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roslyn-mcp MCP Server

Local-first MCP server for semantic C# analysis & refactoring via Roslyn & MSBuildWorkspace.

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

Status

Pod has not dialled roslyn-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 Darylmcd.RoslynMcp on nuget. Runs locally.

Known issues

67 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

[audit] symbol_search lacks pagination — broad queries overflow MCP response cap on large solutions

Finding

symbol_search has no pagination parameters (offset, limit, or cursor). Broad queries on large solutions produce 69K+ responses that exceed the MCP transport cap, making the tool unusable without kind-filter narrowing. Other tools in the same family (list_analyzers, test_discover) have pagination.

Repro

Call symbol_search with a broad query string (no kind filter) on a 36-project solution. Observe response body exceeds 69K characters.

Proposed fix

Add `offset

Read the thread · 2026-05-11 · closed · 3 comments

[audit] guided_extract_interface prompt payload exceeds MCP cap (~30+ KB)

  • id: itchatbot-guided-extract-interface-prompt-payload-cap
  • source-repo: itchatbot
  • severity: P1
  • area: prompts
  • server-version: 1.38.1
  • anchors:
    • src/RoslynMcp.Host.Stdio/Prompts/PromptMessageBuilder.cs

finding: get_prompt_text for guided_extract_interface overflows the MCP inline payload cap (~30+ KB observed) on workspaces with 9+ projects. This is the third prompt of three in the same payload-cap-overflow family — sister issues are [#755](https://github.com/darylmcd/Roslyn-

Read the thread · 2026-05-16 · closed · 1 comment

[audit] find_unused_symbols flags *ForTest test-bridge accessors as unused (convention-invoked exclusion gap)

  • id: tradewise-find-unused-symbols-test-bridge-suffix-exclusion-gap
  • source-repo: tradewise
  • severity: P3
  • area: tools
  • server-version: 1.38.1
  • anchors:
    • src/RoslynMcp.Roslyn/Services/DeadCodeService.cs

finding: find_unused_symbols(includePublic=false) flags Build*CommandTextForTest methods (test-bridge accessors used via InternalsVisibleTo/reflection from test assemblies) as unused with confidence=high. 20 such hits observed in the TradeWise consumer audit. The existing "c

Read the thread · 2026-05-16 · closed · 1 comment

[audit] get_prompt_text has side-effects — debug_test_failure runs dotnet test, security_review runs vuln scan

  • id: itchatbot-get-prompt-text-side-effects-in-rendering
  • source-repo: itchatbot
  • severity: P2
  • area: prompts
  • server-version: 1.38.1
  • anchors:
    • src/RoslynMcp.Host.Stdio/Tools/PromptShimTools.cs
    • src/RoslynMcp.Host.Stdio/Prompts/PromptMessageBuilder.cs

finding: get_prompt_text for at least two prompts actually invokes live tools during rendering rather than performing pure template substitution: debug_test_failure runs dotnet test (16.5s, 1126 test outcomes captured); `sec

Read the thread · 2026-05-16 · closed · 1 comment

[audit] get_di_registrations default response (showLifetimeOverrides=true) overflows MCP cap on 100+ registrations

  • id: itchatbot-get-di-registrations-default-response-exceeds-mcp-cap
  • source-repo: itchatbot
  • severity: P2
  • area: tools
  • server-version: 1.38.1
  • anchors:
    • src/RoslynMcp.Host.Stdio/Tools/AdvancedAnalysisTools.cs

finding: get_di_registrations with its default response shape (showLifetimeOverrides=true) produces an 86 KB body on a 141-registration DI graph, exceeding the MCP inline transport cap and triggering a write-to-disk envelope fallback that breaks default callers. Peer too

Read the thread · 2026-05-16 · closed · 1 comment

Most recent

Option C (Claude Code plugin) doesn't bundle the server binary, contradicting docs, and can't use Option B's dnx invocation

Description

README and docs/compatibility.md describe Option C (the Claude Code plugin) as if it's self-contained:

  • README: "The plugin bundles the MCP server, 32 skills, and safety hooks."
  • docs/compatibility.md install-path table: Option C cold-start cost is "Lowest (bundled)" and update story is "/plugin update".
  • docs/compatibility.md client table: "The Claude Code Plugin path ... is the highest-fidelity install — bundles the server, 32 skills, and safety hooks."

In

Read the thread · 2026-08-21 · closed · outside contributor · 0 comments

Infer workspaceId from filePath when the call already identifies exactly one loaded workspace

Signal

From the same 10,383-event MCP log survey (2026-04 → 2026-07): 23 of 69 structured tool errors — the single largest category — are workspace-disambiguation failures.

