Langfuse October Update: Skill Management, Redesigned Sessions & Scoped API Keys
Skill management, a redesigned session view, scoped API keys, new SDK majors, and our Town Hall on November 12.
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Skill management, a redesigned session view, scoped API keys, new SDK majors, and our Town Hall on November 12. ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ Hi Emre Elbeyoglu, October brought skill management to Langfuse: store, version, and trace agent skills the way you already manage prompts. Alongside it, a new session view and API keys you can scope and expire. Here's what's new: * Skill management: store and version agent skills next to your prompts. * Redesigned session view: messages across traces in one continuous conversation. * Scoped API keys and expiration dates: give each key an Ingestion, Scores ingestion, Viewer, or Full access scope that expires when you choose. * More decision models: score observations with OpenAI or any System One model. * Python SDK v5 and JS/TS SDK v6: new majors (version bump for most users). * Langfuse Government: hardened images and FIPS mode. 🥁 Join us next Thursday, November 12, for the Langfuse Community Town Hall. We'll talk about a big release coming next week and the updated roadmap we're finalizing right now. As always, we'll also demo all the new capabilities we've shipped since the last Town Hall. → Sign up for the Town Hall [https://luma.com/lvp5fx33] Skill management https://langfuse.com/docs/skill-management/overview?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=skill_management Next to prompts, you can now store and version agent skills in Langfuse. A skill is a SKILL.md with task instructions plus optional supporting files. Create skills in the UI, push a local folder, or publish through the API, CLI, MCP, and SDKs. Each version saves the complete set of files, and labels let you promote or roll back a version without changing application code. With skill tracing configured, generations show which skills have been used. The skill's usage tab combines usage counts, file loads, and linked observations. → Read more [https://langfuse.com/docs/skill-management/overview?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=skill_management] Redesigned session view https://langfuse.com/changelog/2026-10-13-redesigned-session-view?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=redesigned_session_view The session view now shows user and assistant messages across traces as one continuous conversation. A sidebar navigates messages, traces, and tool usage, so you can follow where an interaction went off track and jump to the trace behind it. → Read more [https://langfuse.com/changelog/2026-10-13-redesigned-session-view?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=redesigned_session_view] → Post feedback here [https://github.com/orgs/langfuse/discussions/18687] Scoped API keys and expiration dates https://langfuse.com/changelog/2026-10-16-project-api-key-permissions?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=scoped_api_keys_and_expiration_dates Project API keys now carry permissions: Full access, Viewer, Ingestion, or Scores ingestion. Instrument an application with a key that can send traces but cannot read your prompts or datasets, or collect user feedback from a web app with a key that can only submit scores. You can also now set an expiration date for your keys. Existing keys keep working as they are. → Read more [https://langfuse.com/changelog/2026-10-16-project-api-key-permissions?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=scoped_api_keys_and_expiration_dates] More decision models: OpenAI and System One https://langfuse.com/docs/evaluation/evaluation-methods/decision-models?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=decision_models Decision-model evaluators now run on OpenAI's gpt-6-luna through the Decisions API, and on any model that serves TypeSafe's System One API, such as Subquadratic's SubQ Snap or the open-weights Strands Decider you host yourself. Choice, Score, and Yes/no questions work unchanged, so you can use whichever model fits your cost and latency budget. The Langfuse MCP server also supports decision-model evaluators (API/CLI coming soon). → Read more [https://langfuse.com/docs/evaluation/evaluation-methods/decision-models?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=decision_models] Python SDK v5 and JS/TS SDK v6 https://langfuse.com/changelog/2026-10-14-python-sdk-v5-js-sdk-v6?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=python_sdk_v5_and_js_ts_sdk_v6 Both majors are built for Langfuse v4 and mostly remove APIs that were already deprecated, so for most users the upgrade is a version bump. New: experiment_url / experimentUrl links straight to the comparison view, nested metadata becomes filterable dotted paths, span batches are gzip-compressed, and scores are created in batches. If you self-host, both need Langfuse v4.59.0 or later. → Read more [https://langfuse.com/changelog/2026-10-14-python-sdk-v5-js-sdk-v6?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=python_sdk_v5_and_js_ts_sdk_v6] Langfuse Government For government and other highly regulated environments, Langfuse Self-Hosted Government offers a FIPS mode that runs on FIPS 140-3 validated cryptographic modules and hardened images built on Iron Bank's Red Hat UBI 9. → Read more [https://langfuse.com/self-hosting/configuration/hardening?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=langfuse_government] → Talk to us [https://langfuse.com/talk-to-us?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=langfuse_government] New Integrations * Claude Platform: trace the Messages API and Managed Agents with native OpenTelemetry export (docs [https://langfuse.com/integrations/model-providers/claude-platform?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=new_integrations]) * Cursor: trace Cursor agent sessions, including prompts, tool calls, subagents, and token usage (docs [https://langfuse.com/integrations/developer-tools/cursor?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=new_integrations]) * Slack: The Langfuse Slack app is now listed in the Slack Marketplace and lets you get notified for alerts or prompt changes (changelog [https://langfuse.com/changelog/2026-10-30-slack-marketplace?