langgraph/docs/docs/cloud/reference/langgraph_server_changelog.md

LangGraph Server Changelog

LangGraph Server is an API platform for creating and managing agent-based applications. It provides built-in persistence, a task queue, and supports deploying, configuring, and running assistants (agentic workflows) at scale. This changelog documents all notable updates, features, and fixes to LangGraph Server releases.

---

v0.2.66 (2025-06-26)

• Fixed a 404 error when creating multiple runs with the same thread_id using on_not_exist="create".

v0.2.65 (2025-06-25)

• Ensured that only fields from assistant_versions are returned when necessary.
• Ensured consistent data types for in-memory and PostgreSQL users, improving internal authentication handling.

v0.2.64 (2025-06-24)

• Added descriptions to version entries for better clarity.

v0.2.62 (2025-06-23)

• Improved user handling for custom authentication in the JS Studio.
• Added Prometheus-format run statistics to the metrics endpoint for better monitoring.
• Added run statistics in Prometheus format to the metrics endpoint.

v0.2.61 (2025-06-20)

• Set a maximum idle time for Redis connections to prevent unnecessary open connections.

v0.2.60 (2025-06-20)

• Enhanced error logging to include traceback details for dictionary operations.
• Added a /metrics endpoint to expose queue worker metrics for monitoring.

v0.2.57 (2025-06-18)

• Removed CancelledError from retriable exceptions to allow local interrupts while maintaining retriability for workers.
• Introduced middleware to gracefully shut down the server after completing in-flight requests upon receiving a SIGINT.
• Reduced metadata stored in checkpoint to only include necessary information.
• Improved error handling in join runs to return error details when present.

v0.2.56 (2025-06-17)

• Improved application stability by adding a handler for SIGTERM signals.

v0.2.55 (2025-06-17)

• Improved the handling of cancellations in the queue entrypoint.
• Improved cancellation handling in the queue entry point.

v0.2.54 (2025-06-16)

• Enhanced error message for LuaLock timeout during license validation.
• Fixed the $contains filter in custom auth by requiring an explicit ::text cast and updated tests accordingly.
• Ensured project and tenant IDs are formatted as UUIDs for consistency.

v0.2.53 (2025-06-13)

• Resolved a timing issue to ensure the queue starts only after the graph is registered.
• Improved performance by setting thread and run status in a single query and enhanced error handling during checkpoint writes.
• Reduced the default background grace period to 3 minutes.

v0.2.52 (2025-06-12)

• Now logging expected graphs when one is omitted to improve traceability.
• Implemented a time-to-live (TTL) feature for resumable streams.
• Improved query efficiency and consistency by adding a unique index and optimizing row locking.

v0.2.51 (2025-06-12)

• Handled CancelledError by marking tasks as ready to retry, improving error management in worker processes.
• Added LG API version and request ID to metadata and logs for better tracking.
• Added LG API version and request ID to metadata and logs to improve traceability.
• Improved database performance by creating indexes concurrently.
• Ensured postgres write is committed only after the Redis running marker is set to prevent race conditions.
• Enhanced query efficiency and reliability by adding a unique index on thread_id/running, optimizing row locks, and ensuring deterministic run selection.
• Resolved a race condition by ensuring Postgres updates only occur after the Redis running marker is set.

v0.2.46 (2025-06-07)

• Introduced a new connection for each operation while preserving transaction characteristics in Threads state update() and bulk() commands.

v0.2.45 (2025-06-05)

• Enhanced streaming feature by incorporating tracing contexts.
• Removed an unnecessary query from the Crons.search function.
• Resolved connection reuse issue when scheduling next run for multiple cron jobs.
• Removed an unnecessary query in the Crons.search function to improve efficiency.
• Resolved an issue with scheduling the next cron run by improving connection reuse.

v0.2.44 (2025-06-04)

• Enhanced the worker logic to exit the pipeline before continuing when the Redis message limit is reached.
• Introduced a ceiling for Redis message size with an option to skip messages larger than 128 MB for improved performance.
• Ensured the pipeline always closes properly to prevent resource leaks.

v0.2.43 (2025-06-04)

• Improved performance by omitting logs in metadata calls and ensuring output schema compliance in value streaming.
• Ensured the connection is properly closed after use.
• Aligned output format to strictly adhere to the specified schema.
• Stopped sending internal logs in metadata requests to improve privacy.

v0.2.42 (2025-06-04)

• Added timestamps to track the start and end of a request's run.
• Added tracer information to the configuration settings.
• Added support for streaming with tracing contexts.

v0.2.41 (2025-06-03)

• Added locking mechanism to prevent errors in pipelined executions.