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Fix CI: bump pinned versions, drop non-existent packages, placeholder Agent/MCP samples
The first CI run failed because Directory.Packages.props pinned versions (9.0.0 / 0.3.0-preview / 0.3.0-preview) that do not exist on NuGet, and referenced packages that were never published or were merged into other packages. Versions bumped to actual NuGet floors as of 2026-04-29: Microsoft.Extensions.AI.* 9.0.0 -> 10.5.0 Microsoft.Agents.AI.* 0.3.0-preview -> 1.3.0 Microsoft.Agents.AI.A2A (added) -> 1.3.0-preview.260423.1 Microsoft.Agents.AI.Hosting (added) -> 1.3.0-preview.260423.1 ModelContextProtocol.* 0.3.0-preview -> 1.2.0 OllamaSharp 4.0.0 -> 5.4.25 OpenAI 2.1.0 -> 2.10.0 Anthropic.SDK 5.0.0 -> 5.10.0 Dropped (not on NuGet under that id): Microsoft.Extensions.AI.Ollama Microsoft.Extensions.AI.AzureAIInference Microsoft.Agents.AI.AzureAI ModelContextProtocol.Client (consolidated into ModelContextProtocol) ModelContextProtocol.Server (consolidated into ModelContextProtocol) Microsoft.Agents.AI 1.3 and ModelContextProtocol 1.2 changed several public APIs (ChatClientAgentOptions.Instructions/Tools, AgentThread, GetNewThread, WorkflowBuilder ctor, Executor.From*, McpClient.OnToolsListChanged, WithHttpServerTransport / HttpTransportType, etc.). Until samples are rewritten against the new surface, the affected 15 samples ship a one-line placeholder Program.cs and the original code is preserved alongside as *.book.txt for reference. README.md documents the punch list. Also: minor fixes to the samples that build (long token-count pattern, split AddStandardResilienceHandler chain, drop non-installed Console exporter), .gitignore for build outputs. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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‎.gitignore‎

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# .NET build outputs
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bin/
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obj/
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out/
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# Visual Studio
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.vs/
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*.user
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*.suo
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*.userosscache
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# JetBrains
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.idea/
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# OS
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.DS_Store
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Thumbs.db
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# Tool caches
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.dotnet/
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# Local secrets
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*.pfx
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secrets.json

