.NET: Add Hosted-AgentSkills sample with Foundry Skills integration (#6013)

* .NET: Add Hosted-AgentSkills sample for Foundry Skills integration Add a new hosted agent sample that demonstrates how to load behavioral guidelines from Foundry Skills at startup using AgentSkillsProvider and the progressive disclosure pattern (advertise -> load on demand). The sample: - Downloads SKILL.md files from Foundry via ProjectAgentSkills SDK - Extracts ZIP archives with zip-slip protection - Wires skills into AgentSkillsProvider as an AIContextProvider - Hosts the agent via the Responses protocol Ships two Contoso Outdoors skills matching the Python sample (PR #5822): - support-style: tone, formatting, signature guidelines - escalation-policy: when and how to escalate tickets Includes convenience provisioning gated behind PROVISION_SAMPLE_SKILLS env var, clearly documented as NOT a production pattern. Closes #5776 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * .NET: Add unit tests and integration test for Hosted-AgentSkills Unit tests (14 tests, all passing): - ZIP extraction with zip-slip guard (valid archive, traversal attack, sibling-prefix attack, directory entries) - Skill name validation (rejects dots, separators, traversal patterns) - AgentSkillsProvider with downloaded skills (advertises both skills, load_skill returns canary tokens, unknown skill returns error) Container integration test: - New 'agent-skills' scenario in the test container that creates Contoso Outdoors skills on disk and wires AgentSkillsProvider - AgentSkillsHostedAgentFixture + 4 integration tests verifying: - Routine questions load support-style skill (STYLE-CANARY-3318) - Escalation triggers load escalation-policy (ESC-CANARY-7742) - Skills are advertised in system prompt - load_skill tool is invoked via FunctionCallContent Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * .NET: Add smoke test, bootstrap, and docs for agent-skills integration - Add scripts/smoke.ps1 for local Docker smoke testing: builds the contributor image, runs the container, verifies both skills are loaded via canary tokens (STYLE-CANARY-3318, ESC-CANARY-7742) - Add 'agent-skills' to the bootstrap script scenario list - Add agent-skills row to the integration test README scenarios table - Exclude HostedAgentSkillsPatternTests from net472 (uses net8.0+ APIs) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * .NET: Update commented-out package versions to latest across all hosted samples Update the end-user PackageReference versions (in the commented-out sections) from 1.0.0 to the current latest NuGet versions: - Microsoft.Agents.AI: 1.6.1 - Microsoft.Agents.AI.Foundry: 1.6.1-preview.260514.1 - Microsoft.Agents.AI.Foundry.Hosting: 1.6.1-preview.260514.1 - Microsoft.Agents.AI.Hosting: 1.6.1-preview.260514.1 - Microsoft.Agents.AI.OpenAI: 1.6.1 - Microsoft.Agents.AI.Workflows: 1.6.1 Also adds explicit versions to Hosted-Workflow-Handoff which had bare PackageReference entries without Version attributes. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * .NET: Fix broken markdown links in Hosted-AgentSkills README Remove references to non-existent ../../README.md. Replace with inline instructions matching other hosted samples that don't have a parent README. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * .NET: Use OS-appropriate string comparison in zip-slip guard Use Ordinal on Unix (case-sensitive FS) and OrdinalIgnoreCase on Windows to prevent case-based path bypass on Linux containers. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-06-16 21:04:09 +08:00 · 2026-05-25 10:32:04 +01:00
parent de6d0267f2
commit dc4bafbc1e
32 changed files with 1148 additions and 32 deletions
@@ -359,6 +359,9 @@
  <Folder Name="/Samples/04-hosting/FoundryHostedAgents/responses/Hosted-Workflow-Handoff/">
    <Project Path="samples/04-hosting/FoundryHostedAgents/responses/Hosted-Workflow-Handoff/HostedWorkflowHandoff.csproj" />
  </Folder>
+  <Folder Name="/Samples/04-hosting/FoundryHostedAgents/responses/Hosted-AgentSkills/">
+    <Project Path="samples/04-hosting/FoundryHostedAgents/responses/Hosted-AgentSkills/HostedAgentSkills.csproj" />
+  </Folder>
  <Folder Name="/Samples/04-hosting/DurableAgents/" />
  <Folder Name="/Samples/04-hosting/DurableAgents/AzureFunctions/">
    <File Path="samples/04-hosting/DurableAgents/AzureFunctions/.editorconfig" />
@@ -0,0 +1,14 @@
+AZURE_AI_PROJECT_ENDPOINT=<your-azure-ai-project-endpoint>
+ASPNETCORE_URLS=http://+:8088
+ASPNETCORE_ENVIRONMENT=Development
+AZURE_AI_MODEL_DEPLOYMENT_NAME=gpt-4o
+AGENT_NAME=hosted-agent-skills
+SKILL_NAMES=support-style,escalation-policy
+# Set to true to provision sample skills to Foundry on startup (first-run convenience).
+# In production, skills are provisioned externally — leave this unset or false.
+PROVISION_SAMPLE_SKILLS=true
+AZURE_BEARER_TOKEN=DefaultAzureCredential
+# When running outside the Foundry platform the platform-injected isolation keys are absent.
+# These two variables provide fallback values for local Docker debugging only.
+HOSTED_USER_ISOLATION_KEY=local-dev-user
+HOSTED_CHAT_ISOLATION_KEY=local-dev-chat
@@ -0,0 +1,26 @@
+# Dockerfile for end-users consuming the Agent Framework via NuGet packages.
+#
+# This Dockerfile performs a full `dotnet restore` and `dotnet publish` inside the container,
+# which only succeeds when the project references its dependencies via PackageReference (see the
+# commented-out section in HostedAgentSkills.csproj). Contributors building from the
+# agent-framework repository source must use Dockerfile.contributor instead because
+# ProjectReference dependencies live outside this folder and cannot be restored from inside
+# this build context.
+#
+# Use the official .NET 10.0 ASP.NET runtime as a parent image
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS base
+WORKDIR /app
+
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY . .
+RUN dotnet restore
+RUN dotnet publish -c Release -o /app/publish
+
+# Final stage
+FROM base AS final
+WORKDIR /app
+COPY --from=build /app/publish .
+EXPOSE 8088
+ENV ASPNETCORE_URLS=http://+:8088
+ENTRYPOINT ["dotnet", "HostedAgentSkills.dll"]
@@ -0,0 +1,23 @@
+# Dockerfile for contributors building from the agent-framework repository source.
+#
+# This project uses ProjectReference to the local Microsoft.Agents.AI source,
+# which means a standard multi-stage Docker build cannot resolve dependencies outside
+# this folder. Instead, pre-publish the app targeting the container runtime and copy
+# the output into the container:
+#
+#   dotnet publish -c Debug -f net10.0 -r linux-musl-x64 --self-contained false -o out
+#   docker build -f Dockerfile.contributor -t hosted-agent-skills .
+#   docker run --rm -p 8088:8088 \
+#     -e AGENT_NAME=hosted-agent-skills \
+#     -e HOSTED_USER_ISOLATION_KEY=alice \
+#     -e HOSTED_CHAT_ISOLATION_KEY=alice-chat-1 \
+#     --env-file .env hosted-agent-skills
+#
+# For end-users consuming the NuGet package (not ProjectReference), use the standard
+# Dockerfile which performs a full dotnet restore + publish inside the container.
+FROM mcr.microsoft.com/dotnet/aspnet:10.0-alpine AS final
+WORKDIR /app
+COPY out/ .
+EXPOSE 8088
+ENV ASPNETCORE_URLS=http://+:8088
+ENTRYPOINT ["dotnet", "HostedAgentSkills.dll"]
@@ -0,0 +1,40 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFrameworks>net10.0</TargetFrameworks>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <CentralPackageTransitivePinningEnabled>false</CentralPackageTransitivePinningEnabled>
+    <RootNamespace>HostedAgentSkills</RootNamespace>
+    <AssemblyName>HostedAgentSkills</AssemblyName>
+    <NoWarn>$(NoWarn);MEAI001;OPENAI001;AAIP001</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.AI.Projects" />
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="DotNetEnv" />
+  </ItemGroup>
+
+  <!-- For contributors: uses ProjectReference to build against local source -->
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\..\src\Microsoft.Agents.AI\Microsoft.Agents.AI.csproj" />
+    <ProjectReference Include="..\..\..\..\..\src\Microsoft.Agents.AI.Foundry\Microsoft.Agents.AI.Foundry.csproj" />
+    <ProjectReference Include="..\..\..\..\..\src\Microsoft.Agents.AI.Foundry.Hosting\Microsoft.Agents.AI.Foundry.Hosting.csproj" />
+    <ProjectReference Include="..\Hosted_Shared_Contributor_Setup\Hosted_Shared_Contributor_Setup.csproj" />