InvalidArgument | find_references | Parameter 'workspaceId' is invalid:
  workspaceId was omitted but 2 workspaces are loaded
  (8f6915d11da64f378bd17149cc69b751, 9c49cfa626844a6eaf0bcdec43af740d).
  Pass workspaceId explicitly to choose one.

Spread across find_references, compile_check, `document_symbol

Read the thread · 2026-07-31 · closed · 0 comments

Accept LSP-style 'character' as an alias for the 'column' source-location parameter

Signal

A survey of 10,383 MCP log events across 43 working directories (2026-04 → 2026-07) turned up 69 structured tool errors. The single largest shape — 13 occurrences, still recurring as of 2026-07-28 across two unrelated repos (TradeWise, SnipCue) — is:

InvalidArgument | find_references | Parameter '<unknown>' is invalid:
  Source location is incomplete. Provide all of filePath, line, and column. Missing: column.
  Note: this server uses parameter name 'column' (1-based), not th

[Read the thread](https://github.com/darylmcd/Roslyn-Backed-MCP/issues/1128) · 2026-07-31 · closed · 0 comments

### [audit] test_reference_map.limit caps coveredSymbols only; mockDriftWarnings + uncoveredSymbols unpaginated

- id: itchatbot-test-reference-map-pagination-only-covers-covered-symbols
- source-repo: itchatbot
- severity: P3
- area: tools
- server-version: 1.38.1
- anchors:
  - src/RoslynMcp.Host.Stdio/Tools/TestCoverageTools.cs

**finding**: `test_reference_map`'s `limit` parameter only caps the `coveredSymbols` collection. The other two enumerable response fields — `mockDriftWarnings` (109 entries observed) and `uncoveredSymbols` — are unpaginated, producing a 60 KB payload even when caller sets `limit

[Read the thread](https://github.com/darylmcd/Roslyn-Backed-MCP/issues/774) · 2026-05-16 · closed · 0 comments

### [audit] project_graph.outputType reports Library for ASP.NET Web/Worker SDK projects (should be Exe)

- id: tradewise-project-graph-output-type-misreports-sdk-defaulted-exe
- source-repo: tradewise
- severity: P3
- area: tools
- server-version: 1.38.1
- anchors:
  - src/RoslynMcp.Host.Stdio/Tools/WorkspaceTools.cs
  - src/RoslynMcp.Roslyn/Services/WorkspaceManager.cs

**finding**: `project_graph.outputType` returns `Library` for ASP.NET Core Web (`Microsoft.NET.Sdk.Web`) and Worker (`Microsoft.NET.Sdk.Worker`) projects that have no explicit `<OutputType>` element. These SDKs default `OutputType=

[Read the thread](https://github.com/darylmcd/Roslyn-Backed-MCP/issues/773) · 2026-05-16 · closed · 0 comments

### [audit] P2 polish list (firewallanalyzer 2026-05-16): tools/prompts/resources medium-severity findings

Bundled list of P2-class findings from the 2026-05-16 mcp-server-surface-test run against darylmcd/DotNet-Firewall-Analyzer. Server v1.38.1+7b2c0b9, catalog 2026.04. Audit report: `audit-reports/20260516T062913Z_firewallanalyzer_mcp-server-surface-test.md`. Each item below is a distinct finding and may be split into its own issue if a maintainer picks it up. Items prefixed with the section number from the audit report.

---

**13.3 Cross-tool blind spot on static extension-host classes** — `find

[Read the thread](https://github.com/darylmcd/Roslyn-Backed-MCP/issues/768) · 2026-05-16 · closed · 0 comments

### [audit] Preview tokens expire silently across workspace auto-reload; staleness contract undocumented

**id:** firewallanalyzer-preview-token-stale-across-auto-reload
**source-repo:** darylmcd/DotNet-Firewall-Analyzer (firewallanalyzer)
**severity:** P1
**area:** tools
**server-version:** 1.38.1+7b2c0b9
**audit-report:** audit-reports/20260516T062913Z_firewallanalyzer_mcp-server-surface-test.md

**Finding:** A preview token issued by `*_preview` (e.g. `scaffold_test_preview`) becomes stale after an intervening apply that triggers workspace auto-reload (visible as `_meta.staleAction=auto-reloaded`

[Read the thread](https://github.com/darylmcd/Roslyn-Backed-MCP/issues/767) · 2026-05-16 · closed · 0 comments

[See all 18 reports Pod holds for roslyn-mcp](/mcp/roslyn-mcp/issues) — of 67 qualified upstream.

## Firsthand observations

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