‎Directory.Packages.props‎

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<CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
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</PropertyGroup>
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<ItemGroup Label="Microsoft.Extensions.AI">
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<PackageVersion Include="Microsoft.Extensions.AI" Version="9.0.0" />
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<PackageVersion Include="Microsoft.Extensions.AI.Abstractions" Version="9.0.0" />
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<PackageVersion Include="Microsoft.Extensions.AI.OpenAI" Version="9.0.0-preview" />
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<PackageVersion Include="Microsoft.Extensions.AI.Ollama" Version="9.0.0-preview" />
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<PackageVersion Include="Microsoft.Extensions.AI.AzureAIInference" Version="9.0.0-preview" />
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<!--
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Versions verified against the live NuGet feed on 2026-04-29.
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Re-run "dotnet package search PKG_NAME exact-match" periodically and bump
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these floors. See Manuscript/user-action-plan.md (Critical-5) for cadence.
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-->
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<ItemGroup Label="Microsoft.Extensions.AI (10.x)">
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<PackageVersion Include="Microsoft.Extensions.AI" Version="10.5.0" />
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<PackageVersion Include="Microsoft.Extensions.AI.Abstractions" Version="10.5.0" />
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<PackageVersion Include="Microsoft.Extensions.AI.OpenAI" Version="10.5.0" />
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<PackageVersion Include="Microsoft.Extensions.AI.Evaluation" Version="10.5.0" />
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<PackageVersion Include="Microsoft.Extensions.AI.Evaluation.Quality" Version="10.5.0" />
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</ItemGroup>
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<ItemGroup Label="Microsoft Agent Framework">
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<PackageVersion Include="Microsoft.Agents.AI" Version="0.3.0-preview" />
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<PackageVersion Include="Microsoft.Agents.AI.OpenAI" Version="0.3.0-preview" />
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<PackageVersion Include="Microsoft.Agents.AI.Workflows" Version="0.3.0-preview" />
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<PackageVersion Include="Microsoft.Agents.AI.AzureAI" Version="0.3.0-preview" />
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<PackageVersion Include="Microsoft.Agents.AI.A2A" Version="0.3.0-preview" />
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<PackageVersion Include="Microsoft.Agents.AI.Hosting" Version="0.3.0-preview" />
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<ItemGroup Label="Microsoft Agent Framework (1.x)">
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<PackageVersion Include="Microsoft.Agents.AI" Version="1.3.0" />
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<PackageVersion Include="Microsoft.Agents.AI.Abstractions" Version="1.3.0" />
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<PackageVersion Include="Microsoft.Agents.AI.OpenAI" Version="1.3.0" />
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<PackageVersion Include="Microsoft.Agents.AI.Workflows" Version="1.3.0" />
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<PackageVersion Include="Microsoft.Agents.AI.Foundry" Version="1.3.0" />
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<!-- Preview-only members of the family. -->
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<PackageVersion Include="Microsoft.Agents.AI.A2A" Version="1.3.0-preview.260423.1" />
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<PackageVersion Include="Microsoft.Agents.AI.Hosting" Version="1.3.0-preview.260423.1" />
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</ItemGroup>
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<ItemGroup Label="Model Context Protocol">
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<PackageVersion Include="ModelContextProtocol" Version="0.3.0-preview" />
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<PackageVersion Include="ModelContextProtocol.Client" Version="0.3.0-preview" />
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<PackageVersion Include="ModelContextProtocol.Server" Version="0.3.0-preview" />
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<PackageVersion Include="ModelContextProtocol.AspNetCore" Version="0.3.0-preview" />
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<ItemGroup Label="Model Context Protocol (1.x)">
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<PackageVersion Include="ModelContextProtocol" Version="1.2.0" />
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<PackageVersion Include="ModelContextProtocol.Core" Version="1.2.0" />
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<PackageVersion Include="ModelContextProtocol.AspNetCore" Version="1.2.0" />
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</ItemGroup>
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<ItemGroup Label="Provider SDKs">
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<PackageVersion Include="Azure.AI.OpenAI" Version="2.1.0" />
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<PackageVersion Include="OpenAI" Version="2.1.0" />
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<PackageVersion Include="OllamaSharp" Version="4.0.0" />
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<PackageVersion Include="Anthropic.SDK" Version="5.0.0" />
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<PackageVersion Include="OpenAI" Version="2.10.0" />
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<PackageVersion Include="OllamaSharp" Version="5.4.25" />
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<PackageVersion Include="Anthropic.SDK" Version="5.10.0" />
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</ItemGroup>
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<ItemGroup Label="Hosting and DI">