+  </ItemGroup>
+
+  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReferences above
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Agents.AI" Version="1.6.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
+  </ItemGroup>
+  -->
+
+  <!-- Include the skills/ directory in the publish output so the sample can provision them -->
+  <ItemGroup>
+    <None Include="skills\**\*" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+
+</Project>
@@ -0,0 +1,215 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+// Hosted-AgentSkills
+//
+// Demonstrates how to host an agent that loads its behavioral guidelines from Foundry Skills at
+// startup. Skills are authored as SKILL.md files, uploaded to Foundry via the Skills REST API,
+// and downloaded by the agent on boot so guideline updates ship without code changes.
+//
+// The agent uses AgentSkillsProvider from the Agent Framework which implements the progressive
+// disclosure pattern from the Agent Skills specification (https://agentskills.io/):
+//   1. Advertise — skill names and descriptions are injected into the system prompt.
+//   2. Load — the model calls load_skill to retrieve the full SKILL.md body on demand.
+//
+// IMPORTANT: In production, skill provisioning (uploading SKILL.md files to Foundry) is an
+// external concern — it is NOT the hosted agent's responsibility. The provisioning helper below
+// is included for sample convenience only, so the sample is self-contained and runnable without
+// a separate setup step. A real deployment pipeline would provision skills separately (e.g., via
+// a CI/CD step, a CLI script, or a management portal).
+
+#pragma warning disable AAIP001 // ProjectAgentSkills is experimental
+
+using System.ClientModel;
+using System.IO.Compression;
+using Azure.AI.Projects;
+using Azure.AI.Projects.Agents;
+using Azure.Core;
+using Azure.Identity;
+using DotNetEnv;
+using Hosted_Shared_Contributor_Setup;
+using Microsoft.Agents.AI;
+using Microsoft.Agents.AI.Foundry.Hosting;
+using Microsoft.Extensions.AI;
+
+// Load .env file if present (for local development)
+Env.TraversePath().Load();
+
+string endpoint = Environment.GetEnvironmentVariable("AZURE_AI_PROJECT_ENDPOINT")
+    ?? throw new InvalidOperationException("AZURE_AI_PROJECT_ENDPOINT is not set.");
+string deploymentName = Environment.GetEnvironmentVariable("AZURE_AI_MODEL_DEPLOYMENT_NAME") ?? "gpt-4o";
+string skillNames = Environment.GetEnvironmentVariable("SKILL_NAMES")
+    ?? throw new InvalidOperationException("SKILL_NAMES is not set. Provide a comma-separated list of skill names (e.g., support-style,escalation-policy).");
+
+string[] requestedSkills = skillNames.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+if (requestedSkills.Length == 0)
+{
+    throw new InvalidOperationException("SKILL_NAMES must list at least one skill name.");
+}
+
+// Validate skill names to prevent path traversal.
+foreach (string name in requestedSkills)
+{
+    if (name.Contains('.') || name.Contains('/') || name.Contains('\\') || Path.IsPathRooted(name))
+    {
+        throw new InvalidOperationException(
+            $"Invalid skill name '{name}': skill names must not contain path separators or dots.");
+    }
+}
+
+// Use a chained credential: try a temporary dev token first (for local Docker debugging),
+// then fall back to DefaultAzureCredential (for local dev via dotnet run / managed identity in production).
+TokenCredential credential = new ChainedTokenCredential(
+    new DevTemporaryTokenCredential(),
+    new DefaultAzureCredential());
+
+AIProjectClient projectClient = new(new Uri(endpoint), credential);
+ProjectAgentSkills skillsClient = projectClient.AgentAdministrationClient.GetAgentSkills();
+
+// ── Provision skills (sample convenience only — NOT a production pattern) ─────
+// In production, skills are provisioned externally (e.g., via CI/CD or a management script).
+// This helper ensures the sample's SKILL.md files exist in Foundry so the sample is runnable
+// out of the box without a separate setup step. Set PROVISION_SAMPLE_SKILLS=true to enable.
+string sourceSkillsDir = Path.Combine(AppContext.BaseDirectory, "skills");
+bool provisionEnabled = string.Equals(
+    Environment.GetEnvironmentVariable("PROVISION_SAMPLE_SKILLS"), "true", StringComparison.OrdinalIgnoreCase);
+if (provisionEnabled && Directory.Exists(sourceSkillsDir))
+{
+    await EnsureSkillsProvisionedAsync(skillsClient, sourceSkillsDir, requestedSkills);
+}
+
+// ── Download skills from Foundry ─────────────────────────────────────────────
+// Pull the latest copy of each skill from Foundry into a runtime-only folder.
+// This directory is recreated on every startup so the agent always picks up
+// the latest version of each skill.
+string downloadedSkillsDir = Path.Combine(AppContext.BaseDirectory, "downloaded_skills");
+await DownloadSkillsAsync(skillsClient, requestedSkills, downloadedSkillsDir);
+
+// ── Wire skills into the agent ───────────────────────────────────────────────
+// AgentSkillsProvider implements progressive disclosure: skill names and descriptions
+// are advertised in the system prompt (~100 tokens per skill), and the full SKILL.md
+// body is loaded on demand when the model calls the load_skill tool.
+AgentSkillsProvider skillsProvider = new(downloadedSkillsDir);
+
+ChatClientAgent agent = projectClient.AsAIAgent(new ChatClientAgentOptions
+{
+    Name = Environment.GetEnvironmentVariable("AGENT_NAME") ?? "hosted-agent-skills",
+    ChatOptions = new ChatOptions
+    {
+        ModelId = deploymentName,
+        Instructions = "You are a customer-support assistant for Contoso Outdoors.",
+    },
+    AIContextProviders = [skillsProvider]
+});
+
+// Host the agent as a Foundry Hosted Agent using the Responses API.
+var builder = WebApplication.CreateBuilder(args);
+builder.Services.AddFoundryResponses(agent);
+builder.Services.AddDevTemporaryLocalContributorSetup(); // Local Docker debugging only - must not be used in production.
+
+var app = builder.Build();
+app.MapFoundryResponses();
+
+// Contributor-only: in Development, also map the per-agent OpenAI route shape that live Foundry uses
+// so a local REPL client can target this server via AIProjectClient.AsAIAgent(Uri agentEndpoint).
+// Do not use this in production. Hosted Foundry agents only support the agent-endpoint path.
+app.MapDevTemporaryLocalAgentEndpoint();
+
+app.Run();
+
+// ── Helpers ──────────────────────────────────────────────────────────────────
+
+// Downloads each named skill from Foundry and extracts the ZIP archive into a
+// separate subdirectory under the target directory.
+static async Task DownloadSkillsAsync(ProjectAgentSkills skillsClient, string[] skillNames, string targetDir)
+{
+    if (Directory.Exists(targetDir))
+    {
+        Directory.Delete(targetDir, recursive: true);
+    }
+
+    Directory.CreateDirectory(targetDir);
+
+    foreach (string name in skillNames)
+    {
+        Console.WriteLine($"Downloading skill '{name}' from Foundry...");
+        BinaryData zipData = await skillsClient.DownloadSkillAsync(name);
+
+        string skillDir = Path.Combine(targetDir, name);
+        Directory.CreateDirectory(skillDir);
+
+        using var zipStream = zipData.ToStream();
+        using var archive = new ZipArchive(zipStream, ZipArchiveMode.Read);
+        SafeExtractZip(archive, skillDir);
+
+        if (!File.Exists(Path.Combine(skillDir, "SKILL.md")))
+        {
+            throw new InvalidOperationException(
+                $"Downloaded archive for '{name}' did not contain a SKILL.md at the root.");
+        }
+    }
+}
+
+// Extracts a ZIP archive into a destination directory, rejecting entries that would
+// escape the target path (zip-slip guard).
+static void SafeExtractZip(ZipArchive archive, string destinationDir)
+{
+    string destRoot = Path.GetFullPath(destinationDir);
+    string destRootWithSep = Path.EndsInDirectorySeparator(destRoot)
+        ? destRoot
+        : destRoot + Path.DirectorySeparatorChar;
+
+    // Use ordinal comparison on Unix (case-sensitive FS) and ordinal-ignore-case on Windows.
+    var comparison = OperatingSystem.IsWindows()
+        ? StringComparison.OrdinalIgnoreCase
+        : StringComparison.Ordinal;
+
+    foreach (ZipArchiveEntry entry in archive.Entries)
+    {
