framework
.NET 10 is Microsoft's cross-platform runtime, SDK, and framework for building and running applications across web, desktop, cloud, and mobile.
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Sekiban DCB's Decider template ships three worked feature slices for an agent to copy. In this walkthrough, review, implementation, build, concurrency tests on a real PostgreSQL database and UI fixes took under an hour.
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The absolute numbers describe an i5 in Docker with about 8 GB available, and the author says the relations between the profiles are hypotheses for you to retest rather than results any other service can inherit.
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OpenAI's create response reference is explicit that a chained request does not inherit earlier instructions, and because the field is optional, the turn that loses your JSON contract or your safety text still succeeds.
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The combination of InlineArray and an explicit StructLayout.Size still compiles on .NET 10, and then throws TypeLoadException the first time the type loads, which can be a cold interop path inside a dependency you did not build.
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On .NET 9 a lone UTF-16 surrogate in a virtual list view target became EF BF BD and reached the server as a target the application never chose. On .NET 10 the encoder refuses, and the failure lands at the client.
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In the final 2026-07-28 MCP spec, an empty nextCursor means keep going. A falsy check ends the loop instead, and the call still returns success.
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NU1015 replaces a warning that used to resolve the lowest version on the feed. The same markup is correct under Central Package Management, so the error names a symptom, not an owner.
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The rendered message still sits at the top level, but code that walked into State to find it now gets null with no error. Microsoft calls the change a behavioral breaking change.
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The new tools spec lets structuredContent be any JSON value. A client hard-coded to read structuredContent.result keeps compiling, keeps passing, and starts finding nothing on the wire.
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The finalized Streamable HTTP transport mirrors tool arguments into Mcp-Param-* headers. A bad suffix, an excluded type, or an unreachable annotation kills the tool definition, so validate before tools/list.
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Microsoft.Testing.Platform streams results during the run instead of at clean shutdown. That only pays off if your CI uploads artifacts after a failing test step.
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