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Proposal 4.1: CallId — Simplified Analysis & Options

Summary

ToolCallContent.CallId and ToolResultContent.CallId are currently required non-null (Throw.IfNull). Not all provider wire types have a natural correlation identifier.

Of 64 tool call/output wire types across 4 providers, 15 lack a natural non-null CallId:

| Provider | Wire Type | Role | Family | Notes |

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Tool Output Types -- Cross-Provider Inventory

OpenAI (12 output types)

Resource/ItemParam variants (e.g., FunctionToolCallOutputResource, ApplyPatchToolCallOutputItemParam) are the same shape at different API boundaries -- omitted for simplicity.

Wire Type	Role	Family	In MEAI?	Wire output property
FunctionToolCallOutput	output	function	Yes (FunctionResultContent)	output (string)

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namespace System.IO;

public abstract class NewStream : Stream
{
    private bool _disposed;

    public sealed override int Read(byte[] buffer, int offset, int count)
    {
        ValidateBufferArguments(buffer, offset, count);
        return Read(buffer.AsSpan(offset, count));

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public abstract class Stream2022 : Stream
{
    public sealed override int Read(byte[] buffer, int offset, int count)
        => Read(buffer.AsSpan(offset, count));

    public abstract override int Read(Span<byte> buffer);

    public sealed override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
        => ReadAsync(buffer.AsMemory(offset, count), cancellationToken).AsTask();

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Legend

• Statistical Test threshold: 10%, the noise filter: 2 ns
• Result is conclusion: Slower|Faster|Same|Noise|Unknown. Noise means that the difference was larger than 10% but not 2 ns.
• Ratio = Base/Diff (the higher the better).
• Alloc Delta = Allocated bytes diff - Allocated bytes base (the lower the better)

Statistics

Total: 86862

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public class TempWorkingDirectory
{
    string _directory;
    public TempWorkingDirectory(string directory)
    {
        _directory = directory;
    }

    public void CreateFile(string filepath)
    {

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How to install

1. Add dotnet7 nuget feed (https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet7/nuget/v3/index.json) in your Package Sources.
2. Search and install System.Security.Cryptography.Cose. Don't forget to check the "Include prerelease" checkbox.

Encode and Sign

using System.Security.Cryptography;

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// Assuming that you have a list of `Employee`s and you have to serialize each one individually 
// and you also want to take advantage of the references saved in the `ReferenceHandler`'s resolver.
using System;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace ConsoleApp4
{
    class Program

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// Assuming that you wrote a custom converter for `Company` and you don't want to manually serialize the `Supervisor`, which is an `Employee`. 
// you want to delegate that to the Serializer and you also want to preserve the references that you have already saved.

using System;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace ConsoleApp4
{