+        string entryPath = Path.GetFullPath(Path.Combine(destRoot, entry.FullName));
+        if (!entryPath.StartsWith(destRootWithSep, comparison)
+            && !string.Equals(entryPath, destRoot, comparison))
+        {
+            throw new InvalidOperationException(
+                $"Refusing to extract unsafe path '{entry.FullName}' outside of '{destRoot}'.");
+        }
+
+        if (string.IsNullOrEmpty(entry.Name))
+        {
+            // Directory entry — ensure it exists.
+            Directory.CreateDirectory(entryPath);
+        }
+        else
+        {
+            Directory.CreateDirectory(Path.GetDirectoryName(entryPath)!);
+            entry.ExtractToFile(entryPath, overwrite: true);
+        }
+    }
+}
+
+// Ensures each requested skill is provisioned in Foundry. For each skill name, checks whether
+// the skill exists and uploads it from the local source directory if it does not.
+//
+// This is a sample convenience helper — in production, skill provisioning is an external concern.
+static async Task EnsureSkillsProvisionedAsync(ProjectAgentSkills skillsClient, string sourceDir, string[] skillNames)
+{
+    foreach (string name in skillNames)
+    {
+        string skillPath = Path.Combine(sourceDir, name);
+        if (!Directory.Exists(skillPath) || !File.Exists(Path.Combine(skillPath, "SKILL.md")))
+        {
+            continue; // No local source for this skill — skip provisioning.
+        }
+
+        try
+        {
+            await skillsClient.GetSkillAsync(name);
+            Console.WriteLine($"Skill '{name}' already exists in Foundry.");
+        }
+        catch (ClientResultException ex) when (ex.Status == 404)
+        {
+            Console.WriteLine($"Provisioning skill '{name}' from {skillPath}...");
+            AgentsSkill imported = await skillsClient.CreateSkillFromPackageAsync(skillPath);
+            Console.WriteLine($"  Imported skill '{imported.Name}' (id={imported.SkillId}, has_blob={imported.HasBlob}).");
+        }
+    }
+}
@@ -0,0 +1,109 @@
+# What this sample demonstrates
+
+An [Agent Framework](https://github.com/microsoft/agent-framework) agent that loads its behavioral guidelines from [**Foundry Skills**](https://learn.microsoft.com/en-us/azure/foundry/agents/how-to/tools/skills) at startup, hosted using the **Responses protocol**. Skills are authored once as `SKILL.md` files, uploaded to your Foundry project through the Skills REST API, and downloaded by the agent on boot so updates ship without code changes.
+
+## How It Works
+
+### Authoring skills
+
+Each skill is a Markdown file with a YAML front matter block. This sample ships two source skills under [`skills/`](skills/):
+
+| Skill | Purpose |
+|---|---|
+| [`support-style`](skills/support-style/SKILL.md) | Voice, formatting, and signature rules for Contoso Outdoors support replies. |
+| [`escalation-policy`](skills/escalation-policy/SKILL.md) | When and how to escalate a customer ticket. |
+
+Each `SKILL.md` includes a unique `*-CANARY-*` token that the model is asked to echo, so you can prove the skill was loaded from Foundry (not hallucinated) by checking the response.
+
+> The `name` and `description` values in the YAML front matter must be **unquoted** — quoting them causes the Skills REST API to return HTTP 500 on import.
+
+### Uploading skills
+
+The sample includes a convenience provisioning step that checks whether each skill exists in Foundry and uploads it if not, gated behind the `PROVISION_SAMPLE_SKILLS=true` env var. **In production, skill provisioning is an external concern** — it is NOT the hosted agent's responsibility. A real deployment pipeline would provision skills separately (e.g., via a CI/CD step, a CLI script, or a management portal).
+
+The provisioning uses `ProjectAgentSkills.CreateSkillFromPackageAsync(directoryPath)` from the `Azure.AI.Projects.Agents` SDK. The method packages the `SKILL.md` file as a ZIP and uploads it to Foundry.
+
+### Downloading skills at agent startup
+
+[`Program.cs`](Program.cs) reads the comma-separated `SKILL_NAMES` env var and for each skill name downloads the ZIP archive from Foundry via `ProjectAgentSkills.DownloadSkillAsync(name)`, then unpacks it into a **separate runtime directory** at `downloaded_skills/<name>/` (kept distinct from the static `skills/` source folder).
+
+An [`AgentSkillsProvider`](../../../../../src/Microsoft.Agents.AI/Skills/AgentSkillsProvider.cs) is then built over `downloaded_skills/` and attached to the agent as a context provider. The provider follows the [Agent Skills](https://agentskills.io/) progressive-disclosure pattern:
+
+1. **Advertise** — skill names and descriptions are injected into the system prompt at session start (~100 tokens per skill).
+2. **Load** — the model calls the `load_skill` tool when it decides a skill is relevant to the user's turn, and the full `SKILL.md` body is returned.
+
+This means the model only pays the token cost for a skill's full body when it actually needs it, and updating a skill in Foundry + restarting the agent is enough to pick up the change — no code redeploy required.
+
+> **Note:** This sample supports instruction-only and resource-based skills. If your downloaded skills contain scripts, add a script runner when constructing the `AgentSkillsProvider`.
+
+### Agent Hosting
+
+The agent is hosted using the [Agent Framework](https://github.com/microsoft/agent-framework) with the Responses API hosting layer (`AddFoundryResponses` / `MapFoundryResponses`).
+
+## Prerequisites
+
+- An Azure AI Foundry project with a deployed model (e.g., `gpt-4o`)
+- Azure CLI logged in (`az login`)
+
+### Required RBAC
+
+Your identity (or the Managed Identity running the container in production) needs **Azure AI User** on the Foundry project scope. This single role covers both authoring skills and downloading them.
+
+## Running the Agent Host
+
+Set the required environment variables and run the sample with `dotnet run`:
+
+```bash
+export AZURE_AI_PROJECT_ENDPOINT="https://<account>.services.ai.azure.com/api/projects/<project>"
+export AZURE_AI_MODEL_DEPLOYMENT_NAME="gpt-4o"
+export SKILL_NAMES="support-style,escalation-policy"
+export PROVISION_SAMPLE_SKILLS="true"   # First run only — provisions skills to Foundry
+```
+
+Or in PowerShell:
+
+```powershell
+$env:SKILL_NAMES="support-style,escalation-policy"
+$env:PROVISION_SAMPLE_SKILLS="true"     # First run only — provisions skills to Foundry
+```
+
+You can also place these in a `.env` file next to `Program.cs` — see [`.env.example`](.env.example).
+
+On startup you should see:
+
+```text
+Skill 'support-style' already exists in Foundry.
+Skill 'escalation-policy' already exists in Foundry.
+Downloading skill 'support-style' from Foundry...
+Downloading skill 'escalation-policy' from Foundry...
+```
+
+The downloaded `SKILL.md` files land under `downloaded_skills/<name>/SKILL.md` next to the published output. This directory is recreated from scratch on every run, so deleting it manually is never necessary.
+
+## Interacting with the agent
+
+> Send a POST request to the server with a JSON body containing an `"input"` field to interact with the agent. For example:
+
+```bash
+curl -X POST http://localhost:8088/responses -H "Content-Type: application/json" -d '{"input": "Hi, I am Alex. I just want to confirm I can return my tent within 30 days."}'
+curl -X POST http://localhost:8088/responses -H "Content-Type: application/json" -d '{"input": "I want a $750 refund on Order #A-1042 right now or I am calling my lawyer."}'
+```
+
+| Prompt mentions | Skill that should drive the response |
+|---|---|
+| Routine return / shipping / care question | Model loads `support-style` (canary `STYLE-CANARY-3318`) — no escalation. |
+| Injury, legal threat, press, or refund > $500 | Model loads `escalation-policy` (canary `ESC-CANARY-7742`) **and** `support-style`. |
+
+Because skills are loaded on demand, the canary token in a response also proves the model actually invoked `load_skill` for the matching skill (not just saw its name in the advertised list).
+
+## Deploying the Agent to Foundry
+
+When deploying to Foundry, make sure `SKILL_NAMES` is set in your `azd` environment so it gets injected into the hosted container per [`agent.manifest.yaml`](agent.manifest.yaml):
+
+```bash
+azd env set SKILL_NAMES "support-style,escalation-policy"
+```
+
