Claude docs changes for February 15th, 2026 [diff]

Executive Summary

• New comprehensive C# SDK documentation added with 42 files covering Messages API, Models, Skills, Files, and Batches
• Admin API documentation updated with standardized HTTP verb formatting (capitalization)

API changes

New Documents

C# SDK - Beta [Source]

New C# SDK beta documentation section covering error models and beta API features.

C# SDK - Beta Files [Source]

Documentation for C# SDK beta file operations including upload, download, retrieval, and deletion.

Delete a File

C# SDK documentation for deleting files via the beta Files API.

Download File Content

C# SDK documentation for downloading file content from the beta Files API.

List Files

C# SDK documentation for listing files via the beta Files API.

Retrieve File Metadata

C# SDK documentation for retrieving file metadata from the beta Files API.

C# SDK - Beta Messages [Source]

Comprehensive C# SDK documentation for the beta Messages API including message creation, token counting, and streaming.

Beta Messages Batches

C# SDK documentation for batch message operations in beta.

Cancel a Message Batch

C# SDK documentation for canceling message batches.

Create a Message Batch

C# SDK documentation for creating message batches for bulk processing.

Delete a Message Batch

C# SDK documentation for deleting message batches.

List Message Batches

C# SDK documentation for listing message batches.

Retrieve Message Batch Results

C# SDK documentation for retrieving results from message batches.

Retrieve a Message Batch

C# SDK documentation for retrieving message batch details.

Count Tokens in a Message

C# SDK documentation for counting tokens in messages before sending them.

Create a Message

C# SDK documentation for creating messages with the beta Messages API.

C# SDK - Beta Models [Source]

C# SDK documentation for working with Claude models in beta.

List Models

C# SDK documentation for listing available Claude models.

Retrieve Model Information

C# SDK documentation for retrieving detailed information about specific models.

C# SDK - Beta Skills [Source]

C# SDK documentation for managing skills in the beta API.

Create a Skill

C# SDK documentation for creating new skills.

Delete a Skill

C# SDK documentation for deleting skills.

List Skills

C# SDK documentation for listing available skills.

Retrieve a Skill

C# SDK documentation for retrieving skill details.

Skill Versions

C# SDK documentation for managing skill versions.

Create a Skill Version

C# SDK documentation for creating new versions of skills.

Delete a Skill Version

C# SDK documentation for deleting skill versions.

List Skill Versions

C# SDK documentation for listing versions of a skill.

Retrieve a Skill Version

C# SDK documentation for retrieving details about a specific skill version.

C# SDK - Messages [Source]

Comprehensive C# SDK documentation for the stable Messages API including all message operations and model definitions.

Messages Batches

C# SDK documentation for batch operations in the stable Messages API.

Cancel a Message Batch

C# SDK documentation for canceling message batches in the stable API.

Create a Message Batch

C# SDK documentation for creating message batches in the stable API.

Delete a Message Batch

C# SDK documentation for deleting message batches in the stable API.

List Message Batches

C# SDK documentation for listing message batches in the stable API.

Retrieve Message Batch Results

C# SDK documentation for retrieving results from message batches in the stable API.

Retrieve a Message Batch

C# SDK documentation for retrieving message batch details in the stable API.

Count Tokens in a Message

C# SDK documentation for counting tokens in messages in the stable API.

Create a Message

C# SDK documentation for creating messages with detailed parameter descriptions and example code.

C# SDK - Models [Source]

C# SDK documentation for working with Claude models in the stable API.

List Models

C# SDK documentation for listing available models in the stable API.

Retrieve Model Information

C# SDK documentation for retrieving model details in the stable API.

Changed documents

Admin API [Source]

• HTTP method formatting standardized - changed from lowercase to uppercase (GET, POST, DELETE). [lines 15, 39, 43, 47, 51, 115, 119, 123, 127, 177, 181]

API Keys - List [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

API Keys - Retrieve [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

API Keys - Update [Source]

• HTTP method formatting standardized to uppercase POST. [line 12] [Source]

Cost Report - Retrieve [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Invites - Create [Source]

• HTTP method formatting standardized to uppercase POST. [line 12] [Source]

Invites - Delete [Source]

• HTTP method formatting standardized to uppercase DELETE. [line 12] [Source]

Invites - List [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Invites - Retrieve [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Organizations - Me [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Usage Report - Retrieve Claude Code [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Usage Report - Retrieve Messages [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Users - Delete [Source]

• HTTP method formatting standardized to uppercase DELETE. [line 12] [Source]

Users - List [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Users - Retrieve [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Users - Update [Source]

• HTTP method formatting standardized to uppercase POST. [line 12] [Source]

Workspaces - Archive [Source]

• HTTP method formatting standardized to uppercase POST. [line 12] [Source]

Workspaces - Create [Source]

• HTTP method formatting standardized to uppercase POST. [line 12] [Source]

Workspaces - List [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Workspaces - Members - Create [Source]

• HTTP method formatting standardized to uppercase POST. [line 12] [Source]

Workspaces - Members - Delete [Source]

• HTTP method formatting standardized to uppercase DELETE. [line 12] [Source]

Workspaces - Members - List [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Workspaces - Members - Retrieve [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Workspaces - Members - Update [Source]

• HTTP method formatting standardized to uppercase POST. [line 12] [Source]

Workspaces - Retrieve [Source]

• HTTP method formatting standardized to uppercase GET. [line 12] [Source]

Workspaces - Update [Source]

• HTTP method formatting standardized to uppercase POST. [line 12] [Source]