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Support DefaultValueAttribute in AIFunctionFactory parameter handling - #6947
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- Check for DefaultValueAttribute when determining parameter optionality - Use DefaultValueAttribute value as default when parameter not provided - Add helper methods HasEffectiveDefaultValue and GetEffectiveDefaultValue - Add comprehensive tests for DefaultValue attribute support Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Verify that when both DefaultValue attribute and C# default are present, the DefaultValue attribute takes precedence. Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
- Add test verifying DefaultValue attribute takes precedence over C# default - Add .nuget directory to gitignore to exclude build artifacts Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
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[WIP] Fix handling of DefaultValue attribute in optional parameters
Support DefaultValueAttribute in AIFunctionFactory parameter handling
Oct 22, 2025
stephentoub
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October 22, 2025 13:52
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Pull Request Overview
This PR adds support for the [DefaultValue] attribute in AIFunctionFactory, ensuring parameters decorated with this attribute are treated as optional in the same way as parameters with C# default value syntax.
Key Changes:
- Added helper methods to detect and retrieve default values from both
[DefaultValue]attribute and C# default syntax - Updated schema generation to correctly mark parameters with
[DefaultValue]as optional - Updated parameter marshaling to use default values from
[DefaultValue]attribute
Reviewed Changes
Copilot reviewed 3 out of 5 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| AIJsonUtilities.Schema.Create.cs | Added HasEffectiveDefaultValue() and GetEffectiveDefaultValue() helpers to check for both C# defaults and [DefaultValue] attribute; updated schema generation logic to use these helpers |
| AIFunctionFactory.cs | Added duplicate helper methods and updated parameter marshaling to respect [DefaultValue] attribute |
| AIFunctionFactoryTest.cs | Added comprehensive test coverage for [DefaultValue] attribute functionality including null values, non-null values, and precedence scenarios |
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stephentoub
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Oct 22, 2025
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@copilot, please fix the formatting diagnostics:
Build FAILED.
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(69,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(75,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(78,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(81,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(87,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(90,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(96,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(99,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(105,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net9.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(69,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(75,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(78,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(81,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(87,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(90,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(96,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(99,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Functions/AIFunctionFactoryTest.cs(105,1): error IDE0055: Fix formatting (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0055) [/mnt/vss/_work/1/s/test/Libraries/Microsoft.Extensions.AI.Tests/Microsoft.Extensions.AI.Tests.csproj::TargetFramework=net8.0]
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- Revert changes to .gitignore - Fix formatting issues in test file (remove extra blank lines) - Make HasEffectiveDefaultValue and GetEffectiveDefaultValue internal in AIJsonUtilities - Remove duplicate helper methods from AIFunctionFactory and use the ones from AIJsonUtilities Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
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stephentoub
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Oct 22, 2025
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Use a longer, more descriptive parameter name to avoid false positives when searching for the parameter name in string assertions. Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Replace HasEffectiveDefaultValue and GetEffectiveDefaultValue with a single TryGetEffectiveDefaultValue method to avoid resolving the DefaultValueAttribute multiple times, improving performance. Co-authored-by: eiriktsarpalis <2813363+eiriktsarpalis@users.noreply.github.com>
This was referenced Nov 19, 2025
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Looks like this PR added a nuget.exe to the repo :( |
Member
Ugh |
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I noticed copilot did this in a couple other PRs and I think we gave feedback around this. |
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I don't know why, but I'm not able to react to posts in this thread. So adding it here: 👀 |
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[DefaultValue(null)]are treated as required instead of optionalParameterInfo.IsOptionalandParameterInfo.HasDefaultValueare false for[DefaultValue]attributesSummary
Successfully implemented support for the
[DefaultValue]attribute in AIFunctionFactory. Parameters decorated with[DefaultValue]are now treated as optional in the JSON schema and function invocation, matching the behavior of C# default values.Changes Made:
TryGetEffectiveDefaultValuehelper method to check for and retrieve default values from both C# defaults and DefaultValueAttribute in a single callSecurity Considerations:
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