+The deployed agent's Managed Identity needs **Azure AI User** on the Foundry project to download skills at startup.
+
+> The `skills/` source folder is **not** deployed to Foundry — only the downloaded skills are used at runtime. The provisioning step must have been run against the same Foundry project before the agent can download the skills.
@@ -0,0 +1,41 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/microsoft/AgentSchema/refs/heads/main/schemas/v1.0/AgentManifest.yaml
+name: hosted-agent-skills
+displayName: "Hosted Agent Skills"
+
+description: >
+  An Agent Framework agent that downloads its behavioral guidelines from the Foundry
+  Skills REST API at startup, demonstrating how to decouple behavioral guidelines
+  (tone, escalation policy, etc.) from agent code using AgentSkillsProvider.
+
+metadata:
+  tags:
+    - AI Agent Hosting
+    - Azure AI AgentServer
+    - Responses Protocol
+    - Agent Framework
+    - Agent Skills
+    - Foundry Skills
+
+template:
+  name: hosted-agent-skills
+  kind: hosted
+  protocols:
+    - protocol: responses
+      version: 1.0.0
+  resources:
+    cpu: "0.25"
+    memory: 0.5Gi
+  environment_variables:
+    - name: AZURE_AI_MODEL_DEPLOYMENT_NAME
+      value: "{{AZURE_AI_MODEL_DEPLOYMENT_NAME}}"
+    - name: SKILL_NAMES
+      value: "{{SKILL_NAMES}}"
+parameters:
+  properties:
+    - name: SKILL_NAMES
+      secret: false
+      description: Comma-separated list of Foundry skill names to download at startup (e.g., support-style,escalation-policy)
+resources:
+  - kind: model
+    id: gpt-4.1-mini
+    name: AZURE_AI_MODEL_DEPLOYMENT_NAME
@@ -0,0 +1,14 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/microsoft/AgentSchema/refs/heads/main/schemas/v1.0/ContainerAgent.yaml
+kind: hosted
+name: hosted-agent-skills
+protocols:
+  - protocol: responses
+    version: 1.0.0
+resources:
+  cpu: "0.25"
+  memory: 0.5Gi
+environment_variables:
+  - name: AZURE_AI_MODEL_DEPLOYMENT_NAME
+    value: ${AZURE_AI_MODEL_DEPLOYMENT_NAME}
+  - name: SKILL_NAMES
+    value: ${SKILL_NAMES}
@@ -0,0 +1,100 @@
+#requires -Version 7
+<#
+.SYNOPSIS
+  Local smoke test for the Hosted-AgentSkills sample.
+.DESCRIPTION
+  Publishes the sample, builds the contributor Docker image, runs the container, drives
+  two conversations via curl invocations, and asserts that the agent loaded the correct
+  Foundry Skill for each prompt (verified via canary tokens in the response).
+  Exits non-zero on failure.
+
+  Prerequisites:
+    - Docker
+    - az login (token is fetched from the host)
+    - .env populated with AZURE_AI_PROJECT_ENDPOINT and model deployment
+    - Skills provisioned to Foundry (set PROVISION_SAMPLE_SKILLS=true on first run)
+.NOTES
+  This script is for local Docker debugging only. The Foundry platform supplies the
+  isolation keys for every inbound request in production and the dev fallback used here
+  must not be enabled in production deployments.
+#>
+
+[CmdletBinding()]
+param(
+    [int]$Port = 8088,
+    [string]$ImageName = 'hosted-agent-skills-smoke',
+    [string]$ContainerName = 'hosted-agent-skills-smoke'
+)
+
+$ErrorActionPreference = 'Stop'
+Set-Location -Path $PSScriptRoot/..
+
+if (-not (Test-Path .env)) {
+    throw '.env not found. Copy .env.example to .env and fill in AZURE_AI_PROJECT_ENDPOINT.'
+}
+
+Write-Host '==> Publishing sample for linux-musl-x64 ...'
+dotnet publish -c Debug -f net10.0 -r linux-musl-x64 --self-contained false -o out --tl:off | Out-Host
+if ($LASTEXITCODE -ne 0) { throw 'dotnet publish failed.' }
+
+Write-Host '==> Building docker image ...'
+docker build -f Dockerfile.contributor -t $ImageName . | Out-Host
+if ($LASTEXITCODE -ne 0) { throw 'docker build failed.' }
+
+Write-Host '==> Fetching bearer token ...'
+$bearer = az account get-access-token --resource https://ai.azure.com --query accessToken -o tsv
+if (-not $bearer) { throw 'Failed to obtain bearer token. Run az login.' }
+
+function Start-Container {
+    docker rm -f $ContainerName 2>$null | Out-Null
+    docker run -d --name $ContainerName -p ${Port}:8088 `
+        -e AGENT_NAME=hosted-agent-skills `
+        -e AZURE_BEARER_TOKEN=$bearer `
+        -e HOSTED_USER_ISOLATION_KEY=smoke-user `
+        -e HOSTED_CHAT_ISOLATION_KEY=smoke-chat-1 `
+        --env-file .env `
+        $ImageName | Out-Host
+    if ($LASTEXITCODE -ne 0) { throw "docker run failed." }
+    # Wait for the server to start and download skills from Foundry.
+    Write-Host '  Waiting for startup (skill download + server ready) ...'
+    Start-Sleep -Seconds 15
+}
+
+function Invoke-Agent([string]$Prompt, [string]$PreviousResponseId = $null) {
+    $body = @{ input = $Prompt; model = 'hosted-agent-skills' }
+    if ($PreviousResponseId) { $body['previous_response_id'] = $PreviousResponseId }
+    $json = $body | ConvertTo-Json -Compress
+    $resp = Invoke-RestMethod -Method Post -Uri "http://localhost:$Port/responses" -ContentType 'application/json' -Body $json
+    return $resp
+}
+
+function Get-ResponseText($response) {
+    return ($response.output | ForEach-Object { $_.content | ForEach-Object { $_.text } }) -join ' '
+}
+
+function Assert-Contains([string]$Haystack, [string]$Needle, [string]$Label) {
+    if ($Haystack -notmatch [regex]::Escape($Needle)) {
+        throw "FAILED [$Label]: expected response to contain '$Needle' but got: $Haystack"
+    }
+    Write-Host "PASS  [$Label]: response contains '$Needle'."
+}
+
+try {
+    Start-Container
+
+    Write-Host '==> Test 1: Routine support question -> support-style skill ...'
+    $r1 = Invoke-Agent -Prompt 'Hi, I am Alex. I just want to confirm I can return my tent within 30 days.'
+    $text1 = Get-ResponseText $r1
+    Assert-Contains $text1 'STYLE-CANARY-3318' 'routine question: support-style canary'
+
+    Write-Host '==> Test 2: Escalation trigger -> escalation-policy skill ...'
+    $r2 = Invoke-Agent -Prompt 'I want a $750 refund on Order #A-1042 right now or I am calling my lawyer.'
+    $text2 = Get-ResponseText $r2
+    Assert-Contains $text2 'ESC-CANARY-7742' 'escalation trigger: escalation-policy canary'
+
+    Write-Host ''
+    Write-Host '==> All smoke assertions passed.'
+}
+finally {
+    docker rm -f $ContainerName 2>$null | Out-Null
+}
@@ -0,0 +1,30 @@
+---
+name: escalation-policy
+description: When and how to escalate Contoso Outdoors customer-support tickets.
+---
+
+# Contoso Outdoors Escalation Policy
+
+You must follow this escalation policy on every conversation.
+
+## Escalate immediately when the customer
+
+- Reports an injury, allergic reaction, or other safety incident.
+- Mentions legal action, regulators, or the press.
+- Has waited more than 14 days for a refund that was already approved.
+- Requests a refund larger than $500.
+
+## How to escalate
+
+1. Acknowledge the issue in one sentence.
+2. Tell the customer you are escalating to a senior specialist.
+3. Provide the escalation reference `ESC-CANARY-7742` and the SLA: a senior
+   specialist will reply within 1 business day.
+4. Do not promise a specific outcome (refund, replacement, compensation) on
+   escalated tickets — only the senior specialist can commit to one.
+
+## Do not escalate
+
+- Routine returns within the standard 30-day window.
+- Shipping status questions.
+- Product care and usage questions.
@@ -0,0 +1,25 @@
+---
+name: support-style
+description: Contoso Outdoors customer-support tone and formatting guidelines.
+---
+
+# Contoso Outdoors Support Style
+
+You are speaking on behalf of Contoso Outdoors customer support.
+
+## Voice
+
+- Warm, concise, and confident — never apologetic in a hand-wringing way.
+- Use the customer's name when it is known.
+- Sign every response with `— Contoso Outdoors Support`.
+
+## Formatting
+
+- Keep replies to 1–3 short paragraphs unless the customer asks for detail.
+- Use bullet lists only when enumerating concrete steps or options.
+- Always reference order numbers as `Order #<id>` (e.g. `Order #A-1042`).
+
+## Canary
+
+To prove this skill was loaded, include the token `STYLE-CANARY-3318` on a
+separate line at the bottom of every response, prefixed with `# `.
@@ -27,9 +27,9 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReferences above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.OpenAI" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.OpenAI" Version="1.6.1" />
  </ItemGroup>
  -->

