> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-docsop-1783712953-3d6265d.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.
# LangSmith Cloud changelog
> Weekly updates to LangSmith Cloud
Weekly updates to [LangSmith Cloud](/langsmith/observability) and [LangSmith Fleet](/langsmith/fleet).
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If you use self-hosted LangSmith, see the [self-hosted changelog](/langsmith/self-hosted-changelog) for updates.
## Observability and evaluations
### Datasets and experiments
* Model, prompt, and tool chips in the [Experiments](/langsmith/analyze-an-experiment) table config cells now lay out from real measurements for accurate truncation, and the +N overflow badge is a clickable dropdown whose entries expose the same actions (filter, group by, open in playground, and details) as a chip's own menu.
* Expanding the run tree for repetition runs in [experiment comparison](/langsmith/compare-experiment-results) views now works reliably when a repetition root has a `project ID` but no `session ID`.
* [Evaluators](/langsmith/evaluators) linked to Hub prompts now load correctly for flat and playground-shaped prompt commits, fixing crashes when editing existing evaluators.
* Code evaluator upload now accepts Python entrypoints annotated with PEP 604 union return types (for example `-> dict | None`).
* `POST /v2/datasets/{dataset_id}/experiment-runs` is the supported public API for paginated experiment comparison. Legacy dataset comparison helpers are removed from the public OpenAPI spec and generated SDKs; existing HTTP routes continue to work for LangSmith UI clients.
* Each example's dataset splits now render as chips in the dataset Examples table, laid out from real measurements with a clickable +N overflow menu when an example belongs to more splits than fit the column.
* The [experiment comparison](/langsmith/compare-experiment-results) view now offers an optional, reorderable "Splits (latest)" column that shows each example's current dataset split assignments as chips, reflecting live membership rather than the as-of-run snapshot.
* [Evaluators](/langsmith/evaluators) spend charts on project and dataset evaluator tabs keep their desktop layout on narrow screens and scroll horizontally instead of compressing the chart and stat cards.
* The [experiment comparison](/langsmith/compare-experiment-results) and group-by views now show each example's current dataset split rather than the split it had when the experiment ran, so you can tell whether failures already belong to a split without re-running the experiment.
* LangSmith now caps reusable [evaluators](/langsmith/evaluators) per workspace to prevent unbounded resource growth. Contact support if your workspace needs a higher limit.
* Creating [dataset examples](/langsmith/manage-datasets) from [source runs](/langsmith/manage-datasets) now correctly fetches run inputs and outputs backed by SmithDB, and no longer fails the whole request if one of several source runs cannot be found.
* Custom code evaluators that time out or fail on a run now record an error on that run instead of silently leaving it without feedback, so partial evaluation failures are visible on the experiment.
* The Open source run action on an example page now reads session and start time from dedicated example fields populated at creation, enabling reliable navigation to the source trace on SmithDB.
### Tracing
* LangSmith now enforces user-defined monthly trace limits scoped to individual projects and users. New traces that exceed a configured limit are rejected, while patches and feedback for already-accepted traces continue to flow through.
* The tracing and evaluation onboarding quickstarts now show the correct `LANGSMITH_ENDPOINT` for bring-your-own-cloud data plane workspaces instead of the shared multi-tenant endpoint.
* Sharing, viewing, or unsharing any run in a trace now operates on the trace root, so every run in a shared trace is publicly viewable, and public run links open the selected run within the shared trace.
* Projects with existing traces no longer incorrectly display the onboarding screen when filtered or scoped to a time window with no recent runs. The project run-count check now looks back 30 days instead of the previous one-hour window.
* Bulk export compression now defaults to zstandard (zstd) for improved performance. Self-hosted environments retain the gzip default via the `FF_BULK_EXPORT_DEFAULT_COMPRESSION` environment variable.
* LangSmith now returns clearer 409 Conflict messages when duplicate run create or update payloads are submitted. The message indicates whether the duplicate was a run create or run update request when possible.
* LangSmith [MCP tools](/langsmith/langsmith-mcp-server) that fetch runs or thread history now accept `project UUIDs` in addition to project names, making trace URL investigations faster and less error-prone.
* OpenTelemetry resource attributes (set via `OTEL_RESOURCE_ATTRIBUTES`) now appear on traces as metadata namespaced under otel.resource.\*, so you can attach details like user IDs without changing how your tracer emits spans.
