LangSmith Cloud changelog

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Observability and evaluations

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Automations

• Automations now let you control trace retention per action, so traces matched by a rule can stay at base retention instead of being upgraded.

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Engine

• The Engine issue board now shows a Connect GitHub action when GitHub is not connected, so you can set up pull request creation without leaving the board.
• Engine now has a unified enablement screen with access requests, and organization settings consolidate Engine usage and limits in one place.
• Organization admins now receive Engine spend emails when spend crosses each configured threshold, and pausing or disabling Engine now asks for confirmation.

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Datasets and experiments

• Experiments now show live loading progress in the header and the Progress column, so you can track completed and evaluated runs in real time.
• Evaluators now include a trace-retention toggle in the advanced options, so scored traces can stay at base retention when that fits your workflow.
• Evaluator prompt editing now offers an advanced mode for editing Mustache templates directly with separate variable mappings.
• You can now apply resource tags when creating a dataset, including from scratch, file upload, or a clone.
• Auto-attached Assertions evaluators now read assertions from the reference output, so experiment scores reflect actual pass and fail results.

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Prompts and playground

• OAuth client credentials now support per-workspace setup on model configurations, so workspace admins can self-serve OAuth on saved prompts and models.
• The Playground now exposes a Reasoning Summary option for OpenAI reasoning models on the Responses API.
• The model dropdown no longer suggests OpenAI models for an OpenAI Compatible Endpoint, so you can enter your own custom model name.

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Tracing

• Trace query syntax now has a full operator reference, field table, and quick examples, so API filtering is easier to discover.
• The OpenTelemetry guide now explains how to link spans to an existing LangSmith SDK trace and what happens when a parent span never arrives, so cross-process traces are easier to debug.

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Monitoring and alerting

• Dashboards now include a chart builder with chart templates, a create and edit pane, and brush and series controls on time series charts.
• You can now send alerts to Slack as a native notification target and connect or disconnect the Slack app from the UI.

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Deployment

• Preview deployments now build the image for the preview commit instead of reusing the parent deployment’s image.

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Sandboxes

• Sandbox auth proxy now documents GCP rules and service-account handling, so Google API access through the proxy is clearer.
• Sandboxes now marks AWS US SaaS availability as generally available, so the region table reflects the current rollout.
• Sandboxes now support Git mounts and Google Cloud Storage bucket mounts.

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Admin and billing

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Administration

• Organization settings now clarify that SSO/SCIM group names can omit spaces, so enterprise IdPs that disallow spaces still work cleanly.
• The Vanta MCP integration is now generally available to all workspaces.
• Applying tags when creating datasets, prompts, and projects is now governed by dedicated tag-on-create permissions.

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LLM Gateway

• The LLM gateway now supports native Gemini routes for Vertex AI and the OpenAI embeddings endpoint.
• Gateway guard policies now accept a granular PII configuration and a configurable timeout action.

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Usage and billing

• Granular billable usage now clarifies org scoping, so you can interpret usage totals more accurately.

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Observability and evaluations

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Engine

• Engine now shows only project-level spend in project view, so org-wide spend stays in the org settings surface.
• Engine now keeps the Slack issue-alert deck pinned above the scrolling issues list, so the callout stays visible as you browse.

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Datasets and experiments

• Dashboards now support time series bar and line charts backed by the v2 chart API, so monitored metrics can use the newer chart type.
• Categorical feedback now shows derived percentages in experiment tables, so pass/fail metrics are easier to scan.

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Prompts and playground

• Playground now mints OAuth bearers end to end for OAuth-enabled presets, so long-running batches and streams keep working.

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Sandboxes

• Sandbox auth proxy now supports GCP auth flows, so sandbox workloads can reach Google APIs through the proxy.

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Admin and billing

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Administration

• Organization settings no longer expose the hidden LCU rate-card admin modal or tenantless routes, so rate-card management stays behind the scenes.

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Fixes

• The Engine trial modal no longer shows the rough-math LCU bullet, so the pricing copy is less misleading.

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Observability and evaluations

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Automations

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

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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.

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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.

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Prompts and playground

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

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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

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Deployment

• You can now trigger a LangSmith Deployment from the Studio page.
• LangSmith Deployment now supports deploying Google Agent Development Kit (ADK) agents.

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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.

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Admin and billing

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Administration

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

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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.

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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.