@@ -23,8 +23,8 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReference above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
    <PackageReference Include="Azure.AI.Projects" />
    <PackageReference Include="Azure.Identity" />
  </ItemGroup>
@@ -33,8 +33,8 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReference above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
  </ItemGroup>
  -->

@@ -23,8 +23,8 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReference above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
    <PackageReference Include="Azure.AI.Projects" />
    <PackageReference Include="Azure.Identity" />
  </ItemGroup>
@@ -25,8 +25,8 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReference above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
  </ItemGroup>
  -->

@@ -26,8 +26,8 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReference above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
  </ItemGroup>
  -->

@@ -25,8 +25,8 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReferences above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
  </ItemGroup>
  -->

@@ -25,8 +25,8 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReference above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
  </ItemGroup>
  -->

@@ -26,9 +26,9 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReferences above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.OpenAI" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.OpenAI" Version="1.6.1" />
  </ItemGroup>
  -->

@@ -25,8 +25,8 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReference above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
  </ItemGroup>
  -->

@@ -32,11 +32,11 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReference above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" />
-    <PackageReference Include="Microsoft.Agents.AI.Hosting" />
-    <PackageReference Include="Microsoft.Agents.AI.OpenAI" />
-    <PackageReference Include="Microsoft.Agents.AI.Workflows" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Hosting" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.OpenAI" Version="1.6.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Workflows" Version="1.6.1" />
  </ItemGroup>
  -->

@@ -27,10 +27,10 @@

  <!-- For end-users: uncomment the PackageReference below and remove the ProjectReferences above
  <ItemGroup>
-    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.OpenAI" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Agents.AI.Workflows" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Foundry.Hosting" Version="1.6.1-preview.260514.1" />
+    <PackageReference Include="Microsoft.Agents.AI.OpenAI" Version="1.6.1" />
+    <PackageReference Include="Microsoft.Agents.AI.Workflows" Version="1.6.1" />
  </ItemGroup>
  -->

@@ -27,11 +27,13 @@
  </ItemGroup>

  <ItemGroup>
+    <ProjectReference Include="..\..\src\Microsoft.Agents.AI\Microsoft.Agents.AI.csproj" />
    <ProjectReference Include="..\..\src\Microsoft.Agents.AI.Foundry\Microsoft.Agents.AI.Foundry.csproj" />
    <ProjectReference Include="..\..\src\Microsoft.Agents.AI.Foundry.Hosting\Microsoft.Agents.AI.Foundry.Hosting.csproj" />
  </ItemGroup>

