2025-05-13 - Mastra Release

Agents

Preserve existing thread metadata when the generateTitle flag is set. #4160
Integrates workflows into agents. #4199 [IMPORTANT]
Fix recursion issue in the codebase. #4205
Fix bug where the zodSchema shape could cause runtime errors when loading toolsets from SSE MCPs, ensuring safer schema handling. #4207
Fix agent listen #4150. #4218
Workflow support to the agent server handlers. #4223

Fix resume workflow when throwing 'workflow run not found' error. #4170
An issue where the watch workflow was not streaming responses back in the legacy workflow. #4185

The playground to set the runtime context for agents, tools, and workflows. #4146 IMPORTANT]
'instructions' API feature changed to be available only in the playground. #4204

Fix bug in the client-js by specifying $refStrategy: 'none' when calling zodToJsonSchema to prevent provider errors with shared zod schemas. #4149
Support for custom message ID generation via experimental_generateMessageId in core, and removes it from client-js types due to its non-serializable nature. #4191
Add limit query option to the client-js getMessages function, allowing control over the number of messages retrieved. #4222

Support for passing MCP servers to the mastra class, introduces new API endpoints for posting messages and SSE capabilities to MCP servers, and maintains compatibility with deprecated MCP specifications. #4131[IMPORTANT]
Add Mastra Linting to code and updates related documentation. #4179

The post-create instructions in the create command now display the correct package manager command based on the user's environment, improving accuracy and user experience. #4153
Fix documentation search UI and fixes errors related to multiple tool calls in AGUI chat. #4183
Add Node.js engine specification to the create-mastra project's package.json file. #4214

A new getResources() method to the MCPClient class, enabling clients to retrieve resources from connected MCP servers, updates documentation and tests, and maintains backward compatibility. #4181 [IMPORTANT]
Documentation for the Klavis AI MCP registry. #4201
Ensure that handlers in MCP can only be registered once, preventing duplicate registrations. #4215
Utilize streamSSE for improved server-sent event handling. #4187
Fix MCPClient and MCPServer to handle complex JSON schemas by using the zod-from-json-schema library for in-memory schema conversion, resolving serialization issues with non-serializable schema parts. #4220
Support for passing runtime context to the logger in MCPClient tool calls and includes tests to ensure context isolation between calls and servers. #4230

Fix handling of 'from date' and 'to date' in traces. #4210
Fix Partitioning by 'createdAt' in ClickHouse tables to align with best practices and avoid creating a new partition for each timestamp. #4129

Fix describeIndex function in PGVector to correctly handle custom schemas by checking index existence using both index name and schema instead of just the table name. #4193
Deprecate updateIndexById and deleteIndexById methods in favor of using updateVector and deleteVector. #4192

Fixes tool compatibility to handle both Zod and JSON schemas and cases where no schema is provided. #4188
Handle jsonSchema implementations on Vercel tools. #4200