add xml comments for AgentId.cs

dotnet/src/Microsoft.AutoGen/Contracts/PythonEquiv/AgentId.cs

@@ -6,30 +6,74 @@ using System.Diagnostics.CodeAnalysis;
 
 namespace Microsoft.AutoGen.Contracts.Python;
 
+/// <summary>
+/// Agent ID uniquely identifies an agent instance within an agent runtime, including a distributed runtime.
+/// It serves as the "address" of the agent instance for receiving messages.
+/// </summary>
+/// See the Python equivalent: 
+/// <see href="https://microsoft.github.io/autogen/stable/reference/python/autogen_core.html#autogen_core.AgentId">AgentId in AutoGen (Python)</see>.
+/// </remarks>
 [DebuggerDisplay($"AgentId(type=\"{nameof(Type)}\", key=\"{nameof(Key)}\")")]
 public struct AgentId
 {
+    /// <summary>
+    /// An identifier that associates an agent with a specific factory function.  
+    /// Strings may only be composed of alphanumeric letters (a-z) and (0-9), or underscores (_).
+    /// </summary>
     public string Type;
+
+    /// <summary>
+    /// Agent instance identifier.  
+    /// Strings may only be composed of alphanumeric letters (a-z) and (0-9), or underscores (_).
+    /// </summary>
     public string Key;
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="AgentId"/> struct.
+    /// </summary>
+    /// <param name="type">The agent type.</param>
+    /// <param name="key">Agent instance identifier.</param>
     public AgentId(string type, string key)
     {
         Type = type;
         Key = key;
     }
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="AgentId"/> struct from a tuple.
+    /// </summary>
+    /// <param name="kvPair">A tuple containing the agent type and key.</param>
     public AgentId((string Type, string Key) kvPair) : this(kvPair.Type, kvPair.Key)
     {
     }
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="AgentId"/> struct from an <see cref="AgentType"/>.
+    /// </summary>
+    /// <param name="type">The agent type.</param>
+    /// <param name="key">Agent instance identifier.</param>
     public AgentId(AgentType type, string key) : this(type.Name, key)
     {
     }
 
+    /// <summary>
+    /// Convert a string of the format "type/key" into an <see cref="AgentId"/>.
+    /// </summary>
+    /// <param name="maybeAgentId">The agent ID string.</param>
+    /// <returns>An instance of <see cref="AgentId"/>.</returns>
     public static AgentId FromStr(string maybeAgentId) => new AgentId(maybeAgentId.ToKVPair(nameof(Type), nameof(Key)));
 
+    /// <summary>
+    /// Returns the string representation of the <see cref="AgentId"/>.
+    /// </summary>
+    /// <returns>A string in the format "type/key".</returns>
     public override string ToString() => $"{Type}/{Key}";
 
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="AgentId"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current instance.</param>
+    /// <returns><c>true</c> if the specified object is equal to the current <see cref="AgentId"/>; otherwise, <c>false</c>.</returns>
     public override bool Equals([NotNullWhen(true)] object? obj)
     {
         if (obj is AgentId other)
@@ -40,11 +84,20 @@ public struct AgentId
         return false;
     }
 
+    /// <summary>
+    /// Returns a hash code for this <see cref="AgentId"/>.
+    /// </summary>
+    /// <returns>A hash code for the current instance.</returns>
     public override int GetHashCode()
     {
         return HashCode.Combine(Type, Key);
     }
 
+    /// <summary>
+    /// Explicitly converts a string to an <see cref="AgentId"/>.
+    /// </summary>
+    /// <param name="id">The string representation of an agent ID.</param>
+    /// <returns>An instance of <see cref="AgentId"/>.</returns>
     public static explicit operator AgentId(string id) => FromStr(id);
 }