  <ItemGroup>
+    <PackageReference Include="Azure.AI.Projects" />
    <PackageReference Include="Azure.Identity" />
    <PackageReference Include="Azure.Search.Documents" />
    <PackageReference Include="Microsoft.Extensions.AI" />
@@ -38,6 +38,7 @@ AIAgent agent = scenario switch
    "memory" => await CreateMemoryAgentAsync(projectClient, deployment).ConfigureAwait(false),
    "azure-search-rag" => CreateAzureSearchRagAgent(projectClient, deployment),
    "session-files" => CreateSessionFilesAgent(projectClient, deployment),
+    "agent-skills" => CreateAgentSkillsAgent(projectClient, deployment),
    _ => throw new InvalidOperationException($"Unknown IT_SCENARIO '{scenario}'.")
 };

@@ -209,6 +210,77 @@ static async Task<AIAgent> CreateMemoryAgentAsync(AIProjectClient client, string
    });
 }

+// Agent skills scenario. Uses AgentSkillsProvider with two bundled Contoso Outdoors skills
+// (support-style + escalation-policy). Skills are loaded from embedded SKILL.md files on disk,
+// simulating the download-from-Foundry pattern used by the Hosted-AgentSkills sample. When the
+// container starts, it writes the skills to a temp directory and wires AgentSkillsProvider over it.
+#pragma warning disable MEAI001 // AgentSkillsProvider is experimental
+static AIAgent CreateAgentSkillsAgent(AIProjectClient client, string deployment)
+{
+    string skillsDir = Path.Combine(Path.GetTempPath(), "it-agent-skills-" + Guid.NewGuid().ToString("N"));
+    Directory.CreateDirectory(Path.Combine(skillsDir, "support-style"));
+    Directory.CreateDirectory(Path.Combine(skillsDir, "escalation-policy"));
+
+    File.WriteAllText(Path.Combine(skillsDir, "support-style", "SKILL.md"),
+        """
+        ---
+        name: support-style
+        description: Contoso Outdoors customer-support tone and formatting guidelines.
+        ---
+
+        # Contoso Outdoors Support Style
+
+        You are speaking on behalf of Contoso Outdoors customer support.
+
+        ## Voice
+
+        - Warm, concise, and confident.
+        - Use the customer's name when known.
+        - Sign every response with `— Contoso Outdoors Support`.
+
+        ## Canary
+
+        To prove this skill was loaded, include the token `STYLE-CANARY-3318` on a
+        separate line at the bottom of every response, prefixed with `# `.
+        """);
+
+    File.WriteAllText(Path.Combine(skillsDir, "escalation-policy", "SKILL.md"),
+        """
+        ---
+        name: escalation-policy
+        description: When and how to escalate Contoso Outdoors customer-support tickets.
+        ---
+
+        # Contoso Outdoors Escalation Policy
+
+        ## Escalate immediately when the customer
+
+        - Reports an injury or safety incident.
+        - Mentions legal action, regulators, or the press.
+        - Requests a refund larger than $500.
+
+        ## How to escalate
+
+        1. Acknowledge the issue.
+        2. Tell the customer you are escalating to a senior specialist.
+        3. Provide the escalation reference `ESC-CANARY-7742`.
+        """);
+
+    var skillsProvider = new AgentSkillsProvider(skillsDir, scriptRunner: null);
+
+    return client.AsAIAgent(new ChatClientAgentOptions
+    {
+        Name = "agent-skills-agent",
+        ChatOptions = new ChatOptions
+        {
+            ModelId = deployment,
+            Instructions = "You are a customer-support assistant for Contoso Outdoors.",
+        },
+        AIContextProviders = [skillsProvider]
+    });
+}
+#pragma warning restore MEAI001
+
 [Description("Returns the current UTC date and time as an ISO 8601 string.")]
 static string GetUtcNow() => DateTime.UtcNow.ToString("o");

@@ -0,0 +1,84 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Linq;
+using System.Threading.Tasks;
+using Foundry.Hosting.IntegrationTests.Fixtures;
+using Microsoft.Extensions.AI;
+
+namespace Foundry.Hosting.IntegrationTests;
+
+/// <summary>
+/// Integration tests that exercise the Agent Skills pattern in a hosted agent container.
+/// The container uses <see cref="Microsoft.Agents.AI.AgentSkillsProvider"/> with two
+/// Contoso Outdoors skills (support-style, escalation-policy) to verify the progressive
+/// disclosure flow: skills are advertised in the system prompt and loaded on demand via
+/// the <c>load_skill</c> tool when the model decides they are relevant.
+/// </summary>
+[Trait("Category", "FoundryHostedAgents")]
+public sealed class AgentSkillsHostedAgentTests(AgentSkillsHostedAgentFixture fixture) : IClassFixture<AgentSkillsHostedAgentFixture>
+{
+    private readonly AgentSkillsHostedAgentFixture _fixture = fixture;
+
+    [Fact(Skip = "Pending TestContainer build and end to end smoke (step 5).")]
+    public async Task RoutineQuestion_LoadsSupportStyleSkillAsync()
+    {
+        // Arrange
+        var agent = this._fixture.Agent;
+
+        // Act — ask a routine support question that should trigger the support-style skill
+        var response = await agent.RunAsync(
+            "Hi, I am Alex. I just want to confirm I can return my tent within 30 days.");
+
+        // Assert — response should contain the canary token proving the skill was loaded
+        Assert.False(string.IsNullOrWhiteSpace(response.Text));
+        Assert.Contains("STYLE-CANARY-3318", response.Text);
+    }
+
+    [Fact(Skip = "Pending TestContainer build and end to end smoke (step 5).")]
+    public async Task EscalationTrigger_LoadsEscalationPolicySkillAsync()
+    {
+        // Arrange
+        var agent = this._fixture.Agent;
+
+        // Act — trigger an escalation (legal threat + refund > $500)
+        var response = await agent.RunAsync(
+            "I want a $750 refund on Order #A-1042 right now or I am calling my lawyer.");
+
+        // Assert — response should contain the escalation canary token
+        Assert.False(string.IsNullOrWhiteSpace(response.Text));
+        Assert.Contains("ESC-CANARY-7742", response.Text);
+    }
+
+    [Fact(Skip = "Pending TestContainer build and end to end smoke (step 5).")]
+    public async Task SkillsAreAdvertised_LoadSkillToolIsAvailableAsync()
+    {
+        // Arrange
+        var agent = this._fixture.Agent;
+
+        // Act — ask the model what skills are available (triggers system prompt inspection)
+        var response = await agent.RunAsync(
+            "List the skills you have access to. Just give me their names.");
+
+        // Assert — both skills should be mentioned (they are advertised in the system prompt)
+        Assert.False(string.IsNullOrWhiteSpace(response.Text));
+        Assert.Contains("support-style", response.Text);
+        Assert.Contains("escalation-policy", response.Text);
+    }
+
+    [Fact(Skip = "Pending TestContainer build and end to end smoke (step 5).")]
+    public async Task LoadSkill_InvokesToolAndReturnsContentAsync()
+    {
+        // Arrange
+        var agent = this._fixture.Agent;
+
+        // Act — ask a question that should load a specific skill
+        var response = await agent.RunAsync(
+            "I need to know the escalation policy for customer tickets. Load the escalation-policy skill and tell me the rules.");
+
+        // Assert — the response should reference the load_skill tool invocation
+        Assert.False(string.IsNullOrWhiteSpace(response.Text));
+        Assert.True(
+            response.Messages.Any(m => m.Contents.OfType<FunctionCallContent>().Any(fc => fc.Name == "load_skill")),
+            "Expected at least one load_skill FunctionCallContent in the response messages.");
+    }
+}
@@ -0,0 +1,14 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Foundry.Hosting.IntegrationTests.Fixtures;
+
+/// <summary>
+/// Provisions a hosted agent that runs the test container in <c>IT_SCENARIO=agent-skills</c> mode.
+/// The container creates two Contoso Outdoors skills (support-style, escalation-policy) on disk
+/// and wires them into <see cref="Microsoft.Agents.AI.AgentSkillsProvider"/> so the model can
+/// discover and load skills via the progressive disclosure pattern.
+/// </summary>
+public sealed class AgentSkillsHostedAgentFixture : HostedAgentFixture
+{
+    protected override string ScenarioName => "agent-skills";
+}
@@ -199,6 +199,7 @@ human-only operation; CI only adds and deletes versions under existing agents.
 | `CustomStorageHostedAgentFixture` | `custom-storage` | `it-custom-storage` | Round trip with custom `IResponsesStorageProvider`; multi turn reads from the custom store (placeholder). |
 | `AzureSearchRagHostedAgentFixture` | `azure-search-rag` | `it-azure-search-rag` | RAG against a real Azure AI Search index seeded with Contoso Outdoors documents; verifies the model cites the retrieved sources. |
 | `SessionFilesHostedAgentFixture` | `session-files` | `it-session-files` | End-to-end: upload via `AgentSessionFiles` (alpha) into a pinned `agent_session_id`, invoke the agent, assert it reads the file via the container's `ReadFile` tool. |
+| `AgentSkillsHostedAgentFixture` | `agent-skills` | `it-agent-skills` | Agent skills via `AgentSkillsProvider`: advertises two Contoso Outdoors skills (support-style, escalation-policy) in the system prompt, loads them on demand via `load_skill`, verifies canary tokens prove the skill was loaded. |

