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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-testerskill 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 |
|---|---|
FOUNDRY_PROJECT_ENDPOINT |
Your Azure AI Foundry project endpoint |
FOUNDRY_MODEL |
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 |