--- title: "LangSmith API changes, deprecations and deadlines | Harbyn" description: "LangSmith: 0 upcoming deadlines and 60 recorded changes as of 2026-10-25, each with its source." canonical: "https://harbyn.com/vendors/langsmith" last-updated: 2026-10-25 --- # LangSmith: API changes and deadlines Markdown version of . AI models and APIs. 0 upcoming deadlines, 60 recorded changes. Every entry cites the LangSmith page we read it from. ## What we read The LangSmith pages and feeds our ingestion visits, politely and on a schedule. - **Changelog**: - **Changelog**: ## What the scanner looks for How `harbyn scan` recognises LangSmith in a repository, on your machine. Nothing leaves it. - **Packages**: `npm langsmith`, `pypi langsmith` ## Upcoming deadlines No upcoming LangSmith deadline in the feed right now. ## Change history Newest first, by the date LangSmith announced it. This is the archive: past changes are not warnings, and changes we recorded after they took effect are marked as such. ### October 2026 - Oct 21, 2026, Behavior change: [A2A SendMessage supports non-blocking configuration](https://harbyn.com/changes/langsmith/2026-10-21-a2a-sendmessage-supports-non-blocking-configuration.md) - Oct 21, 2026, Feature: [Agent Auth supports GitHub Apps](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Agent list sorting and creation timestamps](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Anthropic Compatible Endpoint support](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Azure Foundry supports Entra ID service principal authentication](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [BYOC sandboxes can use the full node](https://harbyn.com/changes/langsmith/2026-10-21-byoc-sandboxes-can-use-the-full-node.md) - Oct 21, 2026, Feature: [Configure Slack Apps for self-hosted and BYOC installations](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [Context Hub webhook limit removed](https://harbyn.com/changes/langsmith/2026-10-21-context-hub-webhook-limit-removed.md) - Oct 21, 2026, Feature: [Create and delete Azure data planes through the API](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Create GCP BYOC data planes through the API](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [Engine permissions are split](https://harbyn.com/changes/langsmith/2026-10-21-engine-permissions-are-split.md) - Oct 21, 2026, Behavior change: [Engine pull requests are ready for review](https://harbyn.com/changes/langsmith/2026-10-21-engine-pull-requests-are-ready-for-review.md) - Oct 21, 2026, Feature: [Filter runs and traces by feedback modification time](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [Gateway cache keys populate session tags](https://harbyn.com/changes/langsmith/2026-10-21-gateway-cache-keys-populate-session-tags.md) - Oct 21, 2026, Feature: [Gemini 4 Argon and jev-1.14.0 available in gateway configurations](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [IdP-synced teams use matching SCIM and SSO groups](https://harbyn.com/changes/langsmith/2026-10-21-idp-synced-teams-use-matching-scim-and-sso-groups.md) - Oct 21, 2026, Behavior change: [Live migration for running sandboxes](https://harbyn.com/changes/langsmith/2026-10-21-live-migration-for-running-sandboxes.md) - Oct 21, 2026, Feature: [MCP endpoint supports revision 2026-07-28](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [MCP tool results and errors return clearer responses](https://harbyn.com/changes/langsmith/2026-10-21-mcp-tool-results-and-errors-return-clearer-responses.md) - Oct 21, 2026, Behavior change: [OpenTelemetry cached input and reasoning tokens are recorded](https://harbyn.com/changes/langsmith/2026-10-21-opentelemetry-cached-input-and-reasoning-tokens-are-recorded.md) - Oct 21, 2026, Feature: [Rank grouped metric results by total cost](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [Responses report the model that served the request](https://harbyn.com/changes/langsmith/2026-10-21-responses-report-the-model-that-served-the-request.md) - Oct 21, 2026, Feature: [Sandbox cloud workload identity and Azure Blob mounts](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Sandbox command history in GCP production regions](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Sandboxes available to Azure production organizations](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [ScaleDown in LLM Gateway](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Send OpenTelemetry traces to Agent environments](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Trace messages include prompt cache