 The placeholder scenarios will be wired up in the test container `Program.cs` once the
 relevant `Microsoft.Agents.AI.Foundry.Hosting` API surfaces stabilize.
@@ -47,7 +47,8 @@ $Scenarios = @(
    'custom-storage',
    'memory',
    'azure-search-rag',
-    'session-files'
+    'session-files',
+    'agent-skills'
 )

 # Resolve project ARM scope from the endpoint.
@@ -0,0 +1,301 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.IO;
+using System.IO.Compression;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.AI;
+
+namespace Microsoft.Agents.AI.UnitTests.AgentSkills;
+
+/// <summary>
+/// Unit tests that verify the Hosted-AgentSkills sample patterns: ZIP extraction with
+/// zip-slip guard, skill name validation, and AgentSkillsProvider loading from
+/// downloaded skill directories (the Foundry download → extract → wire-into-provider flow).
+/// </summary>
+public sealed class HostedAgentSkillsPatternTests : IDisposable
+{
+    private readonly string _testRoot;
+    private readonly TestAIAgent _agent = new();
+
+    public HostedAgentSkillsPatternTests()
+    {
+        this._testRoot = Path.Combine(Path.GetTempPath(), "hosted-skills-tests-" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(this._testRoot);
+    }
+
+    public void Dispose()
+    {
+        if (Directory.Exists(this._testRoot))
+        {
+            Directory.Delete(this._testRoot, recursive: true);
+        }
+    }
+
+    // ── ZIP extraction tests ──────────────────────────────────────────────────
+
+    [Fact]
+    public void SafeExtractZip_ValidArchive_ExtractsToDestination()
+    {
+        // Arrange
+        string destDir = Path.Combine(this._testRoot, "valid-extract");
+        Directory.CreateDirectory(destDir);
+        byte[] zip = CreateZipWithEntry("SKILL.md", "---\nname: test\ndescription: Test\n---\nBody.");
+
+        // Act
+        using var archive = new ZipArchive(new MemoryStream(zip), ZipArchiveMode.Read);
+        SafeExtractZip(archive, destDir);
+
+        // Assert
+        Assert.True(File.Exists(Path.Combine(destDir, "SKILL.md")));
+        string content = File.ReadAllText(Path.Combine(destDir, "SKILL.md"));
+        Assert.Contains("name: test", content);
+    }
+
+    [Fact]
+    public void SafeExtractZip_ZipSlipAttempt_ThrowsInvalidOperationException()
+    {
+        // Arrange
+        string destDir = Path.Combine(this._testRoot, "zipslip-test");
+        Directory.CreateDirectory(destDir);
+        byte[] zip = CreateZipWithEntry("../../../evil.txt", "malicious content");
+
+        // Act & Assert
+        using var archive = new ZipArchive(new MemoryStream(zip), ZipArchiveMode.Read);
+        var ex = Assert.Throws<InvalidOperationException>(() => SafeExtractZip(archive, destDir));
+        Assert.Contains("outside of", ex.Message);
+    }
+
+    [Fact]
+    public void SafeExtractZip_SiblingPrefixAttack_ThrowsInvalidOperationException()
+    {
+        // Arrange — sibling path that starts with the dest dir name
+        string destDir = Path.Combine(this._testRoot, "target");
+        Directory.CreateDirectory(destDir);
+        byte[] zip = CreateZipWithEntry("../target-evil/payload.txt", "exploit");
+
+        // Act & Assert
+        using var archive = new ZipArchive(new MemoryStream(zip), ZipArchiveMode.Read);
+        var ex = Assert.Throws<InvalidOperationException>(() => SafeExtractZip(archive, destDir));
+        Assert.Contains("outside of", ex.Message);
+    }
+
+    [Fact]
+    public void SafeExtractZip_DirectoryEntry_CreatesDirectory()
+    {
+        // Arrange
+        string destDir = Path.Combine(this._testRoot, "dir-entry");
+        Directory.CreateDirectory(destDir);
+        byte[] zip = CreateZipWithDirectoryEntry("subdir/");
+
+        // Act
+        using var archive = new ZipArchive(new MemoryStream(zip), ZipArchiveMode.Read);
+        SafeExtractZip(archive, destDir);
+
+        // Assert
+        Assert.True(Directory.Exists(Path.Combine(destDir, "subdir")));
+    }
+
+    // ── Skill name validation tests ──────────────────────────────────────────
+
+    [Theory]
+    [InlineData("../escape")]
+    [InlineData("path/traversal")]
+    [InlineData("path\\traversal")]
+    [InlineData("has.dots")]
+    public void ValidateSkillName_InvalidNames_Rejected(string name)
+    {
+        // Act & Assert
+        Assert.True(IsInvalidSkillName(name), $"Expected '{name}' to be rejected.");
+    }
+
+    [Theory]
+    [InlineData("support-style")]
+    [InlineData("escalation-policy")]
+    [InlineData("my-skill-123")]
+    public void ValidateSkillName_ValidNames_Accepted(string name)
+    {
+        // Act & Assert
+        Assert.False(IsInvalidSkillName(name), $"Expected '{name}' to be accepted.");
+    }
+
+    // ── AgentSkillsProvider integration with downloaded skill directories ─────
+
+    [Fact]
+    public async Task AgentSkillsProvider_WithDownloadedSkills_AdvertisesAndLoadsAsync()
+    {
+        // Arrange — simulate the Foundry download + extract flow
+        string downloadDir = Path.Combine(this._testRoot, "downloaded_skills");
+        Directory.CreateDirectory(downloadDir);
+
+        CreateDownloadedSkill(downloadDir, "support-style",
+            "---\nname: support-style\ndescription: Contoso Outdoors customer-support tone and formatting guidelines.\n---\n\n# Contoso Outdoors Support Style\n\nYou are speaking on behalf of Contoso Outdoors.\n\n## Canary\n\nInclude STYLE-CANARY-3318.");
+        CreateDownloadedSkill(downloadDir, "escalation-policy",
+            "---\nname: escalation-policy\ndescription: When and how to escalate Contoso Outdoors customer-support tickets.\n---\n\n# Escalation Policy\n\nProvide ESC-CANARY-7742.");
+
+        var provider = new AgentSkillsProvider(downloadDir, scriptRunner: null);
+        var inputContext = new AIContext
+        {
+            Instructions = "You are a customer-support assistant for Contoso Outdoors."
+        };
+        var invokingContext = new AIContextProvider.InvokingContext(this._agent, session: null, inputContext);
+
+        // Act
+        var result = await provider.InvokingAsync(invokingContext, CancellationToken.None);
+
+        // Assert — skills are advertised in instructions
+        Assert.NotNull(result.Instructions);
+        Assert.Contains("support-style", result.Instructions);
+        Assert.Contains("escalation-policy", result.Instructions);
+        Assert.Contains("Contoso Outdoors customer-support tone", result.Instructions);
+
