diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..cc1f0b1
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,7 @@
+All documentation, branch names, variable and method names, and comments must use American English. Pull request titles and commit messages must also be in English.
+Do not create additional AGENTS.md files.
+Do not use the `--no-build` parameter when running the application or tests, as it leads to missing libraries.
+All tests should use xUnit with the FluentAssertions package.
+Information about available classes and methods from the standard List and List<T> operations is documented in README.md. Additional compatibility methods are distributed across NuGet packages.
+Before adding, modifying, or removing methods or classes, review the README files from related repositories (links will be added later).
+Projects and tests must target .NET 8 by default and also support .NET 9, .NET 7, and .NET 6. Use the latest available C# language features when possible.
diff --git a/README.md b/README.md
index 9b3e070..151691a 100644
--- a/README.md
+++ b/README.md
@@ -1,22 +1,181 @@
-# Recyclable.Collections.Compatibility.List
-`Recyclable.Collections.Compatibility.List` project is an open source add-on for [Recyclable.Collections](https://github.com/mlemanczyk/Recyclable.Collections) providing `List<T>` compatibility features to the recyclable collections framework.
+# Recyclable.Collections.Compatibility.List
+`Recyclable.Collections.Compatibility.List` is an open source add-on for [Recyclable.Collections](https://github.com/mlemanczyk/Recyclable.Collections). It provides compatibility APIs that mirror `List<T>` and larger list implementations while reusing memory through recyclable pools.
 
 ## Included compatibility packs
-* `RecyclableList<T>`
+- `RecyclableList<T>`
 
-# Milestones
+## Milestones
 1. 👉 Implement compatibility pack
-	1. ✅ `RecyclableList<T>`
-	1. 👉 `RecyclableLongList<T>`
-	1. 🅿️ `RecyclableQueue<T>`
-	1. 🅿️ `RecyclableSortedList<T>`
-	1. 🅿️ `RecyclableStack<T>`
-	1. 🅿️ `RecyclableUnorderedList<T>`
+        1. ✅ `RecyclableList<T>`
+        1. 👉 `RecyclableLongList<T>`
+        1. 🅿️ `RecyclableQueue<T>`
+        1. 🅿️ `RecyclableSortedList<T>`
+        1. 🅿️ `RecyclableStack<T>`
+        1. 🅿️ `RecyclableUnorderedList<T>`
 1. 🅿️ Review performance
 1. 🅿️ Optimize performance
 
-# Characteristics of the classes
-The package 
+## Characteristics of the classes
+All classes use [Recyclable.Collections](https://github.com/mlemanczyk/Recyclable.Collections) internally to minimize memory allocations.
 
-## Common
-* All classes will internally or externally utilize [Recyclable.Collections](https://github.com/mlemanczyk/Recyclable.Collections) to benefit from recyclable memory pools.
+### Current collections
+- `RecyclableList<T>` – drop-in replacement for `List<T>`.
+- `RecyclableLongList<T>` – supports capacities greater than `int.MaxValue`; currently partially implemented.
+
+### Planned collections
+The following types are planned but not yet implemented. Method signatures are subject to change and will mirror their .NET equivalents.
+- `RecyclableQueue<T>` – equivalent to `Queue<T>`.
+- `RecyclableSortedList<T>` – equivalent to `SortedList<TKey,TValue>`.
+- `RecyclableStack<T>` – equivalent to `Stack<T>`.
+- `RecyclableUnorderedList<T>` – unordered list similar to `HashSet<T>`.
+
+### Standard .NET collections not provided here
+This repository does not currently include recyclable versions of:
+- `LinkedList<T>`
+- `Dictionary<TKey,TValue>`
+- `HashSet<T>`
+- `ObservableCollection<T>`
+
+## Extension classes and methods
+The compatibility API is implemented through a set of extension classes. The lists below show the available and planned methods.
