.NET: Add File Search Sample for Foundry Agents.#3990
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.NET: Add File Search Sample for Foundry Agents.#3990rogerbarreto wants to merge 5 commits intomicrosoft:mainfrom
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- 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>
- 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>
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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_FileSearchsample 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.slnxsolution.
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. |
dotnet/samples/GettingStarted/FoundryAgents/FoundryAgents_Step18_FileSearch/Program.cs
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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>
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SergeyMenshykh
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Feb 18, 2026
westey-m
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Feb 18, 2026
| |[Code interpreter](./FoundryAgents_Step14_CodeInterpreter/)|This sample demonstrates how to use the code interpreter tool with a Foundry agent| | ||
| |[Computer use](./FoundryAgents_Step15_ComputerUse/)|This sample demonstrates how to use computer use capabilities with a Foundry agent| | ||
| |[File search](./FoundryAgents_Step18_FileSearch/)|This sample demonstrates how to use the file search tool with a Foundry agent| | ||
| |[Local MCP](./FoundryAgents_Step27_LocalMCP/)|This sample demonstrates how to use a local MCP client with a Foundry agent| |
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Not related to this PR, so feel free to ignore or include in a follow up PR, but it doesn't look like step27 is in the solution.
westey-m
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Feb 18, 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
HostedFileSearchTool(MEAI + AgentFramework abstraction)ResponseTool.CreateFileSearchTool(Native SDK)Changes
FoundryAgents_Step18_FileSearchwithProgram.csandREADME.mdagent-framework-dotnet.slnxREADME.md