.NET: Harness: Improve prompts and add FileSystem store#5365
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westey-m merged 2 commits intomicrosoft:feature-harnessfrom Apr 21, 2026
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Pull request overview
This PR updates the .NET Harness experience by strengthening the agent-mode and research harness prompts, and introducing a new disk-backed AgentFileStore implementation for file memory persistence.
Changes:
- Added
FileSystemAgentFileStore(file-system-backedAgentFileStore) plus unit tests validating core behaviors and traversal rejection. - Updated
AgentModeProviderinstructions to better distinguish interactive “plan” vs autonomous “execute” behavior. - Updated the Harness research sample to use the file-system store and expanded the prompt guidance around planning, todo management, and file memory usage.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.
| File | Description |
|---|---|
| dotnet/src/Microsoft.Agents.AI/Harness/FileMemory/FileSystemAgentFileStore.cs | Adds a disk-backed AgentFileStore with path validation, listing, and regex search. |
| dotnet/tests/Microsoft.Agents.AI.UnitTests/Harness/FileMemory/FileSystemAgentFileStoreTests.cs | Adds unit tests for the new file-system store (CRUD, listing, search, traversal rejection). |
| dotnet/src/Microsoft.Agents.AI/Harness/AgentMode/AgentModeProvider.cs | Improves plan/execute mode instructions in the harness context. |
| dotnet/samples/02-agents/Harness/Harness_Step01_Research/Program.cs | Updates the research sample to use file-backed memory and enhanced operational prompts. |
peibekwe
approved these changes
Apr 20, 2026
lokitoth
approved these changes
Apr 20, 2026
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May 1, 2026
* .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>
This was referenced May 3, 2026
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