+
+### `zzzRecyclableListCompatibilityList`
+File: `RecyclableList.Compatibility.List.cs`
+```csharp
+ReadOnlyCollection<T> AsReadOnly<T>(this RecyclableList<T> list)
+int BinarySearch<T>(this RecyclableList<T> list, T item)
+int BinarySearch<T>(this RecyclableList<T> list, T item, IComparer<T>? comparer)
+int BinarySearch<T>(this RecyclableList<T> list, int index, int count, T item, IComparer<T>? comparer)
+RecyclableList<TOutput> ConvertAll<T, TOutput>(this RecyclableList<T> list, Converter<T, TOutput> converter)
+void CopyTo<T>(this RecyclableList<T> list, T[] array)
+void CopyTo<T>(this RecyclableList<T> list, int index, T[] array, int arrayIndex, int count)
+void ForEach<T>(this RecyclableList<T> list, Action<T> action)
+RecyclableList<T> GetRange<T>(this RecyclableList<T> list, int index, int count)
+int RemoveAll<T>(this RecyclableList<T> list, Predicate<T> match)
+void RemoveRange<T>(this RecyclableList<T> list, int index, int count)
+void Reverse<T>(this RecyclableList<T> list)
+void Reverse<T>(this RecyclableList<T> list, int index, int count)
+void Sort<T>(this RecyclableList<T> list)
+void Sort<T>(this RecyclableList<T> list, Comparison<T> comparison)
+void Sort<T>(this RecyclableList<T> list, IComparer<T>? comparer)
+void Sort<T>(this RecyclableList<T> list, int index, int count, IComparer<T>? comparer)
+T[] ToArray<T>(this RecyclableList<T> list)
+void TrimExcess<T>(this RecyclableList<T> list)
+bool TrueForAll<T>(this RecyclableList<T> list, Predicate<T> match)
+```
+
+### `zzzRecyclableListCompatibilityListInsertRange`
+File: `RecyclableList.Compatibility.List.InsertRange.cs`
+```csharp
+void InsertRange<T>(this RecyclableList<T> list, int index, in Array items)
+void InsertRange<T>(this RecyclableList<T> list, int index, in T[] items)
+void InsertRange<T>(this RecyclableList<T> list, int index, ReadOnlySpan<T> items)
+void InsertRange<T>(this RecyclableList<T> list, int index, Span<T> items)
+void InsertRange<T>(this RecyclableList<T> list, int index, List<T> items)
+void InsertRange<T>(this RecyclableList<T> list, int index, ICollection items)
+void InsertRange<T>(this RecyclableList<T> list, int index, ICollection<T> items)
+void InsertRange<T>(this RecyclableList<T> list, int index, RecyclableList<T> items)
+void InsertRange<T>(this RecyclableList<T> list, int index, RecyclableLongList<T> items)
+void InsertRange<T>(this RecyclableList<T> list, int index, IEnumerable items, int growByCount = RecyclableDefaults.MinPooledArrayLength)
+void InsertRange<T>(this RecyclableList<T> list, int index, IReadOnlyList<T> items)
+void InsertRange<T>(this RecyclableList<T> list, int index, IEnumerable<T> items, int growByCount = RecyclableDefaults.MinPooledArrayLength)
+```
+
+### `zzzRecyclableListCompatibilityListIndexOf`
+File: `RecyclableList.Compatibility.List.IndexOf.cs`
+```csharp
+int LastIndexOf<T>(this RecyclableList<T> list, T item)
+int LastIndexOf<T>(this RecyclableList<T> list, T item, int index)
+int LastIndexOf<T>(this RecyclableList<T> list, T item, int index, int count)
+```
+
+### `zzzRecyclableListCompatibilityListFind`
+File: `RecyclableList.Compatibility.List.Find.cs`
+```csharp
+bool Exists<T>(this RecyclableList<T> list, Predicate<T> match)
+T? Find<T>(this RecyclableList<T> list, Predicate<T> match)
+RecyclableList<T> FindAll<T>(this RecyclableList<T> list, Predicate<T> match)
+RecyclableList<int> FindAllIndexes<T>(this RecyclableList<T> list, Predicate<T> match)