* Vercel AI SDK traces sent over raw OpenTelemetry now render in the Messages view. Previously these traces showed an empty Messages tab because no format adapter claimed them.
* Thread stats requests that opt into streaming now return the main stats first and add feedback stats when they are ready.
* When a runs query times out, the runs table now shows a timeout banner for better responsiveness.
* LangSmith now preserves traces in multipart ingestion batches when one run has oversized inputs or outputs. Oversized input and output fields are replaced with a placeholder instead of rejecting the entire batch.
### Engine
* When an Engine project reaches its monthly spend limit, the Next Run status chip and project spend card now show a clear "Monthly spend limit reached" state with a button that takes you straight to raising the limit.
* LangSmith exposes Engine issue listing and retrieval through hosted [MCP tools](/langsmith/langsmith-mcp-server) and generated SDK methods. Agents and API clients can fetch issue details directly by `issue ID` or filter issues by project, status, severity, tag, and update time.
* A new Engine board callout points you to the trace-scope setting, where you can restrict Engine's reviews to runs matching a run name or metadata value.
* Self-hosted Engine deployments can route Anthropic-compatible model calls through Gateway or an LSI-compatible endpoint by setting `ENGINE_ANTHROPIC_BASE_URL`.
### Prompts and playground
* Self-hosted [Playground](/langsmith/playground-model-providers) and evaluator outbound model calls now honor proxy environment variables while preserving SSRF validation on every request.
* When you save a prompt to an application from the playground, LangSmith keeps the workspace application filter on All Applications instead of switching the rest of the UI to that application.
* Typing a workspace member's name or email in the [Context Hub](/langsmith/context-hub) search box now also returns the prompts and resources they created.
* The playground now includes Claude Sonnet 5, Claude Fable 5, and Claude Opus 4.8 in the Anthropic, Bedrock, and Vertex AI model selectors. New Anthropic playground sessions default to Claude Sonnet 5.
### Feedback
* Editing the score on evaluator-generated feedback (for example from the experiment comparison view) now saves correctly instead of failing with "Failed to add feedback correction".
* Adding feedback or reviewer notes from the LangSmith UI no longer upgrades short-lived traces to extended retention. Long-lived traces are unchanged.
* Feedback statistics queries now route through the official ClickHouse client, resolving query failures and improving compatibility with ClickHouse 25.x.
### Monitoring and alerting
* Alert chart previews now handle relative date ranges consistently, preventing failures when loading 14-day or 30-day previews.
* [Dashboards](/langsmith/dashboards) chart tooltips and axes now show up to eight fractional digits (previously two), so very small costs and rates no longer round down to zero.
* Time-series charts on custom dashboards now leave gaps for missing data points instead of plotting them as zero, and lines connect across those gaps so trends remain readable.
### Automations
* Applying a prebuilt evaluator without a filter now defaults to running on root runs only, matching manually created evaluators. Previously it ran on every nested run in a trace.
* Turning an online evaluator or automation on or off now saves for any role that can edit rules, instead of silently reverting for members without the retention-configuration permission.
## Deployment
* Self-hosted deployments can now request CPU and memory above the previous Cloud limits of 8/16 cores and 32/16 GB, bounded only by your cluster capacity. Lower bounds, multiple-of-128 granularity, and Redis memory ordering are still enforced.
* Custom Slack app triggers can now opt in to let third-party bots trigger an agent. Enable the allow bot triggers toggle on a registration to accept events from external bots; echoes from your own and other LangSmith-registered bots are still dropped to prevent loops.
* Agents now skip unreachable or misconfigured non-default MCP servers immediately instead of retrying them, removing a slow round-trip from the tool-loading step and cutting time-to-first-token.
* Standby (uptime) minutes for LangGraph Platform deployments could be billed more than once when replicas reported overlapping intervals across separate usage-reporting runs. Reporting now deduplicates each minute across runs so it is billed at most once.
## Sandboxes
* Sandbox command output is now re-chunked into bounded single WebSocket frames, so clients that do not reassemble continuation frames (including the Go SDK) can read large streamed or replayed output without truncated JSON.
* S3 sandbox mounts now default `endpoint_url` to [https://s3.amazonaws.com](https://s3.amazonaws.com) when it is not provided, so the field is no longer required when mounting standard AWS S3 buckets.
