refactor: dogfood PatternKit MCP registry

[JerrettDavis]

Summary

• replace the MCP registry provider aggregation loop with a PatternKit AsyncActionChain
• keep scope precedence and first-writer same-scope behavior intact
• add cancellation coverage for the provider chain
• document the PatternKit-backed MCP discovery path in the README

Closes #64

Validation

• dotnet restore JD.SemanticKernel.Extensions.slnx
• dotnet build JD.SemanticKernel.Extensions.slnx --configuration Release --no-restore
• dotnet test tests\JD.SemanticKernel.Extensions.Mcp.Tests\JD.SemanticKernel.Extensions.Mcp.Tests.csproj --configuration Release --no-build
• dotnet test JD.SemanticKernel.Extensions.slnx --configuration Release --no-build --verbosity minimal
• git diff --check

[github-actions]

⚠️ Deprecation Warning: The deny-licenses option is deprecated for possible removal in the next major release. For more information, see issue 997.

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 1 package(s) with unknown licenses.

See the Details below.

License Issues

src/JD.SemanticKernel.Extensions.Mcp/JD.SemanticKernel.Extensions.Mcp.csproj

Package	Version	License	Issue Type
PatternKit.Core	>= 0	Null	Unknown License

Denied Licenses:

GPL-2.0, GPL-3.0, AGPL-3.0

OpenSSF Scorecard

Package	Version	Score	Details
nuget/PatternKit.Core	>= 0	Unknown	Unknown

Scanned Files

• src/JD.SemanticKernel.Extensions.Mcp/JD.SemanticKernel.Extensions.Mcp.csproj

[github-actions]

Code Coverage

Summary
  Generated on: 06/02/2026 - 02:30:55
  Coverage date: 06/02/2026 - 02:30:47 - 06/02/2026 - 02:30:52
  Parser: MultiReport (8x Cobertura)
  Assemblies: 7
  Classes: 59
  Files: 56
  Line coverage: 74.5%
  Covered lines: 1338
  Uncovered lines: 457
  Coverable lines: 1795
  Total lines: 5070
  Branch coverage: 59.5% (492 of 826)
  Covered branches: 492
  Total branches: 826
  Method coverage: 85.2% (225 of 264)
  Full method coverage: 71.5% (189 of 264)
  Covered methods: 225
  Fully covered methods: 189
  Total methods: 264

JD.SemanticKernel.Extensions.Compaction                                          98.1%
  JD.SemanticKernel.Extensions.Compaction.CompactionFilter                        100%
  JD.SemanticKernel.Extensions.Compaction.CompactionOptions                       100%
  JD.SemanticKernel.Extensions.Compaction.ContextPercentageTrigger               87.5%
  JD.SemanticKernel.Extensions.Compaction.HierarchicalSummarizationStrategy      97.7%
  JD.SemanticKernel.Extensions.Compaction.ServiceCollectionExtensions             100%
  JD.SemanticKernel.Extensions.Compaction.TokenEstimator                          100%
  JD.SemanticKernel.Extensions.Compaction.TokenThresholdTrigger                   100%

JD.SemanticKernel.Extensions.Hooks                                               76.5%
  JD.SemanticKernel.Extensions.Hooks.CommandHookExecutor                            0%
  JD.SemanticKernel.Extensions.Hooks.ExtensionEvent                               100%
  JD.SemanticKernel.Extensions.Hooks.ExtensionEventBus                            100%
  JD.SemanticKernel.Extensions.Hooks.HookBuilder                                  100%
  JD.SemanticKernel.Extensions.Hooks.HookDefinition                               100%
  JD.SemanticKernel.Extensions.Hooks.HookParser                                  83.9%
  JD.SemanticKernel.Extensions.Hooks.KernelBuilderExtensions                     32.2%
  JD.SemanticKernel.Extensions.Hooks.SkHookFilter                                 100%
  JD.SemanticKernel.Extensions.Hooks.SkPromptHookFilter                           100%

