Engine spend GA; Assertions evaluator ships; Bedrock auth support

Observability and evaluations

Automations

• Run rule webhook payloads now include a trace deep link for each run, so downstream systems can jump straight back to the trace.

Engine

• Per-workspace Engine spend is now generally available: you can view LCU and USD spend directly on the Engine settings page, including session-level spend.

• The Engine settings page now surfaces additional Engine details in one place.

• You can rotate Engine issue-board webhook signing secrets from both the API and the webhook settings UI.

• The Engine issues list adds a sort option by trace count.

Datasets and experiments

• A new out-of-the-box Assertions evaluator scores outputs against an explicit list of criteria specified in the reference output, and an Assertions rule is auto-attached when you add assertion-style examples to a dataset.

• Evaluator metrics are improved in the experiment detail, comparison, and global experiments tables.

Prompts and playground

• The Playground supports Amazon Bedrock API key authentication, letting you authenticate with a bearer token instead of AWS credentials.

Tracing

• The trace view now shows an unread indicator on a run’s actions menu when the run has reviewer notes you have not seen yet.

• The waterfall view is now full-height with sticky turn headers, so you keep your place while scrolling through long traces.

• Global search now includes context and sandboxes

Deployment

• You can now trigger a LangSmith Deployment from the Studio page.

• LangSmith Deployment now supports deploying Google Agent Development Kit (ADK) agents.

Sandboxes

• Sandbox proxy rules now support configuring AWS authentication, so sandboxes can reach AWS services through the proxy with signed requests.

• Sandboxes can create snapshots from a Dockerfile build source.

Admin and billing

Administration

• Organization admins can now disable personal access token creation from the organization settings page.

Usage and billing

• Granular billable usage now supports filtering and grouping by retention tier, separating long-lived from short-lived traces.

• The Granular Billable Usage page now surfaces LangSmith Deployment usage, including nodes executed, agent runs, and agent uptime, alongside trace usage.

Fixes

• Performance improvements for the loading of large traces.

• Filter values for metadata are now preserved when you reopen a filter dropdown to edit it.

• Dataset creation now uses a multi-select dropdown for choosing CSV fields.