* [Sandboxes](/langsmith/sandboxes) can now burst CPU up to 2x their requested allocation when the host has spare capacity, and you can request fractional (sub-core) vCPU down to 0.05.
* When creating a sandbox, you can now configure Git, S3, and GCS filesystem mounts, including mount paths, Git remotes, bucket settings, and cache options. Configured mounts appear in the sandbox table and detail view.
* The LangSmith SDKs now support creating, listing, updating, and deleting sandbox registries for pulling private container images, alongside the existing sandbox and snapshot operations.
* Sandbox snapshot builds can now request an XFS root filesystem for sandbox-host based environments.
* Sandbox creation no longer fails intermittently with "sandbox not ready" errors when an underlying host is disrupted. Affected capacity now retries the contended resource lock and recovers automatically instead of leaving the pool degraded.
* Sandbox host startup now validates the full version directory before reuse, so a missing initrd no longer causes create-time failures after a partial or stale install.
* Creating a sandbox snapshot from a Docker image now records the image's tag (e.g. ubuntu:24.04 becomes the 24.04 tag), and creating a sandbox from a snapshot name without a tag resolves the latest tag, mirroring Docker.
* Self-hosted LangSmith installations now show the [Sandboxes](/langsmith/sandboxes) navigation item and use the instance-level sandbox flag to open the Sandboxes page.
## Administration
* A new Project and user limits tab on the enterprise Usage configuration page lets you set monthly trace-count limits scoped to a specific project or user. Add, edit, and delete limits from the page.
* Anonymous organizations now show an "Anonymity mode is on" banner on the members page, and the usage breakdown hides the group-by-user option for non-internal viewers.
* New API keys now default to a finite expiration date instead of requiring a custom value. When an organization enforces a shorter maximum, the form defaults to that maximum instead.
* You can now fetch a single workspace directly via GET /api/v1/workspaces/{workspace_id} instead of listing all workspaces and filtering client-side.
* Org and workspace admins can now edit the role of a pending member invite directly from the Members settings page, without needing to cancel and re-send the invite.
* The Usage limits page now shows each workspace's configured total and extended (long-lived) trace limits, including caps that were previously hidden while the spend limit displayed "Unlimited".
* The batch workspace invite endpoint no longer returns a 409 error when inviting users who are already pending org invitees or active org members. Those users are added directly to the workspace without requiring a new org invite.
* The role selector in the edit pending member invite dialog now uses a scrollable select, matching the invite flow. This ensures all custom roles are accessible when many workspace roles are defined.
* Self-hosted deployments can now encode spaces in the OIDC authorization request as %20 instead of +, so single sign-on works with identity providers that reject the default + encoding of the scope list. Enable it by setting OAUTH\_URL\_ENCODE\_SCOPE\_SPACES=true.
* Billing upgrade dialogs now stay within the viewport and scroll when payment or business details make the form taller than the screen.
* Non-admin callers with manage-members permission can no longer assign restricted roles to workspace members or invite users with restricted roles to the workspace.
* Filter the organization's service keys and personal access tokens by workspace on the API keys settings page.
* Users without workspaces:manage permission cannot use restricted roles for invites, role changes, or user deletions in the UI.
* Adding existing active or pending organization members to a workspace no longer fails when organization-level invites are disabled. Disabled org invites continue to block new organization invitees.
* The Roles settings page now scrolls correctly when an organization has more roles than fit on screen.
* Organization admins can once again edit the role of and remove other organization admins from the Organization Members settings page. Organization Operators, who share the same admin-level permissions but should not manage other admins, are now correctly prevented from editing, removing, or promoting members to Organization Admin.
### LLM Gateway
* LLM gateway data protection policies can now configure whether a guard pipeline timeout allows the request through or blocks it. Existing policies default to allowing requests on timeout.
* The LLM gateway now supports POST /openai/v1/responses/compact (and the legacy /responses/compact), routing it through the chat-shape responses handler.
* Guard policies now let you choose which PII rule categories to detect, with separate faster rule-based and slower model-based detection options, instead of a single on/off PII toggle.
* Gateway guard secret redaction now detects additional token formats, including SendGrid API tokens, Google OAuth access tokens, JWTs, Slack webhook URLs, and legacy LangSmith keys.
