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.NET: Add File Search Sample for Foundry Agents. by rogerbarreto · Pull Request #3990 · microsoft/agent-framework · GitHub
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.NET: Add File Search Sample for Foundry Agents. - #3990

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Roger Barreto (rogerbarreto) merged 6 commits into
microsoft:mainfrom
rogerbarreto:feature/3674-file-search
Feb 19, 2026
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.NET: Add File Search Sample for Foundry Agents.#3990
Roger Barreto (rogerbarreto) merged 6 commits into
microsoft:mainfrom
rogerbarreto:feature/3674-file-search

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@rogerbarreto Roger Barreto (rogerbarreto) commented Feb 17, 2026 •
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Motivation and Context

Adds a new FoundryAgents_Step18_FileSearch sample demonstrating how to use the File Search tool with AI Agents.

Description

  • Upload files and create vector stores in Azure Foundry
  • Create agents with file search capabilities using two approaches:
    • Option 1: HostedFileSearchTool (MEAI + AgentFramework abstraction)
    • Option 2: ResponseTool.CreateFileSearchTool (Native SDK)
  • Handle file citation annotations from agent responses
  • Manage full resource lifecycle (create and cleanup)

Changes

  • New sample: FoundryAgents_Step18_FileSearch with Program.cs and README.md
  • Added project to agent-framework-dotnet.slnx
  • Added entry to FoundryAgents samples table in parent README.md

@rogerbarreto
.NET: Add File Search sample microsoft#3674
227fc9c
@rogerbarreto
Merge branch 'main' of https://github.com/microsoft/agent-framework i…
bd2df43 
…nto feature/3674-file-search
@rogerbarreto
Add FileSearch sample to solution and parent README
c5ad8ec 
- Add FoundryAgents_Step18_FileSearch to agent-framework-dotnet.slnx
- Add FileSearch entry to FoundryAgents samples table in README.md
- Fix README inaccuracy: sample creates one agent, not two

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@rogerbarreto
Refactor FileSearch sample: local functions + DefaultAzureCredential
573af2b 
- Refactor agent creation into switchable local functions
- Use DefaultAzureCredential with WARNING comment (matching other samples)
- Update README to reference DefaultAzureCredential

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot AI review requested due to automatic review settings February 17, 2026 13:45
@markwallace-microsoft Mark Wallace (markwallace-microsoft) added documentation Usage: [Issues, PRs], Target: documentation in the code base and learn docs .NET Usage: [Issues, PRs], Target: .Net labels Feb 17, 2026
@github-actions github-actions Bot changed the title .Net: Add File Search Sample for Foundry Agents. .NET: Add File Search Sample for Foundry Agents. Feb 17, 2026
Copilot AI reviewed Feb 17, 2026
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Pull request overview

Adds a new .NET “File search” getting-started sample under Foundry Agents, documenting and wiring it into the sample index/solution so developers can see how to use vector stores + file search tools with the Agent Framework and the native SDK.

Changes:

  • Adds FoundryAgents_Step18_FileSearch sample project (code + README) demonstrating file upload, vector store creation, and file-search-enabled agent execution.
  • Updates the Foundry Agents samples README to include the new sample link.
  • Adds the new sample project to the dotnet/agent-framework-dotnet.slnx solution.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file
File Description
dotnet/samples/GettingStarted/FoundryAgents/README.md Adds the new “File search” sample to the samples table.
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step18_FileSearch/README.md Documents prerequisites, environment variables, and expected behavior for the new sample.
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step18_FileSearch/Program.cs Implements the end-to-end file upload → vector store → agent run → citation display → cleanup flow.
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step18_FileSearch/FoundryAgents_Step18_FileSearch.csproj Introduces the new sample project and references required packages/projects.
dotnet/agent-framework-dotnet.slnx Adds the new sample project to the solution.

Comment thread dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step18_FileSearch/Program.cs Resolved
Comment thread dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step18_FileSearch/Program.cs Resolved
@rogerbarreto
Fix orphaned temp file in FileSearch sample
9c4d0a9 
Use Path.Combine + Path.GetRandomFileName instead of Path.GetTempFileName
to avoid leaving an orphaned temp file on disk.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
westey-m
westey (westey-m) reviewed Feb 18, 2026
View reviewed changes
Comment thread dotnet/samples/GettingStarted/FoundryAgents/README.md Resolved
@rogerbarreto
Roger Barreto (rogerbarreto) added this pull request to the merge queue Feb 19, 2026
Merged via the queue into microsoft:main with commit 5aa05eb Feb 19, 2026
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integration — 7a40f8aa Deployed Feb 19, 2026 by rogerbarreto via dotnet-build-and-test (net10.0, ubuntu-latest, Release, true, integration) #12390
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@SergeyMenshykh SergeyMenshykh SergeyMenshykh approved these changes
@westey-m westey (westey-m) westey-m approved these changes

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documentation Usage: [Issues, PRs], Target: documentation in the code base and learn docs .NET Usage: [Issues, PRs], Target: .Net

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@rogerbarreto @SergeyMenshykh @westey-m @markwallace-microsoft