{"type":"post","id":"see-every-agent-session-in-ai-gateway-logs-2243ee","slug":"see-every-agent-session-in-ai-gateway-logs-2243ee","title":"See every agent session in AI Gateway logs.","description":"Vercel’s Sessions view changes the unit of inspection in AI Gateway logs from isolated requests to multi-turn agent sessions.","retrieval_nugget":"Vercel’s Sessions view changes the unit of inspection in AI Gateway logs from isolated requests to multi-turn agent sessions.","published_at":"2026-10-18","updated_at":"2026-10-18","record_date":"2026-10-18","date_kind":"published_at","topics":["agent-observability","observability","agents"],"source_urls":["https://vercel.com/changelog/ai-gateway-logs-now-show-session-affinity"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:see-every-agent-session-in-ai-gateway-logs-2243ee","status":"published","visuals":[],"editorial_provenance":{"schema_version":"newruntime-editorial-copy-v1","content_status":"source_grounded_final","final_copy_sha256":"sha256:5ad0f1b50684a297f01fe2cc83b1898284e866effd61ad29744bda4dc2f72f5d","reviewed_at":"2026-10-18T20:03:11.856Z","source_evidence_count":1,"verified_claim_count":3,"site_analysis_schema_version":"newruntime-site-analysis-v1","site_object_kind":"field_note","observed_fact_count":3,"implication_count":1,"watch_condition_count":1,"related_record_count":0},"analysis":{"schema_version":"newruntime-site-analysis-v1","object_kind":"field_note","thesis":"Session-level observability can make the relationship between provider routing, prompt caching, and spend inspectable, even though it does not itself prove savings.","observed_facts":[{"text":"The Sessions view groups requests and shows the coding agent or app, cost, models, providers, and cached-input share across turns.","source_urls":["https://vercel.com/changelog/ai-gateway-logs-now-show-session-affinity"]},{"text":"Opening a session shows cache hit rate, duration, and a turn-by-turn path with model, timing, and provider.","source_urls":["https://vercel.com/changelog/ai-gateway-logs-now-show-session-affinity"]},{"text":"Session affinity routes each turn to the provider that served the prior turn; users can also supply a repeated sessionId or x-session-id.","source_urls":["https://vercel.com/changelog/ai-gateway-logs-now-show-session-affinity"]}],"mechanism":"Grouping turns into sessions exposes provider continuity and cache behavior alongside cost; affinity keeps successive turns on the preceding provider, where more prompt content may be cached.","why_now":"Multi-turn coding and chat agents make individual request logs a poor unit for understanding provider continuity and accumulated cost.","implications":["Teams using AI Gateway can inspect session-level routing and cache behavior without reconstructing conversations from scattered requests."],"evidence_boundary":"The source is a product changelog describing fields and behavior; it offers no independent performance measurements, before-and-after cost data, or evidence that affinity improves every workload.","watch_conditions":["Whether teams can show lower per-session cost or latency while preserving routing reliability."],"related_records":[],"new_branch_reason":"No prior New Runtime record is supplied for this specific session-logging release; this records the distinct observability change without asserting a link to an earlier record."},"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/see-every-agent-session-in-ai-gateway-logs-2243ee/","markdown":"https://newruntime.com/posts/see-every-agent-session-in-ai-gateway-logs-2243ee.md","json":"https://newruntime.com/posts/see-every-agent-session-in-ai-gateway-logs-2243ee.json"},"related_patterns":["runtime-observability-becomes-the-primary-engineering-focus-for-ai"],"next_reads":[{"type":"topic","path":"/topics/agent-observability/","url":"https://newruntime.com/topics/agent-observability/","title":"Agent Observability","reason":"Explore the agent-observability topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agent-observability.md","json_url":"https://newruntime.com/topics/agent-observability.json"},{"type":"topic","path":"/topics/observability/","url":"https://newruntime.com/topics/observability/","title":"Observability","reason":"Explore the observability topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/observability.md","json_url":"https://newruntime.com/topics/observability.json"},{"type":"topic","path":"/topics/agents/","url":"https://newruntime.com/topics/agents/","title":"Agents","reason":"Explore the agents topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agents.md","json_url":"https://newruntime.com/topics/agents.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}