3.6.0 (2026-10-30)
Features
- annotations: add DECISION and AGENT kinds (#17306) (9e7a797)
- api: expose prompt version creation timestamps (#17188) (87a9934)
- client: expose trace and session filter expressions (#16078) (dab09f1)
- client: sort get_spans by start_time (#16386) (9f44910)
- harbor: prompt hill-climb task on a text-to-SQL dataset (#16458) (bd78550)
- load optional Harbor task reference outputs (#16656) (7556cee)
- record Harbor agent responses as run output (#16645) (c739243)
Bug Fixes
- client: format string system messages in anthropic adapter (#16316) (435de9b)
- client: handle the between_tools thinking type in the anthropic helper (#16725) (bcec2c5)
- client: keep a label of 0 when logging annotation dataframes (#17208) (f74341f)
- client: keep tools when anthropic tool_choice is none (#16535) (8ce05ec)
- client: normalize IPv6 PHOENIX_HOST values into valid URLs (0a2583f)
- client: omit missing annotation dataframe cells (#16593) (b438233)
- client: preserve Anthropic prompt extra_body (#17270) (deb0731)
- client: preserve JSON string span attribute filters (#17295) (057de00)
- client: reject anchored Harbor reference paths on Windows (#16884) (34f73f9)
- client: return empty list from Sessions.list when limit <= 0 (#17074) (e554217)
- client: treat developer role as system for Anthropic and Google prompt formatting (#17320) (4e93c4b)
- deps: require certifi 2026.10.18 to distrust the compromised emSign root (#17093) (9056a4a)
- evals: retry RateLimitError in SyncExecutor instead of failing the whole run (#16376) (56e9a89)
- otel, client, config: parse .env.phoenix the same way in Python and TypeScript (#17075) (67cc379), closes #17048
- stop dropping evaluator metadata nested under
result(#16902) (d927595)
Documentation
- client: drop the phantom concurrency param from evaluate_experiment (#16268) (6f03f90)
- close gaps from the 2026-09-23 docs gap audit (#17193) (e62d1bb)
- fix dead Read the Docs links (#16967) (0fed1f4)
- index notebooks and remove unreferenced examples (#16370) (04996d2)
- remove contribute, environments, and non-competitive FAQ pages (#17423) (843bfc7)