Verifiers v0.1.13.dev6 Release Notes

Date: 04/23/2026

Highlights since v0.1.13.dev5

• rlm_harness is now the single source of truth for RLM_* sandbox env vars. New kwargs rlm_max_turns, rlm_max_turns_in_context, rlm_exec_timeout map 1:1 onto the matching env vars on Harness.environment_vars and merge into the sandbox via ComposableEnv.build_env_vars (harness-wins). Research envs can stop setting these via ComposableEnv(environment_vars=…) — pass them through as harness kwargs instead.
• TaskSet.filter / .take now return Self, not TaskSet, so subclass types survive taskset chaining for downstream typed consumers.

Changes included in v0.1.13.dev6 (since v0.1.13.dev5)

Features and enhancements

• rlm_harness: own RLM_MAX_TURNS / _IN_CONTEXT / _EXEC_TIMEOUT env vars (#1229)

Fixes and maintenance

• types: TaskSet.filter / .take return Self, not TaskSet (#1232)

Full Changelog: v0.1.13.dev5...v0.1.13.dev6