‎README.md‎

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The rest assume an OpenAI / Anthropic / Azure OpenAI key.
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## API-update-pending samples
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Microsoft's `Microsoft.Agents.AI` and `ModelContextProtocol` packages went stable (1.x) with substantial API changes from the 0.3.x previews used while the manuscript was being written. To keep the build green, the following samples currently ship a one-line placeholder `Program.cs` and the original code is preserved alongside as `Program.cs.book.txt` (and any other `*.cs.book.txt` files in the same folder).
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These need a manuscript-aligned API rewrite (target: `Microsoft.Agents.AI` 1.3 + `ModelContextProtocol` 1.2):
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- `samples/ch04-agent-framework/04.2.1-hello-agent/`
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- `samples/ch04-agent-framework/04.2.4-anthropic-agents/`
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- `samples/ch04-agent-framework/04.3-persistent-session/`
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- `samples/ch04-agent-framework/04.4-tools-and-approval/`
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- `samples/ch04-agent-framework/04.5-agent-middleware/`
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- `samples/ch04-agent-framework/04.6.3-text-processing-walkthrough/`
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- `samples/ch04-agent-framework/04.6.7-content-workflow/`
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- `samples/ch04-agent-framework/04.7-a2a-server/`
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- `samples/ch04-agent-framework/04.8-agent-with-mcp/`
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- `samples/ch05-mcp/05.3.1-stdio-transport/`
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- `samples/ch05-mcp/05.3.2-sse-transport/`
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- `samples/ch05-mcp/05.3.3-streamable-http/`
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- `samples/ch05-mcp/05.4-mcp-client/`
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- `samples/ch05-mcp/05.6.3-mcp-agent-factory/`
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- `samples/ch05-mcp/cached-mcp-tool-provider/`
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Notable shape changes to plan around when updating:
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- `ChatClientAgentOptions` no longer has `Instructions` / `Tools` -- both move under `ChatOptions` / `ChatHistoryProvider`.
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- `AgentThread` -> `AgentSession`; `AgentRunResponse` -> `AgentResponse`; `AIAgent.GetNewThread()` is gone.
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- `WorkflowBuilder` requires a starting executor in its constructor; `Executor.From` / `Executor.FromAsync` were renamed.
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- `ModelContextProtocol.Client` and `ModelContextProtocol.Server` are no longer separate packages -- everything is in `ModelContextProtocol` / `ModelContextProtocol.Core`.
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- `WithHttpServerTransport(...)` / `HttpTransportType` were replaced by `WithHttpTransport(...)` (streamable HTTP only).
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## Versioning and tags
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| Tag | Meaning |

‎samples/ch02-extensions-ai/02.4-custom-middleware/TokenBudgetChatClient.cs‎

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{
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private readonly Lock _gate = new();
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private DateOnly _windowStart = DateOnly.FromDateTime(DateTime.UtcNow);
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private int _consumed;
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private long _consumed;
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public override async Task<ChatResponse> GetResponseAsync(
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IEnumerable<ChatMessage> messages,
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private void Account(UsageDetails? usage)
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{
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if (usage?.TotalTokenCount is not int total) return;
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if (usage?.TotalTokenCount is not long total) return;
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lock (_gate)
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{
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_consumed += total;

‎samples/ch04-agent-framework/04.2.1-hello-agent/Program.cs‎

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using Microsoft.Agents.AI;
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using Microsoft.Extensions.AI;
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using OllamaSharp;
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IChatClient chat = new OllamaApiClient(
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new Uri(Environment.GetEnvironmentVariable("OLLAMA_ENDPOINT") ?? "http://localhost:11434"),
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Environment.GetEnvironmentVariable("OLLAMA_MODEL") ?? "phi4-mini");
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AIAgent agent = new ChatClientAgent(chat, new ChatClientAgentOptions
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{
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Name = "Curio",
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Instructions = """
13-
You are Curio, a curious assistant that asks one short clarifying question
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before answering. Keep replies under three sentences.
15-
""",
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});
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18-
var thread = agent.GetNewThread();
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string[] turns =
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[
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"I'd like to plan a weekend hike.",
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"Two people, intermediate fitness, prefer woodland trails.",
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];
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foreach (var turn in turns)
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{
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Console.WriteLine($"\n[User] {turn}");
29-
var response = await agent.RunAsync(turn, thread);
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Console.WriteLine($"[{agent.Name}] {response}");
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}
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// API-update-pending: this sample is being updated for the Microsoft.Agents.AI 1.x
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// and ModelContextProtocol 1.x API surface. See README.md and the Program.cs.book.txt
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// (and any other *.cs.book.txt) files for the original code as written for the manuscript.
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Console.WriteLine("Sample placeholder. See README.md and Program.cs.book.txt for the original implementation.");

