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.NET MCP Server MCP Server

AI assistant access to .NET SDK for projects, packages, building, testing, and development tools.

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

Status

Pod has not dialled .NET MCP Server 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.

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Published as Community.Mcp.DotNet on nuget. Runs locally.

Known issues

161 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

Implement tool-surface consolidation (Phase 1: add consolidated tools alongside existing)

Track implementation of the consolidated 10-tool surface described in doc/tool-surface-consolidation.md.

Scope (Phase 1 / non-breaking):

Read the thread · 2026-01-08 · closed · 2 comments

Release install/package validation (v1.0)

Goal

Ensure a smooth, repeatable install/run experience for v1.0 across supported environments.

Scope

Read the thread · 2026-01-02 · closed · 2 comments

feat: estimate and report workflow-level token savings (MCP vs non-MCP baseline)

Summary

Track and report estimated end-user token savings for complete workflows by comparing:

This should measure more than per-tool micro-optimizations and provide a clear overall savings number per workflow.

Problem

Current token-efficiency issues (#446-#451) improve specific responses and APIs, bu

Read the thread · 2026-05-30 · closed · 1 comment

feat: add minimal { success, summary } structuredContent to mutating tool actions

Summary

Mutating actions -- dotnet_project { New, Clean, Restore, Pack, Format, Publish }, dotnet_package { Add, Remove, Update }, dotnet_solution { Create, Add, Remove } -- currently return only raw CLI text. AI clients must parse this text to determine success/failure, which is fragile and token-expensive.

Proposed Change

Add a minimal MutationResult to structuredContent for all mutating actions:

{
  "success": true,
  "summary": "Package 'Newtonsoft.Json' (13.0.3) 

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/449) · 2026-05-30 · closed · 1 comment

### Use package@version for template packs (avoid deprecated :: separator)

#### Summary
MCP emitted a template package identifier using `::` (e.g., `Aspire.ProjectTemplates::13.1.0`) and `dotnet new` warned that `::` is deprecated in favor of `@`.

#### Expected
Emit `@` for package version selection:
- `Aspire.ProjectTemplates@13.1.0`

#### Acceptance criteria
- Commands use `@` when a version is specified.
- No behavior change when no version is provided.

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/296) · 2026-01-13 · closed · 1 comment

### Most recent

### Opportunity: OpenTelemetry trace-context propagation (SEP-414)

## Opportunity: OpenTelemetry trace-context propagation (SEP-414)

Part of #481.

SDK 2.0 propagates W3C Trace Context (`traceparent`/`tracestate`) across JSON-RPC messages built-in, using ActivitySource/Meter `"Experimental.ModelContextProtocol"`. This complements the existing telemetry stack (`DotNetMcp/Telemetry/*`).

### Tasks
- [ ] Verify incoming trace context is extracted and parented to server-side activities once on 2.0.
- [ ] Ensure the existing telemetry/metrics don't conflict

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/493) · 2026-06-30 · open · 0 comments

### Opportunity: first-class MCP Apps APIs (SEP-1865)

## Opportunity: first-class MCP Apps APIs (SEP-1865)

Part of #481.

The server already exposes `McpAppsResources` (`DotNetMcp/Resources/McpAppsResources.cs`). SDK 2.0 promotes MCP Apps to a structured extension with typed APIs: `McpApps.ExtensionId` (`io.modelcontextprotocol/ui`), `McpUiToolMeta`, and the `[McpAppUi]` attribute (diagnostic `MCPEXP003`, experimental).

### Tasks
- [ ] Evaluate moving `McpAppsResources` to the typed `ModelContextProtocol.Extensions.Apps` APIs.
- [ ] Use `

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/492) · 2026-06-30 · open · 0 comments

### Opportunity: JSON Schema 2020-12 output schemas (SEP-2106)

## Opportunity: JSON Schema 2020-12 output schemas (SEP-2106)

Part of #481.

SDK 2.0 allows any valid JSON Schema 2020-12 document for `Tool.OutputSchema` (not just `{"type":"object"}`), and fixes `$ref` resolution after output-schema wrapping. `Tool.InputSchema` is now required during deserialization.

### Tasks
- [ ] Review tools that return structured content; adopt richer, non-object output schemas where useful.
- [ ] Verify `$ref` usage resolves correctly post-wrapping.
- [ ] Conf

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/491) · 2026-06-30 · open · 0 comments

### Opportunity: TTL for list results (SEP-2549)

## Opportunity: TTL for list results (SEP-2549)

Part of #481.

SDK 2.0 adds optional `TimeToLive` (`TimeSpan?`) and `CacheScope` to `tools/list`, `prompts/list`, `resources/list`, and `server/discover` results via `ICacheableResult`. This pairs naturally with the existing caching infrastructure (`Caching/CachedResourceManager.cs`, `CacheMetrics.cs`) to reduce client round-trips.

### Tasks
- [ ] Evaluate emitting `TimeToLive`/`CacheScope` on list results, sourcing TTLs from the existing 

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/490) · 2026-06-30 · open · 0 comments

### Update documentation for SDK 2.0 / 2026-07-28 spec

## Update documentation for SDK 2.0 / 2026-07-28 spec

Part of #481.

### Tasks
- [ ] `doc/sdk-integration.md` — SDK 2.0 version, capability changes.
- [ ] `doc/machine-readable-contract.md` — `ServerFeatureSupport` changes (AsyncTasks, McpLogging, Sampling).
- [ ] `doc/capability-not-available.md` — error-code/capability updates from #SUB6.
- [ ] `doc/sdk-v1.1-compatibility.md` — note 2.0 migration and supersession.
- [ ] `README.md` — update any SDK version references and feature clai

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/489) · 2026-06-30 · open · 0 comments

### Fix tests for SDK 2.0

## Fix tests for SDK 2.0

Part of #481.

The test project (`DotNetMcp.Tests`) references `ModelContextProtocol` 1.4.0 and includes contract/conformance tests that may assert on changed surface.

### Tasks
- [ ] Bump the test project to SDK 2.0.x (tracked with #SUB2).
- [ ] Update/remove tests that reference removed experimental Tasks types (#SUB3).
- [ ] Ensure any `Tool` fixtures provide `InputSchema` (now required on deserialization — SEP-2106).
- [ ] Update error-code assertions aff

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/488) · 2026-06-30 · open · 0 comments

### Review error codes (-32002 deprecation, renumbered protocol codes)

## Review custom error codes (`-32002` deprecation, renumbered protocol codes)

Part of #481.

`DotNetMcp/Errors/McpErrorCodes.cs` defines custom codes, including `ResourceNotFound = -32002` and `CapabilityNotAvailable = -32001`.

SDK 2.0 / spec changes:
- **SEP-2164**: `-32002` resource-not-found is deprecated in favor of `-32602 InvalidParams` under `2026-07-28` (SDK auto-selects by negotiated version).
- Protocol error codes renumbered: `HeaderMismatch -32001 → -32020`, `MissingRequir

[Read the thread](https://github.com/jongalloway/dotnet-mcp/issues/487) · 2026-06-30 · open · 0 comments

[See all 23 reports Pod holds for .NET MCP Server](/mcp/net-mcp-server/issues) — of 161 qualified upstream.

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