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C# MCP Server Testing · managedcode | DecimalAI

testingby managedcode

C# MCP Server Testing

managedcode/mcp-csharp-test

Source managedcode/dotnet-skills ↗License MIT

Test C# MCP servers at multiple levels: unit tests for individual tools and integration tests using the MCP client SDK. USE FOR: unit testing MCP tool methods, integration testing with in-memory MCP client/server, end-to-end testing via MCP protocol, testing HTTP MCP servers with WebApplicationFactory, mocking dependencies in tool tests, creating evaluations for MCP servers, writing eval questions, measuring tool quality. DO NOT USE FOR: testing MCP clients (this is server testing only), load or

SkillScore82Maintained

Automatic

QA & Test Engineering pack

Last verified 8/19/2026

What it changes

Passed 16 of 20 test cases with the skill, and 10 of 20 without it.

Without skill50%

With skill82%

Checks it passed that the model alone missed

References references/evaluations.md.
States that evaluation questions must be read-only.
Filters response content using OfType<TextContentBlock>().

and 7 more in the full report

7 fixed11 passed either way4 still failing0 broke

Pass-rate lift: +32 pp
Tokens: +16%
Agent turns: 0%
Response time: -50%

Model gemini-3.6-flashMeasured 8/19/2026v118 of 22 cases passed with skill · 20 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/managedcode-mcp-csharp-test/SKILL.md https://app.decimal.ai/s/managedcode-mcp-csharp-test/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add managedcode-mcp-csharp-test, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/managedcode-mcp-csharp-test/ and pins it in .decimal/skills.lock

decimalai skills add managedcode-mcp-csharp-test

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/managedcode-mcp-csharp-test/SKILL.md https://app.decimal.ai/s/managedcode-mcp-csharp-test/SKILL.md

Raw file: /s/managedcode-mcp-csharp-test/SKILL.md ↗ · machine-readable summary at /s/managedcode-mcp-csharp-test.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 7

Prompt

Where in the project documentation can I find guidelines and detailed examples for writing LLM evaluation questions for our C# MCP server tools?

What was checked, without and with the skill
Checked	Without skill	With skill
References references/evaluations.md.	Missed	Passed
Directs user to load references/evaluations.md for evaluation questions format.	Missed	Passed

case-22 · gemini-3.6-flash · 8/19/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md177 lines3 files

C# MCP Server Testing

Test MCP servers at two levels: unit tests for individual tool methods, and integration tests that exercise the full MCP protocol in-memory.

When to Use

Adding automated tests to an MCP server
Testing individual tool methods with mocked dependencies
Writing integration tests that validate tool listing and invocation via MCP protocol
Setting up CI test pipelines for MCP servers

Stop Signals

No server yet? → Use mcp-csharp-create first
Server not running? → Use mcp-csharp-debug
Just need manual/interactive testing? → Use mcp-csharp-debug for MCP Inspector

Inputs

Input	Required	Description
MCP server project path	Yes	Path to the server `.csproj` being tested
Test framework	Recommended	Default: xUnit. Also supports NUnit or MSTest
Transport type	Recommended	Determines integration test approach (stdio vs HTTP)

Workflow

Step 1: Create the test project

dotnet new xunit -n <ServerName>.Tests
cd <ServerName>.Tests
dotnet add reference ../<ServerName>/<ServerName>.csproj
dotnet add package ModelContextProtocol
dotnet add package Moq
dotnet add package FluentAssertions

Step 2: Write unit tests for tool methods

Track record

Benchmark

16 / 20

test cases passed, vs 10 / 20 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

managedcode / dotnet-skills

external-sources/upstreams/dotnet-skills/dotnet-ai/skills/mcp-csharp-test/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1Bundled 2 files

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

C# MCP Server Testing

When to Use

Stop Signals

Inputs

Workflow

Step 1: Create the test project

Step 2: Write unit tests for tool methods

Track record

Benchmark

Adoption

SkillSafety

Source

Related skills