{"model":"jev-latest","state":{"goal":"Score this entity on the Jev Quadrant rubric using only the supplied evidence.","framework":"jev-quadrant-v1","topic":{"id":"agent-observability","title":"Agent observability and guardrails","x_axis":"Proven Execution","y_axis":"Validated Direction"},"entity":{"id":"langfuse","name":"Langfuse","website":"https://langfuse.com","description":"Open-source LLM and agent observability with cloud and self-host options."},"evidence":[{"id":"langfuse-v4","kind":"release","url":"https://langfuse.com/changelog/2026-08-17-langfuse-v4","date":"2026-08-17","date_kind":"published","recency_weight":0.8606,"summary":"Langfuse v4 launched on Langfuse Cloud and as GA for self-hosted deployments, claiming millisecond table loads and at least 10× faster long-range dashboards. Cloud becomes v4-only on 16 November 2026; v3 self-host security patches run through January 2027.","title":"Langfuse v4 is live"},{"id":"langfuse-may","kind":"announcement","url":"https://langfuse.com/blog/2026-05-31-langfuse-may-update","date":"2026-05-31","date_kind":"published","recency_weight":0.6373,"summary":"Langfuse’s May launch week shipped MCP, experiments in CI/CD, and an Agent Skill that coding agents can use to instrument apps and set up evaluators.","title":"Langfuse May 2026 update / launch week"},{"id":"langfuse-assistant","kind":"release","url":"https://langfuse.com/changelog/2026-09-03-langfuse-assistant","date":"2026-09-03","date_kind":"published","recency_weight":0.9188,"summary":"Langfuse shipped an Assistant for analyzing thousands of observations, with accompanying agent-skill and CLI guidance.","title":"Langfuse Assistant"}],"claims":[],"independent_checks":[],"recency":{"half_life_days":180,"as_of":"2026-09-25","mass":2.4166}},"questions":{"exec_shipped":{"type":"noul","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Has this entity shipped a generally available product used by third parties?","criteria":{"true":"Independent public evidence shows a generally available product used by third parties.","false":"The product is announced, preview-only, or evidenced only by unsourced vendor marketing with no third-party use."}},"exec_adoption":{"type":"noul","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Is there credible adoption evidence?","criteria":{"true":"Credible adoption evidence exists: named customers, published user or download counts, case studies, or equivalent.","false":"Adoption claims are absent, purely anecdotal, or unsourced."}},"exec_reliability":{"type":"noul","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Is there evidence of reliability, quality, security/compliance, or operational maturity?","criteria":{"true":"Evidence of reliability, quality, security/compliance, or operational maturity (uptime, incidents handled, certifications, long-running open-source project).","false":"No reliability or quality evidence is present."}},"exec_cadence":{"type":"noul","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Is there evidence of continued delivery after launch?","criteria":{"true":"Evidence of continued delivery after launch (dated releases, changelog, subsequent features).","false":"Delivery appears one-shot or stalled."}},"dir_strategy":{"type":"noul","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Is there a specific, consistent, dated public strategy or roadmap?","criteria":{"true":"A public strategy or roadmap is specific, consistent, and dated.","false":"Direction is vague, contradictory, or only implied."}},"dir_backed":{"type":"noul","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Are strategy or roadmap claims backed by shipped artifacts in the evidence pack?","criteria":{"true":"Roadmap or strategy claims are backed by shipped artifacts in the evidence pack.","false":"Direction is promised without corresponding delivery evidence."}},"dir_distinct":{"type":"noul","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Is the evidenced direction distinct from generic category copy?","criteria":{"true":"The evidenced direction is distinct from generic category copy.","false":"Positioning is interchangeable with peers."}},"dir_invested":{"type":"noul","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Is there evidence of sustained investment in this product?","criteria":{"true":"Evidence of sustained investment (funding used for the product, research, open-source velocity, or platform expansion).","false":"No evidence of continued investment."}},"quadrant":{"type":"choice","instructions":"Use only the supplied state. Do not use prior knowledge that is not represented as evidence items. If evidence is thin, return a probability near 0.5 with the understanding that uncertainty is handled separately. Assign the entity to one Jev Quadrant cell. Do not use a hard 0.5 cut. Weigh the full evidence pack.","criteria":{"ANCHORED":"Both delivery (proven execution) and evidenced direction (validated direction) are strong.","DIRECTED":"Validated direction is better evidenced than proven execution.","OPERATIONAL":"Proven execution is better evidenced than validated direction.","FORMING":"Both axes are thin, early, or contradicted."}}}}