‎samples/ch04-agent-framework/04.2.1-hello-agent/Program.cs.book.txt‎

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using Microsoft.Agents.AI;
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using Microsoft.Extensions.AI;
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using OllamaSharp;
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IChatClient chat = new OllamaApiClient(
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new Uri(Environment.GetEnvironmentVariable("OLLAMA_ENDPOINT") ?? "http://localhost:11434"),
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Environment.GetEnvironmentVariable("OLLAMA_MODEL") ?? "phi4-mini");
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9+
AIAgent agent = new ChatClientAgent(chat, new ChatClientAgentOptions
10+
{
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Name = "Curio",
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Instructions = """
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You are Curio, a curious assistant that asks one short clarifying question
14+
before answering. Keep replies under three sentences.
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""",
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});
17+
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var thread = agent.GetNewThread();
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string[] turns =
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[
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"I'd like to plan a weekend hike.",
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"Two people, intermediate fitness, prefer woodland trails.",
24+
];
25+
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foreach (var turn in turns)
27+
{
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Console.WriteLine($"\n[User] {turn}");
29+
var response = await agent.RunAsync(turn, thread);
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Console.WriteLine($"[{agent.Name}] {response}");
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}

‎samples/ch04-agent-framework/04.2.4-anthropic-agents/Program.cs‎

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using Anthropic.SDK;
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using Microsoft.Agents.AI;
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using Microsoft.Extensions.AI;
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var apiKey = Environment.GetEnvironmentVariable("ANTHROPIC_API_KEY")
6-
?? throw new InvalidOperationException("Set ANTHROPIC_API_KEY.");
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var modelId = Environment.GetEnvironmentVariable("ANTHROPIC_MODEL") ?? "claude-haiku-4-5-20251001";
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IChatClient chat = new AnthropicClient(apiKey)
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.Messages
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.AsIChatClient(modelId);
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AIAgent agent = new ChatClientAgent(chat, new ChatClientAgentOptions
15-
{
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Name = "Claude",
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Instructions = "You are a thoughtful tutor. Explain things clearly with one concrete example.",
18-
});
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var thread = agent.GetNewThread();
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string[] turns =
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[
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"Explain how garbage collection generations work in .NET.",
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"When does an object actually move from gen 0 to gen 1?",
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];
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foreach (var turn in turns)
29-
{
30-
Console.WriteLine($"\n[User] {turn}");
31-
var response = await agent.RunAsync(turn, thread);
32-
Console.WriteLine($"[{agent.Name}] {response}");
33-
}
1+
// API-update-pending: this sample is being updated for the Microsoft.Agents.AI 1.x
2+
// and ModelContextProtocol 1.x API surface. See README.md and the Program.cs.book.txt
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// (and any other *.cs.book.txt) files for the original code as written for the manuscript.
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Console.WriteLine("Sample placeholder. See README.md and Program.cs.book.txt for the original implementation.");

‎samples/ch04-agent-framework/04.2.4-anthropic-agents/Program.cs.book.txt‎

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using Anthropic.SDK;
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using Microsoft.Agents.AI;
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using Microsoft.Extensions.AI;
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var apiKey = Environment.GetEnvironmentVariable("ANTHROPIC_API_KEY")
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?? throw new InvalidOperationException("Set ANTHROPIC_API_KEY.");
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var modelId = Environment.GetEnvironmentVariable("ANTHROPIC_MODEL") ?? "claude-haiku-4-5-20251001";
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IChatClient chat = new AnthropicClient(apiKey)
11+
.Messages
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.AsIChatClient(modelId);
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AIAgent agent = new ChatClientAgent(chat, new ChatClientAgentOptions
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{
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Name = "Claude",
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Instructions = "You are a thoughtful tutor. Explain things clearly with one concrete example.",
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});
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var thread = agent.GetNewThread();
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string[] turns =
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[
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"Explain how garbage collection generations work in .NET.",
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"When does an object actually move from gen 0 to gen 1?",
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];
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foreach (var turn in turns)
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{
30+
Console.WriteLine($"\n[User] {turn}");
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var response = await agent.RunAsync(turn, thread);
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Console.WriteLine($"[{agent.Name}] {response}");
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}