* The [LLM Gateway](/langsmith/llm-gateway) policies page now lets you sort each section by spend limit or usage percentage, and filter down to a specific workspace, user, or API key.
## Observability and evaluations
### Automations
* [Automations](/langsmith/rules) now let you control trace retention per action, so traces matched by a rule can stay at base retention instead of being upgraded.
### Engine
* The [Engine](/langsmith/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](/langsmith/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](/langsmith/engine) spend emails when spend crosses each configured threshold, and pausing or disabling Engine now asks for confirmation.
### Datasets and experiments
* [Experiments](/langsmith/analyze-an-experiment) now show live loading progress in the header and the Progress column, so you can track completed and evaluated runs in real time.
* [Evaluators](/langsmith/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](/langsmith/evaluators) 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](/langsmith/manage-datasets), including from scratch, file upload, or a clone.
* Auto-attached Assertions [evaluators](/langsmith/evaluators) now read assertions from the reference output, so experiment scores reflect actual pass and fail results.
### Prompts and playground
* [OAuth client credentials](/langsmith/model-configurations#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](/langsmith/playground-model-providers) 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](/langsmith/model-configurations).
### Tracing
* [Trace query syntax](/langsmith/trace-query-syntax) now has a full operator reference, field table, and quick examples, so API filtering is easier to discover.
* The [OpenTelemetry guide](/langsmith/trace-with-opentelemetry) 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.
### Monitoring and alerting
* [Dashboards](/langsmith/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](/langsmith/alerts) to Slack as a native notification target and connect or disconnect the Slack app from the UI.
## Deployment
* Preview [deployments](/langsmith/deployment) now build the image for the preview commit instead of reusing the parent deployment's image.
## Sandboxes
* [Sandbox auth proxy](/langsmith/sandbox-auth-proxy) now documents GCP rules and service-account handling, so Google API access through the proxy is clearer.
* [Sandboxes](/langsmith/sandboxes) now marks AWS US SaaS availability as generally available, so the region table reflects the current rollout.
* [Sandboxes](/langsmith/sandboxes) now support Git mounts and Google Cloud Storage bucket mounts.
## Admin and billing
### Administration
* [Organization settings](/langsmith/administration-overview) 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](/langsmith/administration-overview).
### LLM Gateway
* The [LLM gateway](/langsmith/llm-gateway) now supports native Gemini routes for Vertex AI and the OpenAI embeddings endpoint.
* [Gateway guard](/langsmith/llm-gateway) policies now accept a granular PII configuration and a configurable timeout action.
### Usage and billing
* [Granular billable usage](/langsmith/granular-usage) now clarifies org scoping, so you can interpret usage totals more accurately.
## Observability and evaluations
### Engine
* [Engine](/langsmith/engine) now shows only project-level spend in project view, so org-wide spend stays in the org settings surface.
* [Engine](/langsmith/engine) now keeps the Slack issue-alert deck pinned above the scrolling issues list, so the callout stays visible as you browse.
### Datasets and experiments
The experiments table now displays loading progress bars showing the number of runs completed and evaluated, and experiments that predate this feature show a placeholder progress bar.
* [Dashboards](/langsmith/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.
### Prompts and playground
* [Playground](/langsmith/playground-model-providers) now mints OAuth bearers end to end for OAuth-enabled presets, so long-running batches and streams keep working.
## Sandboxes
* [Sandbox auth proxy](/langsmith/sandbox-auth-proxy) now supports GCP auth flows, so sandbox workloads can reach Google APIs through the proxy.
## Fixes
* The Engine trial modal no longer shows the rough-math LCU bullet, so the pricing copy is less misleading.
## Observability and evaluations
### Automations
* [Run rule](/langsmith/rules) 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](/langsmith/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](/langsmith/engine-webhooks) 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](/langsmith/assertions) 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](/langsmith/compare-experiment-results), and global experiments tables.
### Prompts and playground
* The [Playground](/langsmith/playground-model-providers) supports Amazon Bedrock API key authentication, letting you authenticate with a bearer token instead of AWS credentials.
### Tracing
* The [trace view](/langsmith/view-traces) 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](/langsmith/studio) page.
* LangSmith Deployment now supports [deploying Google Agent Development Kit (ADK) agents](/langsmith/deploy-google-adk).
