rstropek/2026-01-27-copilot/dotnet-sse

Claude Code and agent skill by rstropek/2026-01-27-copilot

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This skill describes how to implement the server part of Server-Sent Events (SSE) in modern .NET (ASP.NET Core). Use this skill when the user asks about "SSE in .NET / ASP.NET Core".

Install

npx vskill@latest install rstropek/2026-01-27-copilot/dotnet-sse

SKILL.md

ASP.NET Core Minimal APIs have built-in SSE result support in ASP.NET Core 10 via Results.ServerSentEvents(...) / TypedResults.ServerSentEvents(...) returning a ServerSentEventsResult<T> from an IAsyncEnumerable.

Minimal API example (strings)

cs
app.MapGet("/events", () =>
{
    async IAsyncEnumerable<string> Stream([System.Runtime.CompilerServices.EnumeratorCancellation] CancellationToken ct = default)
    {
        while (!ct.IsCancellationRequested)
        {
            yield return $"Server time: {DateTimeOffset.UtcNow:O}";
            await Task.Delay(1000, ct);
        }
    }
 
    // Sends SSE data using built-in result support
    return Results.ServerSentEvents(Stream());
});

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