Playa/hosts/Volcanic.AgenticCore.Telegram/Program.cs

// Telegram front end for the agent: long polling, one agent session per private chat, Claude Code as the model.
//
//   TELEGRAM_BOT_TOKEN=123:abc TELEGRAM_ALLOWED_USER_IDS=111111 dotnet run --project hosts/Volcanic.AgenticCore.Telegram

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Telegram.Bot;
using Volcanic.AgenticCore.Extensions.ClaudeCode;
using Volcanic.AgenticCore.Extensions.Mcp;
using Volcanic.AgenticCore.Features.Processes;
using Volcanic.AgenticCore.Hosting;
using Volcanic.AgenticCore.Telegram;
using Volcanic.AgenticCore.Telegram.Chats;
using Volcanic.AgenticCore.Telegram.Inbound;
using Volcanic.AgenticCore.Telegram.Polling;
using Volcanic.AgenticCore.Telegram.Rendering;
using Volcanic.AgenticCore.Telegram.Speech;

var builder = Host.CreateApplicationBuilder(args);

var options = builder.Configuration.GetSection(TelegramOptions.SectionName).Get<TelegramOptions>() ?? new TelegramOptions();
options.ApplyEnvironment(Environment.GetEnvironmentVariable);
var processSection = builder.Configuration.GetSection(ProcessEnvironmentSection.SectionName).Get<ProcessEnvironmentSection>() ?? new ProcessEnvironmentSection();
var calendar = GoogleCalendarSetup.Options(
    builder.Configuration.GetSection(GoogleCalendarSection.SectionName).Get<GoogleCalendarSection>() ?? new GoogleCalendarSection(),
    Environment.GetEnvironmentVariable);
var processEnvironment = new ProcessEnvironmentOptions();
TelegramProcessEnvironment.Configure(processEnvironment, options, processSection, Environment.GetEnvironmentVariable, calendar);
var mcp = builder.Configuration.GetSection(McpOptions.SectionName).Get<McpOptions>() ?? new McpOptions();
mcp.ApplyEnvironment(Environment.GetEnvironmentVariable);
var errors = options.Validate().Concat(processEnvironment.Validate()).Concat(mcp.Validate()).ToList();
if (errors.Count > 0)
{
    foreach (var error in errors) Console.Error.WriteLine(error);
    return 2;
}

builder.Services.AddSingleton(options);
builder.Services.AddSingleton(mcp);
builder.Services.AddSingleton(options.Speech);
if (options.Speech.IsEnabled) // no key, no ISpeechToText: voice notes get the setup notice
    builder.Services.AddHttpClient<ISpeechToText, OpenAiSpeechToText>(client => client.Timeout = TimeSpan.FromMinutes(2));
if (calendar is not null) builder.Services.AddSingleton(calendar); // ChatRegistry and BotSetupService take it optionally
builder.Services.AddSingleton<OwnerLoginChannel>();
// The extension is constructed per session through ActivatorUtilities, which injects this. LoginUi resolves
// OwnerLoginChannel lazily (at call time, not here) to avoid a construction cycle: ChatRegistry depends on the
// session factory, which depends on the extension, which would otherwise depend back on ChatRegistry.
builder.Services.AddSingleton(sp => new ClaudeCodeProviderOptions
{
    LoginUi = ct => sp.GetRequiredService<OwnerLoginChannel>().ResolveAsync(ct),
});
builder.Services.AddAgenticCore(o =>
{
    o.DefaultModel = options.Model;
    o.ProcessEnvironment = processEnvironment;
    o.AddExtension<ClaudeCodeProviderExtension>();
    o.AddExtension<McpExtension>();
});
builder.Services.AddSingleton<ITelegramBotClient>(_ => new TelegramBotClient(options.BotToken));
builder.Services.AddSingleton(new ReconnectPolicy(options.ReconnectInitialDelay, options.ReconnectMaxDelay));
builder.Services.AddSingleton<TelegramSender>();
builder.Services.TryAddSingleton(TimeProvider.System);
builder.Services.AddSingleton<ChatRegistry>();
builder.Services.AddSingleton<ChatCommands>();
builder.Services.AddSingleton<InboundMedia>();
builder.Services.AddSingleton<InboundComposer>();
builder.Services.AddSingleton<IUpdateRouter, UpdateRouter>();
builder.Services.AddSingleton<PollingService>();
builder.Services.AddHostedService(sp => sp.GetRequiredService<PollingService>());
builder.Services.AddHostedService<BotSetupService>();

using var host = builder.Build();

var logger = host.Services.GetRequiredService<ILoggerFactory>().CreateLogger("Volcanic.AgenticCore.Telegram");
// Before polling and the first claude process; the spawn policy's own call later is a no-op.
HostProcessHardening.Apply(processEnvironment, logger);
logger.LogInformation("{ProcessEnvironment}", TelegramProcessEnvironment.Describe(processEnvironment));
logger.LogInformation("{Mcp}", mcp.DescribePlaywright());
logger.LogInformation("{Speech}", options.Speech.Describe());
if (ClaudeInstallation.Locate(Environment.GetEnvironmentVariable) is { } claude)
    logger.LogInformation("Using Claude Code at {Path}, model {Model}", claude, options.Model);
else
    logger.LogWarning("Claude Code (claude) was not found on PATH; requests will fail until it is installed and logged in. Send /claude-code-doctor to the bot for details.");
logger.LogInformation("Allowed users: {Users}. Workspaces under {Root}", string.Join(", ", options.AllowedUserIds), options.WorkspaceRoot);

var polling = host.Services.GetRequiredService<PollingService>();
await host.RunAsync(); // disposes the host
return polling.FatalError is null ? 0 : 1;