# Claude Code v1.0.21

> Claude Code v1.0.21, released 11 Jun 2025 (2025-06-11). 4 entries read out of the shipped bundle. Unofficial, and not affiliated with Anthropic.

Web version: https://changelogs.core-directive.com/v/1.0.21

## Changes

### New Features

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`

### Improvements

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

### Technical Improvements

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

### MCP Integration Examples

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.