Dependencies

Runtime

• Language: C# (LangVersion latest)
• TFMs (libraries): net8.0; net9.0; net10.0 (default from Src/Directory.Build.props)
• Exceptions: Generator → netstandard2.0; Attributes → netstandard2.0 + net8/9/10; Agents Mcp/A2A → net9.0;net10.0
• Tests / harnesses: net10.0
• ASP.NET: FrameworkReference Microsoft.AspNetCore.App where needed

Packages

• Central versions: root Directory.Packages.props (ManagePackageVersionsCentrally)
• Do not duplicate PackageVersion in leaf projects; use PackageReference Include only
• NuGet audit mode: direct

Key libraries

Library	Role
FluentValidation	Request validators
Microsoft.AspNetCore.Authentication.JwtBearer	Security package (version per TFM)
Microsoft.AspNetCore.OpenApi / Scalar.AspNetCore	OpenAPI docs (modern path)
NSwag.*	Legacy Swagger/ClientGen (deprecate note in Directory.Packages.props)
Grpc.AspNetCore.Server / Grpc.Net.Client*	Remote messaging
MessagePack	Default RPC marshalling
protobuf-net / Grpc.Reflection	Protobuf wire format + gRPC reflection (Messaging.Remote.Reflection only)
Microsoft.AspNetCore.OData	OData package
ModelContextProtocol.AspNetCore	Agents MCP; v2.x targets the 2026-07-28 MCP spec (stateless-by-default transport, backward compatible with the addon's v1-style handler wiring)
Microsoft.CodeAnalysis.CSharp [4.11.0]	Generators; pinned for net8 compatibility (comment in props)
Microsoft.OpenApi.Kiota.Builder [1.29.1]	Pinned; Kiota OpenAPI 3.x vs AspNetCore.OpenApi 2.x mismatch
xunit.v3, Shouldly, FakeItEasy, Bogus	Test stack
BenchmarkDotNet, NBomber	Benchmarks / load

Constraints

• Bump of Microsoft.CodeAnalysis.CSharp or Kiota builder needs explicit compatibility validation (comments in Directory.Packages.props).
• TFM-conditional package versions for JwtBearer, TestHost, Mvc.Testing, Asp.Versioning (8/9/10 groups).
• Library version single-sourced in Src/Directory.Build.props; Agents override Version per csproj.
• Strong-name key required for pack/sign; InternalsVisibleTo entries must use the public key.

Sources

• Directory.Packages.props
• Src/Directory.Build.props
• Src/Library/FastEndpoints.csproj
• Src/Generator/FastEndpoints.Generator.csproj