C# Runner MCP — C# Code Execution

C# Runner MCP server enabling AI agents to execute C# code snippets — running C# scripts via dotnet-script or similar runtime, capturing console output and return values, and integrating C# code execution into agent-driven .NET development, testing, and automation workflows.

Evaluated Mar 06, 2026 (0d ago) vcurrent

Homepage ↗ Repo ↗ Developer Tools csharp dotnet code-execution mcp-server scripting dotnet-script

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Local code execution. User permissions. Review AI-generated code before execution. Community MCP.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

A .NET developer needs AI agents to test and execute C# code snippets for rapid prototyping, algorithm testing, or .NET API validation.

Avoid When

You don't do .NET development, or need full application execution — use appropriate language-specific execution MCPs.

Use Cases

• Testing C# code snippets from .NET development agents
• Executing C# algorithms for data processing from analysis agents
• Validating .NET API usage from coding assistant agents
• Running C# scripts for automation from DevOps agents
• Prototyping .NET solutions quickly from rapid development agents
• Debugging C# logic in isolation from troubleshooting agents

Not For

• Full .NET application execution (this is script/snippet focused)
• Non-.NET developers (use Python or JavaScript execution MCPs)
• Production workload execution (snippet execution environment)

Interface

REST API

GraphQL

gRPC

MCP Server

Yes ↗

SDK

Webhooks

Authentication

Methods: none

OAuth: No Scopes: No

No authentication — local code execution using installed .NET runtime.

Pricing

Model: free

Free tier: Yes

Requires CC: No

Free, open source. .NET SDK is free. Community MCP from mcp-ecosystem org.

Agent Metadata

Pagination

none

Idempotent

Full

Retry Guidance

Not documented

Known Gotchas

⚠ .NET SDK must be installed — version 6.0+ recommended
⚠ dotnet-script or CSX compilation adds 1-5 seconds compile overhead per execution
⚠ NuGet package references in scripts may fail or require offline cache
⚠ Execution runs with user permissions — code can access local filesystem
⚠ Community MCP from mcp-ecosystem — good quality but niche .NET use case
⚠ Error messages from C# compiler can be verbose — agent must parse them correctly

Alternatives

mcp-python-interpreter mcp-sandbox mcp-server-jupyter

Full Evaluation Report

Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for C# Runner MCP — C# Code Execution.

$99

API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-03-06.