## Sandboxes
* [Sandbox proxy rules](/langsmith/sandbox-auth-proxy) now support configuring AWS authentication, so sandboxes can reach AWS services through the proxy with signed requests.
* Sandboxes can create [snapshots](/langsmith/sandbox-snapshots) from a Dockerfile build source.
## Admin and billing
### Administration
* Organization admins can now disable personal access token creation from the [organization settings](/langsmith/administration-overview) page.
### Usage and billing
* [Granular billable usage](/langsmith/granular-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.
## Observability and evaluations
### Insights
* The [Insights Agent](/langsmith/insights) now supports scheduled reports on daily, weekly, or custom cron intervals, so report generation runs without manual triggering. Time ranges compute dynamically, so a "last 24 hours" report always reflects the most recent window when it runs, not when you configured it.
### Datasets and experiments
* You can now pin any experiment as a baseline. The pinned experiment stays at the top of the [Experiments](/langsmith/compare-experiment-results) view and serves as the automatic comparison point for later runs, surfacing performance deltas across every column so improvements and regressions are immediately clear.
## Observability and evaluations
### Cost tracking
* [Cost tracking](/langsmith/cost-tracking) now extends beyond LLM calls. Submit custom cost metadata for any run, such as an expensive tool call, a third-party API, or a retrieval step, to monitor, debug, and optimize spend across your entire agent stack from a single dashboard.
### Tracing
* You can now [configure which parts of a trace's inputs and outputs](/langsmith/configure-input-output-preview) appear in the tracing table, so teams working with custom trace formats can surface the most relevant fields, reduce clutter, and identify traces that need a closer look faster.
## Observability and evaluations
### Annotation and human feedback
* New pairwise [annotation queues](/langsmith/annotation-queues) let reviewers compare two runs side by side and choose whether option A is better, option B is better, or the two are equal across rubric items. LangSmith automatically pairs runs between two experiments and manages queues, reviewer assignments, and trace access, so you can run A/B evaluations across agents, prompts, and models, including for subjective dimensions like tone, correctness, usefulness, or style.
## Observability and evaluations
### Tracing
* LangSmith Fetch, a new command-line tool, brings LangSmith traces directly into your terminal, coding environment, or IDE. Install it with `pip install langsmith-fetch`, then retrieve traces with filters such as `--limit`, `--after`, and `--last-n-minutes`, or bulk-export traces and threads to files for analysis, scripting, or dataset creation.
## Observability and evaluations
### Cost tracking
* [Cost tracking](/langsmith/cost-tracking) now automatically records token usage and derived costs for major model providers, and you can submit custom cost data for tools, retrieval steps, and other operations. Costs appear across trace trees, project stats, and dashboards, with an editable price map for non-standard pricing.
## Admin and billing
### Administration
* LangSmith is now on the Okta Integration Network, so enterprise teams can provision and deprovision users with SCIM and configure SSO through Okta's guided setup. See the [administration overview](/langsmith/administration-overview) for access control options.
## Observability and evaluations
### Insights
* The [Insights Agent](/langsmith/insights) is now generally available for Plus and Enterprise plans. It analyzes production traces to surface usage patterns, agent behaviors, and failure modes, with usage-pattern clustering, poor-interaction analysis, and custom grouping and filtering.
### Datasets and experiments
* [Multi-turn evals](/langsmith/online-evaluations-multi-turn) measure end-to-end agent conversations across multiple exchanges, scoring semantic intent, semantic outcomes, and agent trajectory, including tool calls and decisions.
## Observability and evaluations
### Datasets and experiments
* [Dataset creation](/langsmith/manage-datasets) now infers schema automatically from uploaded CSV and JSONL files, supports adding metadata fields during upload, supports column mapping and renaming, and supports bulk additions to existing datasets from new uploads.
## Deployment
* LangGraph Platform is now [LangSmith Deployment](/langsmith/deployment) and LangGraph Studio is now [LangSmith Studio](/langsmith/studio). LangSmith now spans three services: Observability, Evaluation, and Deployment. Existing deployments, APIs, workflows, pricing, and contracts are unchanged, and no action is required.
## Observability and evaluations
### Datasets and experiments
* You can now write custom code [evaluators](/langsmith/evaluators) in JavaScript in addition to Python, so TypeScript teams can stay in their ecosystem end to end.
