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RoselineMCP MCP Server

MCP server for C# code analysis and automated fixing using Roslyn analyzers and code fix providers.

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

Status

Pod has not dialled RoselineMCP 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 RoselineMCP on nuget. Runs locally.

Known issues

37 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

[Bug]: The failure envelope names no checkout, so an omitted project miss stays undiagnosable

Scope sharpened 2026-08-20 by a backlog triage pass. Two thirds of this issue have landed; the old title and implementation plan described work that is already merged, so a worker picking it up cold would have re-implemented #143. What remains is one specific gap, named below. The original report is preserved at the bottom.

What is left

The failure path names no checkout. #143 added resolvedPath to every response from a tool with an optional project — but only on the **s

Read the thread · 2026-08-19 · closed · 4 comments

[Bug]: The write confirmation asks a human before establishing there is a non-empty write to approve

Rescoped 2026-08-20 by a backlog triage pass. This issue was filed against one instance (newSource validated after the prompt). That instance is fixed — verified against dev @ eb19739, not inferred from a PR title. The root it was an instance of is still open, and one further instance of it remains. The issue now tracks the root; the original report is preserved verbatim at the bottom.

What happened?

**The root: the write-confirmation gate asks a human before estab

Read the thread · 2026-08-20 · closed · 3 comments

[Bug]: The write confirmation is composed per tool by raw interpolation, so caller input can forge the sentence a human approves

What happened?

Found by the code-review pass on PR #157 (issue #154). Pre-existing — not introduced by that PR, though #157's longer sentence makes the first half of it easier to exploit.

ToolExecutionHelper.ResolveWriteModeAsync (#129) centralised the write-confirmation gate's policy — when to elicit, how to read the answer, what a timeout means — but deliberately left the wording to each tool. Each of the three write tools therefore builds its sentence itself, by interpolati

Read the thread · 2026-08-20 · closed · 2 comments

[Bug]: resolvedPath can name a .sln that does not contain the project that answered

What happened?

resolvedPath — the field added in #143 so a caller can tell which checkout and which project file actually answered — can name a .sln that does not contain the project the symbols came from.

ProjectLoader.LoadAsync resolves a .csproj target by first looking for the nearest ancestor .sln and opening it, then locating the target inside it:

var solutionPath = FindSolutionFile(targetPath);
if (solutionPath != null)
{
    var solution = await workspace.Ope

[Read the thread](https://github.com/Atypical-Consulting/RoselineMCP/issues/151) · 2026-08-20 · closed · 2 comments

### [Feature]: Extract the duplicated write-confirmation block shared by the three write tools

Continues #125.

## What problem does this solve?

The write-confirmation block is copy-pasted verbatim across all three write tools. `ApplyFixesTool.cs`,
`EditMemberTool.cs` and `RenameSymbolTool.cs` each carry the same ~12 lines:

```csharp
var effectivePreviewOnly = previewOnly;
string? declineNote = null;
// Use the caller's request token (not the wall-clock timeout) for the human confirmation
// round-trip: think-time must not be charged against the analysis budget.
if (!previewOnly && !awa

[Read the thread](https://github.com/Atypical-Consulting/RoselineMCP/issues/129) · 2026-08-19 · closed · 2 comments

### Most recent

### [Bug]: ProjectLoader's explicit-.csproj ambiguity fallback catches ArgumentException too broadly

**Related:** #213, #218

## What happened?

`ProjectLoader.FindSolutionFile`'s ambiguous-solution-walk fallback (added by #213 / PR #218) is
gated with:

```csharp
catch (ArgumentException) when (IsExplicitCsprojPath(project))
{
    // degrade to a standalone load of the named .csproj
}

This catches the exception type, not a signal specific to "the ancestor walk found more than one .sln". Anything else in FindSolutionFile's call chain that happens to throw ArgumentException (e.g.

Read the thread · 2026-08-26 · closed · 0 comments

[Bug]: FindSolutionFile's ambiguity refusal (#172) breaks an explicitly-named .csproj in a multi-solution monorepo

What happened?