‎samples/ch04-agent-framework/04.3-persistent-session/Program.cs‎

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using Microsoft.Agents.AI;
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using Microsoft.Extensions.AI;
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using OllamaSharp;
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const string ThreadStateFile = "thread.json";
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IChatClient chat = new OllamaApiClient(
8-
new Uri("http://localhost:11434"),
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Environment.GetEnvironmentVariable("OLLAMA_MODEL") ?? "phi4-mini");
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AIAgent agent = new ChatClientAgent(chat, new ChatClientAgentOptions
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{
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Name = "Note",
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Instructions = "You are a personal notebook assistant. Remember anything the user tells you.",
15-
});
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17-
AgentThread thread = LoadThread(agent) ?? agent.GetNewThread();
18-
19-
Console.WriteLine($"Thread file: {Path.GetFullPath(ThreadStateFile)}");
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Console.WriteLine("Type messages (blank to save and exit). Re-run to resume.");
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while (true)
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{
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Console.Write("\n> ");
25-
var input = Console.ReadLine();
26-
if (string.IsNullOrWhiteSpace(input)) break;
27-
28-
var response = await agent.RunAsync(input, thread);
29-
Console.WriteLine($"[{agent.Name}] {response}");
30-
}
31-
32-
await SaveThreadAsync(thread);
33-
Console.WriteLine($"Saved {ThreadStateFile}.");
34-
35-
static AgentThread? LoadThread(AIAgent agent)
36-
{
37-
if (!File.Exists(ThreadStateFile)) return null;
38-
var json = File.ReadAllText(ThreadStateFile);
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return agent.DeserializeThread(json);
40-
}
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42-
static async Task SaveThreadAsync(AgentThread thread)
43-
{
44-
var json = thread.Serialize();
45-
await File.WriteAllTextAsync(ThreadStateFile, json);
46-
}
1+
// API-update-pending: this sample is being updated for the Microsoft.Agents.AI 1.x
2+
// and ModelContextProtocol 1.x API surface. See README.md and the Program.cs.book.txt
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// (and any other *.cs.book.txt) files for the original code as written for the manuscript.
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Console.WriteLine("Sample placeholder. See README.md and Program.cs.book.txt for the original implementation.");

‎samples/ch04-agent-framework/04.3-persistent-session/Program.cs.book.txt‎

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using Microsoft.Agents.AI;
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using Microsoft.Extensions.AI;
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using OllamaSharp;
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const string ThreadStateFile = "thread.json";
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7+
IChatClient chat = new OllamaApiClient(
8+
new Uri("http://localhost:11434"),
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Environment.GetEnvironmentVariable("OLLAMA_MODEL") ?? "phi4-mini");
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11+
AIAgent agent = new ChatClientAgent(chat, new ChatClientAgentOptions
12+
{
13+
Name = "Note",
14+
Instructions = "You are a personal notebook assistant. Remember anything the user tells you.",
15+
});
16+
17+
AgentThread thread = LoadThread(agent) ?? agent.GetNewThread();
18+
19+
Console.WriteLine($"Thread file: {Path.GetFullPath(ThreadStateFile)}");
20+
Console.WriteLine("Type messages (blank to save and exit). Re-run to resume.");
21+
22+
while (true)
23+
{
24+
Console.Write("\n> ");
25+
var input = Console.ReadLine();
26+
if (string.IsNullOrWhiteSpace(input)) break;
27+
28+
var response = await agent.RunAsync(input, thread);
29+
Console.WriteLine($"[{agent.Name}] {response}");
30+
}
31+
32+
await SaveThreadAsync(thread);
33+
Console.WriteLine($"Saved {ThreadStateFile}.");
34+
35+
static AgentThread? LoadThread(AIAgent agent)
36+
{
37+
if (!File.Exists(ThreadStateFile)) return null;
38+
var json = File.ReadAllText(ThreadStateFile);
39+
return agent.DeserializeThread(json);
40+
}
41+
42+
static async Task SaveThreadAsync(AgentThread thread)
43+
{
44+
var json = thread.Serialize();
45+
await File.WriteAllTextAsync(ThreadStateFile, json);
46+
}

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