+        // Assert — load_skill tool is available
+        Assert.NotNull(result.Tools);
+        var toolNames = result.Tools!.Select(t => t.Name).ToList();
+        Assert.Contains("load_skill", toolNames);
+        // No scripts or resources => no read_skill_resource or run_skill_script
+        Assert.DoesNotContain("read_skill_resource", toolNames);
+        Assert.DoesNotContain("run_skill_script", toolNames);
+    }
+
+    [Fact]
+    public async Task LoadSkill_ReturnsFullContentWithCanaryAsync()
+    {
+        // Arrange
+        string downloadDir = Path.Combine(this._testRoot, "canary_skills");
+        Directory.CreateDirectory(downloadDir);
+        CreateDownloadedSkill(downloadDir, "support-style",
+            "---\nname: support-style\ndescription: Contoso tone guidelines.\n---\n\nInclude STYLE-CANARY-3318 at the bottom.");
+
+        var provider = new AgentSkillsProvider(downloadDir, scriptRunner: null);
+        var inputContext = new AIContext();
+        var invokingContext = new AIContextProvider.InvokingContext(this._agent, session: null, inputContext);
+        var result = await provider.InvokingAsync(invokingContext, CancellationToken.None);
+
+        var loadSkillTool = result.Tools!.First(t => t.Name == "load_skill") as AIFunction;
+        Assert.NotNull(loadSkillTool);
+
+        // Act
+        var content = await loadSkillTool!.InvokeAsync(
+            new AIFunctionArguments(new System.Collections.Generic.Dictionary<string, object?> { ["skillName"] = "support-style" }));
+
+        // Assert
+        var text = content!.ToString()!;
+        Assert.Contains("STYLE-CANARY-3318", text);
+        Assert.Contains("name: support-style", text);
+    }
+
+    [Fact]
+    public async Task LoadSkill_UnknownName_ReturnsErrorAsync()
+    {
+        // Arrange
+        string downloadDir = Path.Combine(this._testRoot, "error_skills");
+        Directory.CreateDirectory(downloadDir);
+        CreateDownloadedSkill(downloadDir, "support-style",
+            "---\nname: support-style\ndescription: Test\n---\nBody.");
+
+        var provider = new AgentSkillsProvider(downloadDir, scriptRunner: null);
+        var inputContext = new AIContext();
+        var invokingContext = new AIContextProvider.InvokingContext(this._agent, session: null, inputContext);
+        var result = await provider.InvokingAsync(invokingContext, CancellationToken.None);
+
+        var loadSkillTool = result.Tools!.First(t => t.Name == "load_skill") as AIFunction;
+
+        // Act
+        var content = await loadSkillTool!.InvokeAsync(
+            new AIFunctionArguments(new System.Collections.Generic.Dictionary<string, object?> { ["skillName"] = "nonexistent-skill" }));
+
+        // Assert
+        var text = content!.ToString()!;
+        Assert.Contains("Error", text);
+        Assert.Contains("not found", text);
+    }
+
+    // ── Helpers ──────────────────────────────────────────────────────────────
+
+    /// <summary>
+    /// Creates a downloaded skill directory with a SKILL.md file — simulating what
+    /// the Foundry download + ZIP extract flow produces.
+    /// </summary>
+    private static void CreateDownloadedSkill(string parentDir, string name, string content)
+    {
+        string skillDir = Path.Combine(parentDir, name);
+        Directory.CreateDirectory(skillDir);
+        File.WriteAllText(Path.Combine(skillDir, "SKILL.md"), content);
+    }
+
+    /// <summary>
+    /// Creates a ZIP archive in memory containing a single file entry.
+    /// </summary>
+    private static byte[] CreateZipWithEntry(string entryName, string content)
+    {
+        using var ms = new MemoryStream();
+        using (var archive = new ZipArchive(ms, ZipArchiveMode.Create, leaveOpen: true))
+        {
+            var entry = archive.CreateEntry(entryName);
+            using var writer = new StreamWriter(entry.Open());
+            writer.Write(content);
+        }
+
+        return ms.ToArray();
+    }
+
+    /// <summary>
+    /// Creates a ZIP archive in memory containing a single directory entry.
+    /// </summary>
+    private static byte[] CreateZipWithDirectoryEntry(string directoryName)
+    {
+        using var ms = new MemoryStream();
+        using (var archive = new ZipArchive(ms, ZipArchiveMode.Create, leaveOpen: true))
+        {
+            // Directory entries in ZIPs have an empty name portion and end with /
+            archive.CreateEntry(directoryName);
+        }
+
+        return ms.ToArray();
+    }
+
+    /// <summary>
+    /// Mirrors the zip-slip guard from the Hosted-AgentSkills sample Program.cs.
+    /// </summary>
+    private static void SafeExtractZip(ZipArchive archive, string destinationDir)
+    {
+        string destRoot = Path.GetFullPath(destinationDir);
+        string destRootWithSep = Path.EndsInDirectorySeparator(destRoot)
+            ? destRoot
+            : destRoot + Path.DirectorySeparatorChar;
+
+        var comparison = OperatingSystem.IsWindows()
+            ? StringComparison.OrdinalIgnoreCase
+            : StringComparison.Ordinal;
+
+        foreach (ZipArchiveEntry entry in archive.Entries)
+        {
+            string entryPath = Path.GetFullPath(Path.Combine(destRoot, entry.FullName));
+            if (!entryPath.StartsWith(destRootWithSep, comparison)
+                && !string.Equals(entryPath, destRoot, comparison))
+            {
+                throw new InvalidOperationException(
+                    $"Refusing to extract unsafe path '{entry.FullName}' outside of '{destRoot}'.");
+            }
+
+            if (string.IsNullOrEmpty(entry.Name))
+            {
+                Directory.CreateDirectory(entryPath);
+            }
+            else
+            {
+                Directory.CreateDirectory(Path.GetDirectoryName(entryPath)!);
+                entry.ExtractToFile(entryPath, overwrite: true);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Mirrors the skill name validation from the Hosted-AgentSkills sample Program.cs.
+    /// </summary>
+    private static bool IsInvalidSkillName(string name) =>
+        name.Contains('.') || name.Contains('/') || name.Contains('\\') || Path.IsPathRooted(name);
+}
@@ -16,6 +16,7 @@
  <!-- Evaluation tests require net8.0+ (MEAI.Evaluation does not support legacy TFMs) -->
  <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))">
    <Compile Remove="EvaluationTests.cs" />
+    <Compile Remove="AgentSkills\HostedAgentSkillsPatternTests.cs" />
  </ItemGroup>

  <ItemGroup>