breakdowns](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Tracing-only API keys](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [TypeSafe configurations can use the entered endpoint URL](https://harbyn.com/changes/langsmith/2026-10-21-typesafe-configurations-can-use-the-entered-endpoint-url.md) - Oct 21, 2026, Feature: [Webhook destinations report delivery status](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Behavior change: [Webhook retries stop after prolonged delivery failures](https://harbyn.com/changes/langsmith/2026-10-21-webhook-retries-stop-after-prolonged-delivery-failures.md) - Oct 21, 2026, Feature: [Workspace secrets support allowed hosts through the API](https://docs.langchain.com/langsmith/changelog) - Oct 21, 2026, Feature: [Writable S3 mounts support customer-managed KMS encryption](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Feature: [Agent Auth provides GitHub App installation tokens](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Behavior change: [Agent list cursors from before the ordering change are rejected](https://harbyn.com/changes/langsmith/2026-10-14-agent-list-cursors-from-before-the-ordering-change-are-rejected.md) - Oct 14, 2026, Policy: [Bulk export partitions are billed by uncompressed bytes](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Behavior change: [Cancelled runs expose a cancellation reason](https://harbyn.com/changes/langsmith/2026-10-14-cancelled-runs-expose-a-cancellation-reason.md) - Oct 14, 2026, Behavior change: [Deployment log requests read at most five backend pages](https://harbyn.com/changes/langsmith/2026-10-14-deployment-log-requests-read-at-most-five-backend-pages.md) - Oct 14, 2026, Feature: [Deployment repository can be changed without creating a new deployment](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Policy: [Enterprise and self-hosted traces receive flat LSU pricing](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Feature: [Hosted LangSmith MCP accepts LangSmith API access tokens](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Feature: [Insights category and subcategory endpoints added](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Feature: [Managed tools OpenAPI spec available in production](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Behavior change: [MCP tunnel requests preserve authentication headers](https://harbyn.com/changes/langsmith/2026-10-14-mcp-tunnel-requests-preserve-authentication-headers.md) - Oct 14, 2026, Rate limit: [Multipart uploads and OTEL batches count toward ingestion limits](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Feature: [OpenAI Decisions added to the gateway](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Behavior change: [OpenTelemetry attributes outside the LangSmith schema are stored in run metadata](https://harbyn.com/changes/langsmith/2026-10-14-opentelemetry-attributes-outside-the-langsmith-schema-are-stored-in-run-metadata.md) - Oct 14, 2026, Behavior change: [Organization updates check permissions for each field](https://harbyn.com/changes/langsmith/2026-10-14-organization-updates-check-permissions-for-each-field.md) - Oct 14, 2026, Feature: [Sandbox command history can be enabled](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Feature: [Sandbox egress supports an HTTP forward proxy](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Behavior change: [Sandbox filesystem capacity capped at 640 GiB by default](https://harbyn.com/changes/langsmith/2026-10-14-sandbox-filesystem-capacity-defaults-to-640-gib.md) - Oct 14, 2026, Feature: [Sandbox host pool can be suspended](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Feature: [Scaledown request types produce traces](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Policy: [Self-serve Cloud plans move to October 2026 pricing](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Rate limit: [Semantic queries receive per-workspace rate limits](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Feature: [GET /api/v1/sessions/resolutions resolves tracing project IDs](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Behavior change: [Teams APIs require the teams entitlement](https://harbyn.com/changes/langsmith/2026-10-14-teams-apis-require-the-teams-entitlement.md) - Oct 14, 2026, Feature: [Thread search and count support metadata exclusions](https://docs.langchain.com/langsmith/changelog) - Oct 14, 2026, Behavior change: [Trace tree responses limited to 1,000 runs](https://harbyn.com/changes/langsmith/2026-10-14-trace-tree-responses-limited-to-1-000-runs.md)