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dotnet-sherlock-mcp MCP Server

.NET assembly introspection MCP server with advanced reflection and type analysis capabilities

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled dotnet-sherlock-mcp yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as Sherlock.MCP.Server on nuget. Runs locally.

Known issues

17 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

Most discussed

Too many file watches on Linux

I don't know why, but the sherlock-mcp on my ubuntu system has reached the (already increased) max inotify threshold. I tracked it down to the sherlock, which consumes massive amount of inotify.

Read the thread · 2026-04-28 · closed · external user · 1 comment

Signature rendering polish (umbrella)

Consumer report

Signature rendering nits.

  • Nullable<int> → int? (and IList<RecordedEvent> etc. are already fine — just this one)
  • overwrite = True / combineSubstreams = False — C# literal should be lowercase.
  • public abstract on interface members is redundant noise.
  • Snapshot\u00601 in FullName leaks backtick-arity encoding to the user; consider normalizing display to Snapshot<> or keeping Snapshot\1` but not letting the unicode-escaped form through JSON.

Read the thread · 2026-04-18 · closed · 1 comment

Add direct NuGet package -> assembly lookup tool

Consumer report

NuGet-aware lookup. I knew "Sharp.Events v41.0.1" but had to find ~/.nuget/packages/... manually. A find_assembly_by_nuget_package(packageId, version?, tfm?) that probes ~/.nuget/packages/<id>/<v>/lib/<tfm>/ would save a lot of grep. Or have assemblyPath accept sharp.events:41.0.1 shorthand.

Validation

ResolvePackageReferences already exists (src/server/Tools/ProjectAnalysisTools.cs:66-82) but it requires a project file path. There is no direct package-

Read the thread · 2026-04-18 · closed · 1 comment

Add reverse-lookup tools: implementations, returns, references

Priority: High — flagged by an AI consumer as the most-requested missing capability.

Consumer report

Cross-reference queries are missing. The three most valuable questions I had no tool for:

  • "What implements IEventStreamReader?"
  • "What methods return Snapshot<T>?"
  • "What references RecordedEvent?"

I ended up using strings over the DLL via Bash. find_implementations_of(typeName), find_references_to_type(typeName), find_methods_returning(typeName) would b

Read the thread · 2026-04-18 · closed · 1 comment

Add projection (summary|full) parameter to listing endpoints

Consumer report

Response size on listing endpoints. get_types_from_assembly for a mid-size assembly blew past the token limit (147KB for Sharp.Events — forced me to dump to a file and parse with Python). The per-type payload includes attributes + base type + interfaces + generic params + nested types, which is great for a detail view but overkill for a listing. Consider a projection: \"summary\"|\"full\" parameter — summary returns {FullName, Namespace, Kind} only. Similar for `get_t

Read the thread · 2026-04-18 · closed · 1 comment

Most recent

Upgrade ModelContextProtocol SDK from 0.3.0-preview.2

Why

src/server/Sherlock.MCP.Server.csproj pins ModelContextProtocol at 0.3.0-preview.2. Preview-to-newer upgrades in this SDK have had breaking changes around WithToolsFromAssembly, attribute namespaces, and DI parameter injection into static tools — the upgrade likely touches all 7 tool files mechanically.

Plan

  1. Land the end-to-end MCP integration tests first (separate issue) — they are the only realistic regression net for transport-level changes.
  2. Check the current stable

Read the thread · 2026-06-11 · closed · 0 comments

End-to-end MCP integration tests over stdio

Why

Integration coverage is currently a single Linux inotify test. Nothing exercises the actual MCP wire protocol: tool discovery, invocation, envelope shape, pagination round-trips. This is also the prerequisite regression net for the ModelContextProtocol SDK upgrade.

Proposal

Add a fixture in src/integration-tests that launches the built server as a child process over stdio and drives it with the ModelContextProtocol client package (McpClientFactory + StdioClientTransport):

1

Read the thread · 2026-06-11 · closed · 0 comments

Persistent on-disk assembly index for reverse lookup

Why

IndexStore and NoopAssemblyIndexService are placeholder stubs ("Minimal in-memory placeholder for future on-disk store"). Reverse lookups now scan in parallel with shared contexts (Phase A), but repeat queries against large solution-wide scopes still re-walk every type. An on-disk index makes repeat reverse lookups near-instant.

Build this only if Phase A parallelism proves insufficient on real workloads — measure first.

Sketch

  • Per-assembly index file under `~/.sherlock-m

Read the thread · 2026-06-11 · open · 0 comments

GetTypeHierarchy: populate DerivedTypes via optional searchScope instead of silent empty array

Problem

TypeAnalysisService.GetTypeHierarchy always returns an empty DerivedTypes array (documented internal stub). Consumers can't tell "no derived types" from "not computed" — the empty array is actively misleading to an LLM.

Proposal

Two-part fix:

  1. Add optional searchScope (additional assembly paths) parameter to the GetTypeHierarchy tool. When provided, populate derived types via ReverseLookupService.FindImplementations (already does exactly this scan).
  2. When absent (t

Read the thread · 2026-06-11 · closed · 0 comments

AnalyzeSolution returns zero projects for .slnx solutions

Problem

ProjectAnalysisService.AnalyzeSolutionFileAsync parses solutions with a regex that only understands the classic .sln format. The new XML .slnx format — which this very repository uses (src/Sherlock.MCP.slnx) — silently returns zero projects.

Fix

Branch on file extension in AnalyzeSolutionFileAsync:

  • .sln → existing regex path.
  • .slnx → XDocument parse of <Project Path="..."/> elements (including <Folder> nesting), filtered to the supported `.csproj/.vbproj/

Read the thread · 2026-06-11 · closed · 0 comments

Add GetAssemblyInfo tool: assembly-level attributes, TFM, and references

Why

There is no tool for assembly-level metadata: target framework, version attributes, InternalsVisibleTo, or referenced assemblies. These are cheap to extract and frequently needed for orientation before deeper analysis.

Proposal

New GetAssemblyInfo tool in ReflectionTools:

  • ctx.Assembly.GetCustomAttributesData() + existing AttributeUtils.Convert (already extracts constructor/named args structurally).
  • Assembly.GetReferencedAssemblies() for names/versions.
  • Summary pro

Read the thread · 2026-06-11 · closed · 0 comments

IL call analysis: GetMethodCalls tool and analysisDepth=il for FindReferencesTo

Why

FindReferencesTo is signature-surface only (base types, interfaces, method returns/params, field/property/event types). It cannot answer "who actually calls X?" or "what does this method call?" — method bodies are invisible. This is the single biggest capability unlock for LLM code-navigation workflows.

Proposal

  1. New src/runtime/IlAnalysisService.cs using System.Reflection.Metadata directly (already in the dependency closure via System.Reflection.MetadataLoadContext):

Read the thread · 2026-06-11 · closed · 0 comments

See all 17 reports Pod holds for dotnet-sherlock-mcp.

Firsthand observations

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