## Observability and evaluations
### Datasets and experiments
* [Composite evaluators](/langsmith/online-evaluations-composite) combine multiple evaluator scores into a single metric using a weighted average or weighted sum, with customizable weights.
## Admin and billing
### Administration
* You can now create service keys at the [organization level](/langsmith/administration-overview), scoped to multiple workspaces or the entire organization, and assign roles, including custom roles, for granular permissions.
## Deployment
* [LangSmith Deployment](/langsmith/deployment) now queues revisions automatically, processing each new revision only after the current one finishes to prevent overlapping deployments and conflicts.
## Deployment
* [Studio](/langsmith/studio) now includes Trace Mode, which shows your LangSmith traces directly in Studio and supports annotating runs and adding them to datasets for evaluation.
## Observability and evaluations
### Datasets and experiments
* Align Evals provides a playground-like interface for iterating on [evaluator](/langsmith/evaluators) prompts and comparing human-graded scores side by side with LLM-generated scores to surface misaligned cases.
## Deployment
* LangSmith now links traces to the server logs in [LangSmith Deployment](/langsmith/deployment), so you can open user and system logs directly from a trace.
## Observability and evaluations
### Tracing
* [Data export](/langsmith/data-export) now supports scheduled exports of traces, so external systems such as data warehouses, monitoring platforms, and dashboards stay in sync without custom infrastructure.
## Deployment
* A new Monitoring tab shows [deployment](/langsmith/deployment) metrics, including CPU and memory usage, API request latency, and active run counts, over a customizable time range.
## Observability and evaluations
### Datasets and experiments
* You can now create custom views of [evaluation results](/langsmith/analyze-an-experiment) by breaking fields from inputs, outputs, and reference outputs into their own columns, hiding or reordering columns, and adjusting decimal precision on feedback scores.
## Admin and billing
### Administration
* LangSmith [API keys](/langsmith/administration-overview) now support expiration dates, so you can scope access for temporary tasks or team members.
## Observability and evaluations
### Prompts and playground
* The [Playground](/langsmith/playground-model-providers) now supports calling built-in tools from OpenAI and Anthropic, such as web search and MCP, so you can verify tool selection and argument passing.
## Deployment
* [Studio](/langsmith/studio) now lets you run agent evaluations in the UI without code, comparing against reference outputs and grading responses with custom criteria.
## Observability and evaluations
### Cost tracking
* [Cost tracking](/langsmith/cost-tracking) now accounts for cached tokens, multiple token modalities such as text and image, and reasoning tokens, and supports tracking costs for arbitrary token types.
## Observability and evaluations
### Prompts and playground
* [Prompts](/langsmith/prompt-engineering) now support webhook triggers that sync a prompt to external systems such as GitHub, databases, or CI/CD pipelines when it is updated.
## Deployment
* Every agent deployed on [LangSmith](/langsmith/deployment) now exposes its own Model Context Protocol (MCP) endpoint, so the agent can be used as a tool in any client that supports streamable HTTP for MCP, with no custom code or infrastructure.
## Admin and billing
### Usage and billing
* SaaS customers can now view monthly [usage charts](/langsmith/granular-usage) that track all billable metrics in one place.
## Observability and evaluations
### Monitoring and alerting
* [Agent observability](/langsmith/observability) surfaces tool calls and run stats, including the most-used tools and runs, their latency, and which generate the most errors.
## Deployment
* LangGraph Platform, now [LangSmith Deployment](/langsmith/deployment), reached general availability for deploying and managing long-running, stateful agents at scale, with one-click GitHub-to-production deployment, integrated memory and persistence, scalable APIs, and an agent registry across cloud, hybrid, self-hosted, and developer deployment options.
* [Studio](/langsmith/studio) v2 runs locally without the desktop app, supports editing prompts and configuration in the UI, integrates with the Playground, and lets you download production traces to debug them locally.
## Observability and evaluations
### Tracing
* LangSmith now supports [multimodal content](/langsmith/log-multimodal-traces) for images, PDFs, and audio across the playground, annotation queues, and datasets, including attaching files to dataset examples without base64 encoding and visualizing the content in the app.
## Observability and evaluations
### Monitoring and alerting
* [Alerts](/langsmith/alerts) send real-time notifications on error rates, run latency, and feedback scores, so you can catch production failures proactively.
## Observability and evaluations
### Prompts and playground
* The [Playground](/langsmith/playground-model-providers) now lets you create datasets inline and add examples to existing datasets without leaving the Playground.