JD.SemanticKernel.Extensions.Mcp                                                 60.4%
  JD.SemanticKernel.Extensions.Mcp.Discovery.ClaudeCodeMcpDiscoveryProvider       100%
  JD.SemanticKernel.Extensions.Mcp.Discovery.ClaudeDesktopMcpDiscoveryProvider    4.3%
  JD.SemanticKernel.Extensions.Mcp.Discovery.CodexMcpDiscoveryProvider           18.1%
  JD.SemanticKernel.Extensions.Mcp.Discovery.CopilotMcpDiscoveryProvider          4.7%
  JD.SemanticKernel.Extensions.Mcp.Discovery.FileMcpDiscoveryProvider            92.8%
  JD.SemanticKernel.Extensions.Mcp.Discovery.JdCanonicalMcpDiscoveryProvider     93.1%
  JD.SemanticKernel.Extensions.Mcp.Discovery.McpConfigParser                     73.9%
  JD.SemanticKernel.Extensions.Mcp.Discovery.VsCodeMcpDiscoveryProvider          86.6%
  JD.SemanticKernel.Extensions.Mcp.KernelBuilderMcpExtensions                       0%
  JD.SemanticKernel.Extensions.Mcp.KernelIntegration.McpKernelPluginFactory         0%
  JD.SemanticKernel.Extensions.Mcp.McpClientRegistry                                0%
  JD.SemanticKernel.Extensions.Mcp.McpInvocationResult                            100%
  JD.SemanticKernel.Extensions.Mcp.McpServerDefinition                            100%
  JD.SemanticKernel.Extensions.Mcp.McpToolDefinition                              100%
  JD.SemanticKernel.Extensions.Mcp.McpToolParameter                              93.3%
  JD.SemanticKernel.Extensions.Mcp.Registry.McpRegistry                           100%
  JD.SemanticKernel.Extensions.Mcp.Transport.HttpMcpClient                       87.6%
  JD.SemanticKernel.Extensions.Mcp.Transport.McpResponseParser                   90.3%
  JD.SemanticKernel.Extensions.Mcp.Transport.StdioMcpClient                      56.5%

JD.SemanticKernel.Extensions.Memory                                              94.5%
  JD.SemanticKernel.Extensions.Memory.InMemoryBackend                            96.1%
  JD.SemanticKernel.Extensions.Memory.MemoryRecord                                100%
  JD.SemanticKernel.Extensions.Memory.MemoryResult                                100%
  JD.SemanticKernel.Extensions.Memory.MemorySearchOptions                         100%
  JD.SemanticKernel.Extensions.Memory.MmrReranker                                96.9%
  JD.SemanticKernel.Extensions.Memory.QueryExpander                               100%
  JD.SemanticKernel.Extensions.Memory.SemanticMemory                             92.5%
  JD.SemanticKernel.Extensions.Memory.SemanticMemoryOptions                       100%
  JD.SemanticKernel.Extensions.Memory.ServiceCollectionExtensions                76.9%
  JD.SemanticKernel.Extensions.Memory.TemporalDecayScorer                         100%

JD.SemanticKernel.Extensions.Memory.Sqlite                                       94.9%
  JD.SemanticKernel.Extensions.Memory.Sqlite.ServiceCollectionExtensions          100%
  JD.SemanticKernel.Extensions.Memory.Sqlite.SqliteMemoryBackend                 94.7%

JD.SemanticKernel.Extensions.Plugins                                             74.5%
  JD.SemanticKernel.Extensions.Plugins.KernelBuilderExtensions                      0%
  JD.SemanticKernel.Extensions.Plugins.LoadedPlugin                               100%
  JD.SemanticKernel.Extensions.Plugins.PluginDependencyResolver                   100%
  JD.SemanticKernel.Extensions.Plugins.PluginLoader                              96.8%
  JD.SemanticKernel.Extensions.Plugins.PluginLoadOptions                            0%
  JD.SemanticKernel.Extensions.Plugins.PluginManifest                             100%

JD.SemanticKernel.Extensions.Skills                                              84.1%
  JD.SemanticKernel.Extensions.Skills.KernelBuilderExtensions                       0%
  JD.SemanticKernel.Extensions.Skills.SkillDefinition                             100%
  JD.SemanticKernel.Extensions.Skills.SkillKernelFunction                         100%
  JD.SemanticKernel.Extensions.Skills.SkillLoader                                 100%
  JD.SemanticKernel.Extensions.Skills.SkillLoadOptions                              0%
  JD.SemanticKernel.Extensions.Skills.SkillParser                                97.2%

[github-actions]

Test Results

243 tests   217 ✅  6s ⏱️
  8 suites   26 💤
  8 files      0 ❌

Results for commit 2db8c99.