ProjectLoader.FindSolutionFile (the ancestor .sln walk LoadAsync uses once a .csproj target is resolved) gained an ambiguity check in #172/PR #192: when an ancestor directory holds more than one candidate .sln, it now throws ArgumentException instead of silently taking slnFiles[0]. That's correct for the AppleDouble-shadow scenario #172 fixed, but the check runs unconditionally — for every non-.sln target LoadAsync resolves, including one the caller named

Read the thread · 2026-08-26 · closed · 0 comments

[Feature]: Pin website/src/data/tools.ts to the reflected [McpServerTool] set — #197's root cause survives

What problem does this solve?

Continues #197.

#206 made the website's tool count self-consistent. It did not make it correct, and the distinction is the whole of this issue.

The headings now derive from website/src/data/tools.ts, so the page can no longer contradict its own grid. But tools.ts is itself a hand-maintained array, and nothing links it to the server's actual [McpServerTool] set. The chain has two links and #206 closed only the second:

C# [McpServerTool]

[Read the thread](https://github.com/Atypical-Consulting/RoselineMCP/issues/208) · 2026-08-25 · closed · 0 comments

### [Feature]: ElicitationTests' prompt-assertion helpers encode stale assumptions about the prompt frame

## What problem does this solve?

Deferred by PR #202 (which closed #173) — two defects in `RoselineMCP.Tests/Protocol/ElicitationTests.cs`
that share one root: the **prompt-assertion helpers reason about the sentence heuristically** — by
counting apostrophes and hunting for quote characters — rather than from the `WriteScope` vocabulary
the sentences are actually rendered from. Because the helpers encode assumptions about the *frame*,
they drift whenever the frame changes, and #173 changed it.

[Read the thread](https://github.com/Atypical-Consulting/RoselineMCP/issues/204) · 2026-08-25 · closed · 0 comments

### [Bug]: The apply_fixes confirmation for a .csproj target reads like a promise to rewrite that file

## What happened?

Deferred deliberately by PR #202 (which closed #173) — filed so the decision is tracked rather than
left in a source comment.

#173 re-ordered two of the three write-confirmation sentences so the resolved target is the **last**
thing in every prompt. That closed a real hole, but it changed the frame the `apply_fixes` sentence
sits in, and the `.csproj` branch inherited a new ambiguity from the move.

`WritePrompt.RenderPrimaryProjectOf` (`RoselineMCP/Models/WriteScope.cs`) bra

[Read the thread](https://github.com/Atypical-Consulting/RoselineMCP/issues/203) · 2026-08-25 · closed · 0 comments

### [Bug]: verification/check_compilation error paths still anchor to Solution.FilePath — the fourth site diverging from resolvedPath

## What happened?

`Continues #181.`

#151 changed how `resolvedPath` is computed. #181 then updated the three consumers that had been
re-deriving the same anchor independently (`CodeNavigationService.BaseDirOf`, `CodeFixService`'s
`ApplyFixes`, `CodeEditService.RelativePath`) to read one authoritative value,
`LoadedProject.BaseDirectory`. Its scope named exactly those three.

**A fourth site was left behind, deliberately and with the reason recorded** — but it is still a
live divergence in ship

[Read the thread](https://github.com/Atypical-Consulting/RoselineMCP/issues/199) · 2026-08-25 · closed · 0 comments

### [Feature]: analyzerLoad — count references without analyzers instead of naming each, and name code fixers that fail to load

Continues #183.

**Related:** #180, #183, #188

## What problem does this solve?

#188 shipped the `analyzerLoad` block on `list_diagnostics`, `analyze_solution` and `apply_fixes`:
every analyzer reference that contributed nothing is named, with Roslyn's reason. Two edges were
left for the owner to decide, both measured while landing it:

**(a) Volume.** On a project that references the Roslynator packages — this repository, and any
target that does — **33 of 44** analyzer references yield no C#

[Read the thread](https://github.com/Atypical-Consulting/RoselineMCP/issues/191) · 2026-08-24 · open · 0 comments

[See all 23 reports Pod holds for RoselineMCP](/mcp/roselinemcp/issues) — of 37 qualified upstream.

## Firsthand observations

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