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Summary

Rolling release PR for OpenEnv 0.12.1 (patch). Version-only change: pyproject.toml, envs/grid_world_env/uv.lock, tests/validation_runtime/uv.lock go from 0.12.1.dev0 to 0.12.1. Merge with --subject "Release OpenEnv 0.12.1 (#<this PR>)".

Type of Change

• Bug fix

Candidate contents since v0.12.0 (main dbdcde2 at time of writing)

• Add OR-Tools environment #1501 ortools env (new environment under envs/, human-merged; kept out of Spaces releases)
• fix(client): stop the plain synchronous client loop on close #1574 fix(client): stop the plain synchronous client loop on close
• Harbor: make endpoint validation work with hosted providers (probe retry/eval fallback, router provider suffixes) #1565 Harbor: endpoint validation with hosted providers (probe retry/eval fallback, router provider suffixes)
• Harbor: a non-zero agent exit after a graded run is a warning, not a failed rollout #1566 Harbor: non-zero agent exit after a graded run is a warning
• Harbor rollout: stop reporting a graded multi-reward rollout as "verifier never ran" #1567 Harbor: graded multi-reward rollouts reported correctly in the CLI
• Serialize the frpc download so parallel harbor rollouts can share a fresh machine #1568 Harbor: serialize gradio frpc download
• Open a new client per game in the Wordle GRPO script #1560 Wordle GRPO example: new client per game (examples/docs only)
• chore(deps): bump oauthlib from 4.0.0 to 4.0.1 in /envs/harbor_env #1563 oauthlib 4.0.1 in harbor_env lock (CVE-2026-49272)

Version decision

Patch: bug fixes plus a new environment; no public core API change. Awaiting human confirmation only if someone wants 0.13.0.

Outstanding / blockers (as of Monday 2026-11-09)

• Fork PRs not merged because CI never ran (need maintainer Approve-and-run): fix(hooks): stop pre-commit and pre-push from rewriting uncommitted work #1576, fix(julia_env): match dangerous calls on a word boundary #1572, fix(tbench2_env): treat a nan or inf reward.txt as no verdict #1570, fix(finqa_env): strip the year label before the percentage points fallback #1569, fix(harbor): pi rollouts that hit a step or context limit fail reconciliation #1561, Update Modal provider to SDK 1.6.3 #1571 (Modal SDK 1.6.3 bump, needs review). Optional; excluded from the release unless approved and merged.
• harbor: --harness module:Class for your own agents, and loopback for host-side agents #1573 (harbor --harness, feature with failing test (3.11)) excluded.
• chore(deps): update fastmcp requirement from <4.0.0,>=3.0.0 to >=3.0.0,<5.0.0 #1331 (fastmcp 4) excluded (breaks session persistence tests).
• Not yet done: TestPyPI validation, final CI refresh on exact head, Echo smoke test (Wednesday/Thursday).

Release state

• Stage: candidate prepared (Mon 2026-11-09). No lock held, no tag, nothing published.
• Release lock ref: refs/release-lock/v0.12.1 (taken Thursday).

RFC Status

• Not required (bug fix, docs, minor refactoring)

Test Plan

CI on exact head; local build + twine check + clean-venv install + Echo reset/step smoke; TestPyPI dry run on Wednesday.

Claude Code Review

N/A