Release MCP 2025-11-25 specification full support · simonx1/ruby-mcp-client

1.0.0 (2026-02-15)

Full implementation of the MCP 2025-11-25 specification, upgrading from 2025-06-18.

Audio Content: Support for audio content type in tool results and messages (#82)
Resource Annotations: Added lastModified field to resource annotations (#83)
Enhanced Tool Annotations: Hint-style annotation API (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) alongside legacy annotations (#84)
Enhanced Elicitation: Improved server-initiated user interaction support for MCP 2025-11-25 (#85)
Enhanced Sampling: Added modelPreferences support for server-requested LLM completions (#86)
Completion Context: Completion requests now support context parameter for MCP 2025-11-25 (#87)
Structured Task Management: Server-driven task tracking with tasks/list, tasks/get, progress notifications, and cancellation (#88)
ResourceLink Content Type: New content type for linking to MCP resources from tool results (#89)
Tool Title: Optional human-readable title field for tools, separate from the programmatic name (by @conr) (#72)

Mcp-Protocol-Version Header: All HTTP transports now send the negotiated protocol version header on post-initialization requests, as required by the MCP spec
Protocol version captured from server initialize response and used in all subsequent requests

Parameter Validation: validate_params! now skips required parameters that have a default value in the schema, fixing compatibility with Playwright MCP and other Zod-based servers
Anthropic Tool Schema Cleaning: to_anthropic_tool now strips $schema keys from tool schemas, preventing 400 errors from the Anthropic Messages API
Streamable HTTP Example: Updated to use environment variables for server URL and Bearer token authentication instead of hardcoded credentials
Anthropic Example: Fixed model name to use current claude-sonnet-4-5-20250929
Fixed JSON parsing edge cases