Claude Code v1.0.21

MCP Prompts Support

• Added support for MCP (Model Context Protocol) prompts functionality
• New methods available for MCP servers:
• prompts/get - Retrieve a specific prompt by name with optional arguments
• prompts/list - List all available prompts from an MCP server
• Added prompt list change notifications support via notifications/prompts/list_changed

Enhanced OAuth/Authentication Flow

• Improved OAuth client information handling during authorization flows
• Better support for dynamic OAuth client registration
• Enhanced client metadata persistence when exchanging authorization codes
• More robust handling of OAuth redirect URLs with proper client ID parameters

Error Handling Enhancements

• Added validation for server capability requirements:
• Prompts support verification for MCP servers
• Proper error messages when servers don't support required features
• Better error reporting for incompatible authentication servers
• Improved validation for OAuth response types and code challenge methods

• Enhanced session ID handling in connection establishment
• Better support for client information persistence across OAuth flows
• Improved error state tracking with optional isError flag

When connecting to an MCP server that supports prompts, you can now:

# List all available prompts from a connected MCP server
claude code mcp list-prompts

# Get a specific prompt with arguments
claude code mcp get-prompt "code-review" --args '{"language": "javascript"}'

This version focuses on expanding MCP capabilities and improving the robustness of OAuth authentication flows, making it easier to integrate with various MCP servers and maintain secure connections.