+int FindIndex<T>(this RecyclableList<T> list, int startIndex, int count, Predicate<T> match)
+int FindIndex<T>(this RecyclableList<T> list, int startIndex, Predicate<T> match)
+int FindIndex<T>(this RecyclableList<T> list, Predicate<T> match)
+T? FindLast<T>(this RecyclableList<T> list, Predicate<T> match)
+int FindLastIndex<T>(this RecyclableList<T> list, int startIndex, int count, Predicate<T> match)
+int FindLastIndex<T>(this RecyclableList<T> list, int startIndex, Predicate<T> match)
+int FindLastIndex<T>(this RecyclableList<T> list, Predicate<T> match)
+```
+
+### `zzzRecyclableLongListCompatibilityList`
+File: `RecyclableLongList.Compatibility.List.cs`
+```csharp
+ReadOnlyCollection<T> AsReadOnly<T>(this RecyclableLongList<T> list)
+int BinarySearch<T>(this RecyclableLongList<T> list, T item)
+int BinarySearch<T>(this RecyclableLongList<T> list, T item, IComparer<T>? comparer)
+int BinarySearch<T>(this RecyclableLongList<T> list, int index, int count, T item, IComparer<T>? comparer)
+RecyclableLongList<TOutput> ConvertAll<T, TOutput>(this RecyclableLongList<T> list, Converter<T, TOutput> converter)
+void CopyTo<T>(this RecyclableLongList<T> list, T[] array)
+void CopyTo<T>(this RecyclableLongList<T> list, int index, T[] array, int arrayIndex)
+void CopyTo<T>(this RecyclableLongList<T> list, int index, T[] array, int arrayIndex, int count)
+void ForEach<T>(this RecyclableLongList<T> list, Action<T> action)
+RecyclableLongList<T> GetRange<T>(this RecyclableLongList<T> list, int startIndex, int count)
+```
+Internal methods still to be implemented:
+```csharp
+int RemoveAll<T>(this RecyclableLongList<T> list, Predicate<T> match)
+void RemoveRange<T>(this RecyclableLongList<T> list, int index, int count)
+void Reverse<T>(this RecyclableLongList<T> list)
+void Reverse<T>(this RecyclableLongList<T> list, int index, int count)
+void Sort<T>(this RecyclableLongList<T> list)
+void Sort<T>(this RecyclableLongList<T> list, Comparison<T> comparison)
+void Sort<T>(this RecyclableLongList<T> list, IComparer<T>? comparer)
+void Sort<T>(this RecyclableLongList<T> list, int index, int count, IComparer<T>? comparer)
+T[] ToArray<T>(this RecyclableLongList<T> list)
+void TrimExcess<T>(this RecyclableLongList<T> list)
+bool TrueForAll<T>(this RecyclableLongList<T> list, Predicate<T> match)
+```
+
+### `zzzRecyclableLongListCompatibilityListFind`
+File: `RecyclableLongList.Compatibility.List.Find.cs`
+```csharp
+bool Exists<T>(this RecyclableLongList<T> list, Predicate<T> match)
+T? Find<T>(this RecyclableLongList<T> list, Predicate<T> match)
+RecyclableLongList<T> FindAll<T>(this RecyclableLongList<T> list, Predicate<T> match)
+RecyclableLongList<long> FindAllIndexes<T>(this RecyclableLongList<T> list, Predicate<T> match)
+int FindIndex<T>(this RecyclableLongList<T> list, int startIndex, int count, Predicate<T> match)
+int FindIndex<T>(this RecyclableLongList<T> list, int startIndex, Predicate<T> match)
+int FindIndex<T>(this RecyclableLongList<T> list, Predicate<T> match)
+T? FindLast<T>(this RecyclableLongList<T> list, Predicate<T> match)
+int FindLastIndex<T>(this RecyclableLongList<T> list, int startIndex, int count, Predicate<T> match)
+int FindLastIndex<T>(this RecyclableLongList<T> list, int startIndex, Predicate<T> match)
+int FindLastIndex<T>(this RecyclableLongList<T> list, Predicate<T> match)
+```
+
+### `zzzRecyclableLongListCompatibilityListIndexOf`
+File: `RecyclableLongList.Compatibility.List.IndexOf.cs`
+Internal methods planned:
+```csharp
+int LastIndexOf<T>(this RecyclableLongList<T> list, T item)