## Observability and evaluations
### Tracing
* LangSmith now has end-to-end native [OpenTelemetry support](/langsmith/trace-with-opentelemetry) for LangChain and LangGraph applications, including distributed tracing across microservices.
### Datasets and experiments
* You can now define [evaluators](/langsmith/evaluators) for datasets and tracing projects directly in the UI with no code, including LLM-as-a-judge evaluators with prebuilt templates, customizable prompts, variable mapping, scoring, and few-shot support.
## Deployment
* [Studio](/langsmith/studio) now lets you view and edit node logic in the UI by tagging configuration fields with `langgraph_nodes`, edit prompts without code changes, and sync Playground experiments back to the graph.
## Observability and evaluations
### Tracing
* LangSmith now supports tracing [OpenAI Agents SDK](/langsmith/trace-with-openai-agents-sdk) applications with two lines of code, for step-by-step observability of agent execution and reasoning.
### Datasets and experiments
* You can now rename an [experiment](/langsmith/analyze-an-experiment) in the UI, either from the Playground table header after a run or with the pencil icon in the Experiments view.
## Observability and evaluations
### Datasets and experiments
* You can now group [experiment results](/langsmith/analyze-an-experiment) by metadata to analyze evaluation performance across segments such as user groups or subject areas.
## Fixes
* A new ingest-backend service separates trace ingestion from frontend request handling, improving average request processing and high-traffic response times.
## Observability and evaluations
### Prompts and playground
* The [Playground](/langsmith/playground-model-providers) can now use workspace secrets saved in LangSmith, for consistent credential management across environments.
## Observability and evaluations
### Datasets and experiments
* A new [experiment view](/langsmith/analyze-an-experiment) gives each feedback key its own column and adds filtering, sorting, and a heat map to spot patterns and performance areas.
## Deployment
* You can now open LLM runs from [Studio](/langsmith/studio) in the LangSmith Playground for debugging, visualization, and prompt experimentation within threads.
## Observability and evaluations
### Tracing
* [Traces](/langsmith/view-traces) now include a waterfall graph that highlights latency bottlenecks and shows which components run in parallel versus sequentially.
## Observability and evaluations
### Prompts and playground
* The [Playground](/langsmith/playground-model-providers) adds a streamlined prompt settings UI, a default model configuration, an enhanced tool management modal, and improved side-by-side comparison.
### Datasets and experiments
* New [Pytest and Vitest integrations](/langsmith/pytest) let you run evaluations using familiar testing frameworks, with debugging, metrics tracking, and built-in evaluation functions.
## New features
* The Access Profiles dialog in chat now includes a Create an [access profile](/langsmith/fleet/computer-use) link that opens the sandboxes create flow, so you can add a profile when a workspace has none configured instead of hitting a dead end.
* Fleet agents can now delete files from their memory and [skills](/langsmith/fleet/skills) using the new delete tool, including files in linked workspace skills. Core agent files and read-only system skills remain protected.
* Fleet now completes OAuth for [MCP servers](/langsmith/fleet/remote-mcp-servers) whose authorization server requires client-secret authentication at the token endpoint, so connecting these servers no longer fails after the consent step.
* First-time Fleet users now see a streamlined welcome modal with two clear paths — describe an agent to build with AI (starting from a prompt in Chat) or start from a curated template — replacing the previous multi-step setup wizard.
* Creating an agent from a Fleet [template](/langsmith/fleet/templates) now skips the setup wizard and opens the agent editor with the template onboarding card.
* Fleet now sends the MCP protocol version a server negotiates during the handshake, both when loading tools and when the agent calls them, so [MCP servers](/langsmith/fleet/remote-mcp-servers) that require a newer version no longer return zero tools or fail tool calls.
* Fleet agents receive the day of week alongside the current date (for example "Monday, June 29th 2026"), so scheduling and date reasoning no longer relies on the model inferring the weekday from the ISO date.
* File edits in Fleet agent chat now render as syntax-highlighted, line-by-line diffs, making changes easier to review.
* When you connect a custom Slack bot to a Fleet agent, Fleet sends the installer a direct message with quick setup tips, including how to add the bot to channels and mention it with @.
* Fleet agents now have a Slack tool for listing channels the connected bot is a member of, making it easier to discover the right channel before posting or reading messages.
