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.NET: Add sample to show how to build a harness - #5268
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westey (westey-m) merged 6 commits intoApr 15, 2026
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Pull request overview
Note
Copilot was unable to run its full agentic suite in this review.
Adds a new .NET console sample demonstrating how to assemble an “agent harness” around ChatClientAgent using built-in Harness context providers (planning, todos, mode) and a shared interactive console runner.
Changes:
- Added a new
Harnesssample group with a step-by-step research agent sample. - Introduced a shared console loop (
Harness_Shared_Console) for streaming output + tool call formatting + spinner + mode/todo commands. - Added a simple web-browsing tool that downloads HTML and converts it to markdown for the agent.
Reviewed changes
Copilot reviewed 11 out of 11 changed files in this pull request and generated 6 comments.
Show a summary per file
| File | Description |
|---|---|
| dotnet/samples/02-agents/README.md | Adds the Harness sample link to the samples index. |
| dotnet/samples/02-agents/Harness/README.md | Introduces the Harness samples landing page. |
| dotnet/samples/02-agents/Harness/Harness_Step01_Research/README.md | Documents prerequisites, env vars, and how to run the step-1 harness sample. |
| dotnet/samples/02-agents/Harness/Harness_Step01_Research/Program.cs | Implements the research agent using Foundry + Harness providers + web tools. |
| dotnet/samples/02-agents/Harness/Harness_Step01_Research/WebBrowsingTools.cs | Adds a URI download tool and HTML→Markdown conversion logic. |
| dotnet/samples/02-agents/Harness/Harness_Step01_Research/Harness_Step01_Research.csproj | Adds the step-1 sample project. |
| dotnet/samples/02-agents/Harness/Harness_Shared_Console/HarnessConsole.cs | Provides reusable interactive console runner for harness samples. |
| dotnet/samples/02-agents/Harness/Harness_Shared_Console/Spinner.cs | Adds console spinner used during streaming/tool calls. |
| dotnet/samples/02-agents/Harness/Harness_Shared_Console/ToolCallFormatter.cs | Adds human-readable tool call formatting for console output. |
| dotnet/samples/02-agents/Harness/Harness_Shared_Console/Harness_Shared_Console.csproj | Adds shared console helper project. |
| dotnet/agent-framework-dotnet.slnx | Adds the new Harness projects and README into the solution. |
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SergeyMenshykh
approved these changes
Apr 15, 2026
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westey (westey-m)
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* .NET: Add a TODO AIContextProvider (microsoft#5233) * Add a TODO AIContextProvider * Add unit tests * Address PR comments * Address PR comments * Fix test after removing one tool * .NET: Add a ModeProvider for managing agent modes (microsoft#5247) * Add a ModeProvider for managing agent modes * Fix typo * Fix typo * Fix typo * Address PR comments * .NET: Add sample to show how to build a harness (microsoft#5268) * Add sample to show how to build a harness * Improve sample * Sample max output tokens and model * Fix encoding * Fix model name in readme * Address PR comments * .NET: Add context window size compaction strategy for harness (microsoft#5304) * Add context window size compaction strategy for harness * Apply suggestions from code review Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Address PR comments --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * .NET: Add a file memory provider (microsoft#5315) * Add a file memory provider * Address PR comments * Fix review comments. * Add additional unit tests * Addressing PR comments. * .NET: Harness: Improve prompts and add FileSystem store (microsoft#5365) * Harness: Improve prompts and add FileSystem store * Address PR comments * .NET: Harness: Improve path validation (microsoft#5404) * Harness: Improve path validation * Address PR comments * .NET: Add always approve helpers, improve sample and fix bug (microsoft#5451) * Add always approve helpers, improve sample and fix bug * Address PR comments * .NET: Make Todo, Mode and FileMemory providers more configurable (microsoft#5477) * Make Todo, Mode and FileMemory providers more configurable * Address PR comments. * .NET: Add subagents provider and sample (microsoft#5518) * Add subagents provider and sample * Addressing PR comments. * .NET: Harness filememory index plus instructions consistency (microsoft#5540) * Add FileMemoryProvider index and improve instruction consistency * Address PR comments. * Address PR comments * Address PR comments. * Apply suggestion from @rogerbarreto Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com> --------- Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com> * .NET: Refactor harness console to be more extensible and easy to understand with better UX (microsoft#5573) * Refactor harness console to be more extensible and easy to understand with better UX. * Fix formatting issues. * Allow multiple clarifications in one response * Address PR comments * .NET: Add FileAccessProvdider and concurrency fix for FileMemoryProvider (microsoft#5583) * Add FileAccessProvdider and concurrency fix for FileMemoryProvider * Address PR comments --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: Roger Barreto <19890735+rogerbarreto@users.noreply.github.com>
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Motivation and Context
The sample is intended to show how to use a ChatClientAgent with the various AF built in components to demonstrate how to assemble your own agent harness.
Description
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