+int LastIndexOf<T>(this RecyclableLongList<T> list, T item, int index)
+int LastIndexOf<T>(this RecyclableLongList<T> list, T item, int index, int count)
+```
+
+### `zzzRecyclableLongListCompatibilityListInsertRange`
+File: `RecyclableLongList.Compatibility.List.InsertRange.cs`
+All methods are internal placeholders and currently throw `NotImplementedException`:
+```csharp
+void InsertRange<T>(this RecyclableLongList<T> list, int index, in Array items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, in T[] items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, ReadOnlySpan<T> items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, Span<T> items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, List<T> items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, ICollection items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, ICollection<T> items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, RecyclableList<T> items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, RecyclableLongList<T> items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, IEnumerable items, int growByCount = RecyclableDefaults.MinPooledArrayLength)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, IReadOnlyList<T> items)
+void InsertRange<T>(this RecyclableLongList<T> list, int index, IEnumerable<T> items, int growByCount = RecyclableDefaults.MinPooledArrayLength)
+```
+
+## Testing
+The unit tests are written with **xUnit** and **FluentAssertions**. Projects and tests target **.NET 8** by default and also support **.NET 9**, **.NET 7**, and **.NET 6**.
diff --git a/Recyclable.Collections.Compatibility.List.Benchmarks/Recyclable.Collections.Compatibility.List.Benchmarks.csproj b/Recyclable.Collections.Compatibility.List.Benchmarks/Recyclable.Collections.Compatibility.List.Benchmarks.csproj
index 028a0c0..aa9cfd3 100644
--- a/Recyclable.Collections.Compatibility.List.Benchmarks/Recyclable.Collections.Compatibility.List.Benchmarks.csproj
+++ b/Recyclable.Collections.Compatibility.List.Benchmarks/Recyclable.Collections.Compatibility.List.Benchmarks.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+    <TargetFrameworks>net8.0;net9.0;net7.0;net6.0</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/Recyclable.Collections.Compatibility.List.Tests/Recyclable.Collections.Compatibility.List.Tests.csproj b/Recyclable.Collections.Compatibility.List.Tests/Recyclable.Collections.Compatibility.List.Tests.csproj
index ab07c6c..0371962 100644
--- a/Recyclable.Collections.Compatibility.List.Tests/Recyclable.Collections.Compatibility.List.Tests.csproj
+++ b/Recyclable.Collections.Compatibility.List.Tests/Recyclable.Collections.Compatibility.List.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+                <TargetFrameworks>net8.0;net9.0;net7.0;net6.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 
diff --git a/Recyclable.Collections.Compatibility.List/Recyclable.Collections.Compatibility.List.csproj b/Recyclable.Collections.Compatibility.List/Recyclable.Collections.Compatibility.List.csproj
index 8e1cf8a..8b3c1a0 100644
--- a/Recyclable.Collections.Compatibility.List/Recyclable.Collections.Compatibility.List.csproj
+++ b/Recyclable.Collections.Compatibility.List/Recyclable.Collections.Compatibility.List.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+                <TargetFrameworks>net8.0;net9.0;net7.0;net6.0</TargetFrameworks>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>