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westey afcb6b1a00 .NET: Harness code act skill sample (#5930 )

* Add sample that shows code execution and skills together

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afcb6b1a00 · 2026-05-19 15:49:03 +00:00

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skills/regex-tester

.NET: Harness code act skill sample (#5930 )

2026-05-19 15:49:03 +00:00

Harness_Step04_CodeExecution.csproj

.NET: Harness code act skill sample (#5930 )

2026-05-19 15:49:03 +00:00

Program.cs

.NET: Harness code act skill sample (#5930 )

2026-05-19 15:49:03 +00:00

README.md

.NET: Harness code act skill sample (#5930 )

2026-05-19 15:49:03 +00:00

README.md

Harness Step 04 — Code Execution (Hyperlight + Skills)

This sample demonstrates a HarnessAgent with all features enabled, plus:

Hyperlight CodeAct — sandboxed Python code execution via execute_code (requires KVM)
Skills — file-based skill discovery (a regex-tester skill is included)

The agent can plan tasks, manage modes, store memories, read/write files, search the web, approve sensitive operations, discover and use skills, and execute arbitrary Python code — all pre-configured by the HarnessAgent.

Prerequisites

.NET 10 SDK
An Azure AI Foundry project endpoint
KVM-capable host (the Hyperlight sandbox runs code in micro-VMs)

Environment Variables

Variable	Description
`AZURE_AI_PROJECT_ENDPOINT`	Your Azure AI Foundry project endpoint
`AZURE_AI_MODEL_DEPLOYMENT_NAME`	Model deployment name (default: `gpt-5.4`)

Running

dotnet run

What to Try

Regex testing: "Help me write a regex that matches valid email addresses, then test it against some examples."
Code execution: "Calculate the first 20 prime numbers using the Sieve of Eratosthenes."
Skill + code combo: "I need a regex for ISO 8601 dates — test it thoroughly with edge cases."

Included Skill

The skills/regex-tester/ skill instructs the agent to validate regex patterns by executing Python test code in the Hyperlight sandbox. It includes a regex cheatsheet as reference material.

Features Enabled

Feature	Description
TodoProvider	Task planning and tracking (`/todos` command)
AgentModeProvider	Mode switching (`/mode` command)
FileMemoryProvider	Persistent memory stored as files
FileAccessProvider	Read/write files in a working directory
ToolApproval	Don't-ask-again approval for sensitive tools
WebSearch	Built-in hosted web search
AgentSkillsProvider	Discovers and uses skills from the `skills/` folder
HyperlightCodeActProvider	Sandboxed Python execution via `execute_code`
OpenTelemetry	Trace logging to a text file