* Fleet OAuth provider and integration responses now include an `owner` field (`workspace` or `platform`) so you can tell your own resources apart from built-in, platform-managed ones. The platform manager organization can now create and modify built-in OAuth providers.
* Setting up a schedule is now clearer: choose a preset (daily, weekly, monthly, or every few minutes) or enter a custom cron expression, with a live human-readable preview and inline validation as you go.
* When registering an integration OAuth provider for headless connections, `http://` redirect URIs are now accepted only for the loopback IP literals `127.0.0.1` or `[::1]`. The localhost hostname is no longer accepted over http — use the loopback IP literal or https.
## Fixes
* On the Agent Builder [Integrations](/langsmith/fleet/tools) page, searching now selects the All tab so results span every category, and switching category tabs clears the search.
* When a Fleet agent's subagent calls a tool that requires human approval, the approval prompt now appears in the chat instead of the run completing without it.
## New features
* [Fleet tools](/langsmith/fleet/tools) now include Salesforce OAuth provider setup for self-hosted users, so you can configure the provider end to end.
* Agent sharing is redesigned around two choices, who can use and who can edit an agent, plus a Publish as template option that lets others fork their own editable copy.
* Fleet agents now post a notification to the originating thread, such as Slack, when they pause at a human-in-the-loop interrupt, with a link back to the agent chat.
* You can now complete Fleet integration OAuth through your own callback URL, so headless setups can finish authentication without the LangSmith UI.
* Agent cards now show the agent owner.
* New first-party [templates](/langsmith/fleet/templates), Brand Copywriter and Applicant Screening, are available in the gallery.
## Fixes
* Switching threads in the agent chat now clears the previous thread immediately and shows a loading state instead of stale messages.
* The [skills](/langsmith/fleet/skills) list now degrades gracefully when one skill fails to load, so the remaining skills still appear.
## New features
* [Templates](/langsmith/fleet/templates) now show “by Fleet” with the Fleet logo, so curated templates match Fleet branding.
## Fixes
* The Fleet list-threads endpoint now returns `items` instead of `threads`, so the response shape matches the rest of the API.
* Fleet thread requests now return a clearer error when a large response would have triggered a 5xx, so long lists fail gracefully.
## New features
* [Skills](/langsmith/fleet/skills) load faster: the skills list fetches lightweight metadata first and loads file contents only when you open a skill.
* The agent creation menu adds a [Templates](/langsmith/fleet/templates) entry.
* The [remote MCP](/langsmith/fleet/remote-mcp-servers) authorization screen now shows the connecting application's name, logo, and homepage, terms, and privacy links instead of its raw `client ID`.
* [Slack integration](/langsmith/fleet/slack-app) available in AWS and APAC regions.
## Fixes
* [Scheduled (cron) execution](/langsmith/fleet/schedules) is restored for enterprise Fleet agents.
* Long-running agent runs and agent-builder generations are no longer cut off after 60 seconds.
* The Gmail read-emails [tool](/langsmith/fleet/tools) now returns results when you search sent mail with an `in:sent` query.
* Scrolling is improved for long toolbox, skill, and sub-agent lists in the agent editor, and webhook dialogs now scroll within the viewport.
## New features
* Agent Builder is now [LangSmith Fleet](/langsmith/fleet). The new name reflects Fleet's focus on building and managing agents for your whole team: creating them, sharing them, managing their tasks, and controlling agent access and identity. All existing agents, configurations, integrations, plans, and contracts continue to work unchanged, with no action required on your end.
## New features
* A central Chat agent connects to all of your workspace [tools](/langsmith/fleet/tools), including Slack, Gmail, Linear, and MCP servers, so you can ask questions and take actions without setting up a dedicated agent first.
* Turn a useful conversation into a recurring agent with one click, with no prompt engineering or conditional logic required.
* Upload files directly into chat, including CSVs, images, documents, and style guides, for the agent to act on immediately.
* A central tool registry lets workspace admins connect [tools](/langsmith/fleet/tools), manage authentication, and control access across the organization.
## New features
* LangSmith Agent Builder launched in private preview as a no-code way for non-developers to build agents, with conversational setup, built-in memory, MCP integrations, automated triggers, and subagent support. Agent Builder later became [LangSmith Fleet](/langsmith/fleet).
***
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