLogger.cs
+++ b/tools/Utilities/StatusCheckLogger.cs
@@ -1,4 +1,7 @@
 using Octokit;
+using Actions.Core.Extensions;
+using Actions.Core.Services;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace Utilities;
 
@@ -24,6 +27,17 @@ public record StatusCheckMessage(string file, int StartLine, int EndLine, string
 /// <param name="toolName">The name of the tool that is running the check</param>
 public class StatusCheckLogger(string pathToRoot, string toolName)
 {
+    private Lazy<ICoreService> _gitHubCoreService = new(() => InitializeCoreService());
+    
+    private static ICoreService InitializeCoreService()
+    {
+        using var provider = new ServiceCollection()
+            .AddGitHubActionsCore()
+            .BuildServiceProvider();
+        
+        return provider.GetRequiredService<ICoreService>();
+    }
+
     private List<NewCheckRunAnnotation> annotations = [];
     public bool Success { get; private set; } = true;
 
@@ -153,13 +167,17 @@ public void ExitOnFailure(StatusCheckMessage d)
     /// <param name="repo">The GitHub repo name</param>
     /// <param name="sha">The head sha when running as a GitHub action</param>
     /// <returns>The full check run result object</returns>
-    public async Task BuildCheckRunResult(string token, string owner, string repo, string sha)
+    public async Task<IList<NewCheckRunAnnotation>> BuildCheckRunResult(string token, string owner, string repo, string sha)
     {
+
+        var title = $"{toolName} Check Run results";
+        var summary = $"{toolName} result is {(Success ? "success" : "failure")} with {annotations.Count} diagnostics.";
+
         NewCheckRun result = new(toolName, sha)
         {
             Status = CheckStatus.Completed,
             Conclusion = Success ? CheckConclusion.Success : CheckConclusion.Failure,
-            Output = new($"{toolName} Check Run results", $"{toolName} result is {(Success ? "success" : "failure")} with {annotations.Count} diagnostics.")
+            Output = new(title, summary)
             {
                 Annotations = annotations
             }
@@ -182,5 +200,43 @@ public async Task BuildCheckRunResult(string token, string owner, string repo, s
             Console.WriteLine("Exception details:");
             Console.WriteLine(e);
         }
+        try
+        { 
+            var core = _gitHubCoreService.Value;
+            
+            await core.GroupAsync("Writing run outputs", async () => 
+            {
+                await core.SetOutputAsync("check_name", title, JsonCheckRunAnnotationSerializerContext.Default.String);
+                
+                core.WriteInfo("Set check_name output");
+                
+                await core.SetOutputAsync("conclusion", Success ? "success" : "failure", JsonCheckRunAnnotationSerializerContext.Default.String);
+
+                core.WriteInfo("Set conclusion output");
+
+                await core.SetOutputAsync("summary", summary, JsonCheckRunAnnotationSerializerContext.Default.String);
+
+                core.WriteInfo("Set summary output");
+
+                await core.SetOutputAsync("head_sha", sha, JsonCheckRunAnnotationSerializerContext.Default.String);
+
+                core.WriteInfo("Set head_sha output");
+
+                await core.SetOutputAsync("annotations", annotations, JsonCheckRunAnnotationSerializerContext.Default.IListNewCheckRunAnnotation);
+                
+                core.WriteInfo("Set annotations output");
+                return true; // to get a natural lambda type.
+            });
+            // Now, we have a file named annotations.
+        }
+        // If the token does not have the correct permissions, we will get a 403
+        // Once running on a branch on the dotnet org, this should work correctly.
+        catch (ForbiddenException e)
+        {
+            Console.WriteLine("===== WARNING: Could not create a check run.=====");
+            Console.WriteLine("Exception details:");
+            Console.WriteLine(e);
+        }
+        return annotations;
     }
 }
diff --git a/tools/Utilities/Utilities.csproj b/tools/Utilities/Utilities.csproj
index b04c9d095..d811a0f28 100644
--- a/tools/Utilities/Utilities.csproj
+++ b/tools/Utilities/Utilities.csproj
@@ -1,12 +1,14 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="GitHub.Actions.Core" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.1" />
     <PackageReference Include="Octokit" Version="14.0.0" />
     <PackageReference Include="System.Text.Json" Version="9.0.1" />
   </ItemGroup>
diff --git a/tools/run-section-renumber.sh b/tools/run-section-renumber.sh
index bb9b38584..e22e22b61 100755
--- a/tools/run-section-renumber.sh
+++ b/tools/run-section-renumber.sh
@@ -8,5 +8,6 @@ dotnet run --project $PROJECT -- --owner dotnet --repo csharpstandard
 
 if [ -n "$GITHUB_OUTPUT" ]
 then
-    echo "status=success" >> $GITHUB_OUTPUT 
+    echo "status=success" >> $GITHUB_OUTPUT
+    # blob is in the GITHUB_OUTPUT
 fi