Adding csharp BYO agent. (#573)

* Adding BYO agent.

* Prompt updates.

* remove.

* Some changes.

* Fixing form filler prompt to base prompt.

* PR coomments and a bug fix.

Author: mohitpavan

samples/csharp/hosted-agents/agent-framework/browser-automation/prompts/base.md

@@ -99,6 +99,7 @@ live browser.
 
 ## General browser work
 
+- **NEVER ASK FOR CONFIRMATION.** Execute tasks fully without pausing. Do NOT say "If you want, I can continue" or "Should I proceed?" — JUST DO IT. Complete the entire task end-to-end.
 - Clarify only when the goal, target URL, or required data is ambiguous.
 - Prefer inspecting page state before interacting with elements.
 - Use screenshots when visual confirmation would help the user understand the

samples/csharp/hosted-agents/agent-framework/browser-automation/utils/Middlewares.cs

@@ -171,7 +171,8 @@ public static async IAsyncEnumerable<AgentResponseUpdate> LiveViewUrlStreamingMi
             _logger.LogDebug("[streaming-middleware] Appending live_view_url");
             yield return new AgentResponseUpdate(
                 ChatRole.Assistant,
-                [new TextContent($"\n\n🔴 [Browser Live View]({liveViewUrl})")]);
+                [new TextContent($"\n\n🔴 [Browser Live View]({liveViewUrl})")])
+            { FinishReason = ChatFinishReason.Stop };
         }
     }
 }

samples/csharp/hosted-agents/bring-your-own/responses/browser-automation/.dockerignore

@@ -0,0 +1,34 @@
+# Build artifacts
+**/bin/
+**/obj/
+
+# .NET user secrets
+**/.secrets/
+
+# Local settings
+**/*.user
+**/*.suo
+
+# IDE settings
+.vs/
+.vscode/
+**/.idea/
+
+# Test results
+**/TestResults/
+
+# Version control
+.git/
+.gitignore
+
+# Docker files
+.dockerignore
+
+# Docs
+README.md
+
+# Local environment (never bake credentials into the image)
+.env
+
+# NuGet
+.nuget/

samples/csharp/hosted-agents/bring-your-own/responses/browser-automation/.env.example

@@ -0,0 +1,14 @@
+# Required
+# FOUNDRY_PROJECT_ENDPOINT=https://<account>.services.ai.azure.com/api/projects/<project>
+AZURE_AI_MODEL_DEPLOYMENT_NAME=gpt-4.1
+
+# Foundry Toolbox name (hardcoded in agent.manifest.yaml; override only if using a different toolbox)
+TOOLBOX_NAME=browser-automation-tools
+
+# Playwright workspace (used in agent.manifest.yaml for connection resource)
+# PLAYWRIGHT_SERVICE_URL=wss://<region>.api.playwright.microsoft.com/playwrightworkspaces/<workspace-id>/browsers
+# PLAYWRIGHT_SERVICE_RESOURCE_ID=/subscriptions/<sub-id>/resourceGroups/<rg>/providers/Microsoft.LoadTestService/playwrightWorkspaces/<name>
+# PLAYWRIGHT_SERVICE_ACCESS_TOKEN=<playwright-workspace-access-token>
+
+# Optional
+# BROWSER_TIMEOUT_SECONDS=180

samples/csharp/hosted-agents/bring-your-own/responses/browser-automation/Dockerfile

@@ -0,0 +1,23 @@
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS base
+WORKDIR /app
+EXPOSE 8088
+ENV ASPNETCORE_URLS=http://+:8088
+
+# Install Node.js and @playwright/cli
+RUN apt-get update && apt-get install -y curl && \
+    curl -fsSL https://deb.nodesource.com/setup_22.x | bash - && \
+    apt-get install -y nodejs && \
+    npm install -g @playwright/cli@latest && \
+    playwright-cli install --skills && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
+
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY . .
+RUN dotnet restore
+RUN dotnet publish -c Release -o /app/publish
+
+FROM base AS final
+WORKDIR /app
+COPY --from=build /app/publish .
+ENTRYPOINT ["dotnet", "browser-automation.dll"]