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=new_integrations]) Fixes & Improvements * Feat: The Experiments page now shows the trade-off between quality, cost, and latency across your runs (changelog [https://langfuse.com/changelog/2026-10-19-experiments?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=fixes_improvements]) * Feat: Configure LLM connections once at the organization level and share them with every project; a project connection with the same name takes precedence (changelog [https://langfuse.com/changelog/2026-10-14-organization-llm-connections?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=fixes_improvements]) * Feat: Usage breakdown chart by project or type with CSV export, on the Billing page on Cloud and a new Usage page when self-hosting (changelog [https://langfuse.com/changelog/2026-10-06-organization-usage-breakdown?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=fixes_improvements]) * Data: Scheduled blob storage exports can include score metadata and provenance, such as the evaluator, annotation queue, and execution trace behind each score (changelog [https://langfuse.com/changelog/2026-10-22-blob-storage-score-field-groups?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=fixes_improvements]) * Data: Google Cloud Storage as an export target, with a service account key or ADC (docs [https://langfuse.com/docs/api-and-data-platform/features/export-to-blob-storage?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=fixes_improvements]) * Cost: Prompt cache hit rate shown on traces (v4.60.0 [https://github.com/langfuse/langfuse/releases/tag/v4.60.0]) * UX: Cmd+K jumps to prompts, datasets, annotation queues, and evaluators, and offers create actions and recent picks (v4.70.0 [https://github.com/langfuse/langfuse/releases/tag/v4.70.0]) * API: POST /api/public/scores accepts batches (v4.55.0 [https://github.com/langfuse/langfuse/releases/tag/v4.55.0]) * Evals: Evaluator gallery restyled with score previews; evaluator status shows seven-day execution health (v4.60.0 [https://github.com/langfuse/langfuse/releases/tag/v4.60.0]) * Self-hosting: Outbound host allowlists for LLM connections, webhooks, media, and blob storage endpoints (docs [https://langfuse.com/self-hosting/configuration/hardening?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=fixes_improvements#outbound-url-allowlists]) * Self-hosting: Guide to export application logs to ClickStack (docs [https://langfuse.com/guides/export-self-hosted-langfuse-logs-to-clickstack?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=fixes_improvements]) * and many more! Blog * How we built Halo [https://langfuse.com/blog/2026-10-21-building-the-langfuse-assistant?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=blog]: Ben on building our in-app assistant on the MCP server, why the agent runs outside its sandbox, and how background runs work * Customer story: DKB [https://langfuse.com/users/dkb?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=blog]: how DKB keeps an AI banking assistant for around 6 million customers accurate and compliant with self-hosted Langfuse, with engineers and customer service experts working in the same place * Two guides for platform teams: Provisioning and governing Langfuse across teams [https://langfuse.com/blog/2026-10-22-provisioning-and-governing-langfuse-across-teams?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=blog] and Operating Langfuse as an internal service [https://langfuse.com/blog/2026-10-22-operating-langfuse-as-an-internal-service?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=blog] Reminder: Langfuse v4 cutover on November 16 Langfuse Cloud becomes v4-only on November 16, 2026. Open the Migration Assistant in the sidebar; if it lists required actions for your project, finish them before the cutover. → Upgrade guide [https://langfuse.com/faq/all/upgrade-to-langfuse-v4?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=v4_cutover_reminder] Contribute Full-Time (New: US-East) https://clickhouse.com/company/careers?search=langfuse Our team is growing (we now hire remote in US-East!). If you're passionate about building open source AI dev tools, we'd love to hear from you. * Senior Product Engineer (US-East) [https://clickhouse.com/company/careers?search=langfuse] * Senior Backend Engineer (US-East) [https://clickhouse.com/company/careers?search=langfuse] * Product Manager [https://clickhouse.com/company/careers?search=langfuse] * Senior Product Engineer, Integrations [https://clickhouse.com/company/careers?search=langfuse] * Senior Product Engineer [https://jobs.ashbyhq.com/clickhouse/0087feaa-a275-427d-bf4a-14a508708687] * Senior Backend Engineer [https://jobs.ashbyhq.com/clickhouse/31500bec-b690-4795-b4d6-0dce06a4c180] * Senior Cloud Infrastructure Engineer [https://jobs.ashbyhq.com/clickhouse/cf36e6db-3939-4ff0-8bcf-a3bb200d9e46] * Senior Software Engineer, SDK [https://jobs.ashbyhq.com/clickhouse/2344ae13-045c-4513-ad01-94189029c46e] * Developer Relations Engineer, Events & Community (EMEA [https://jobs.ashbyhq.com/clickhouse/49953f5a-271a-492f-a8be-50b8f028fbd7], AMER [https://jobs.ashbyhq.com/clickhouse/7b0174fe-f124-4db2-923f-7028f39d6be9]) * Head of Marketing [https://clickhouse.com/company/careers?search=langfuse] → See all open roles [https://clickhouse.com/company/careers?search=langfuse] ($5,000 for successful referrals!) Any feedback, questions, or ideas? Just hit reply; we read and respond to every message. Best, Marc — Co-founder & CEO, langfuse.com [https://langfuse.com?utm_source=langfuse&utm_medium=email&utm_campaign=product_update_2026_10&utm_content=signature] 🐧 @marcklingen [https://x.com/marcklingen] ⭐️ github.com/langfuse/langfuse [https://github.com/langfuse/langfuse/] You are receiving this email because you opted in to receive email from the list Cloud Product Updates from Langfuse Langfuse, Langfuse GmbH, Oranienburger Strasse 91, 10178, Berlin, Germany Unsubscribe [https://app.loops.so/unsubscribe/cmw52d6s924l401wf2hbw37n0/88fd5be8b7b3888057c12fd4437403f0f0f602b262fac296e09b718ed2fceb92ade928dcb9c74226ac0d09ca122805eed320852627f5daca194771cb]
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- nse/langfuse/2026-11-06/6307
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- Marc Klingen · marc@updates.langfuse.com
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- 6 November 2026 · 14:00 UTC
