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Two failure classes hit by a downstream team: 1) tmux/task-env death (TerminalBenchTaskEnv.__enter__, terminalbench_env.py): create_session ran inside the spin_up_terminal generator-CM with no exception safety — a tmux failure leaked the docker compose project (down deferred to GC, never if the env was retained) and surfaced as an opaque mid-run death. Now: exception-safe __enter__ with an idempotent _teardown(), a tmux/asciinema preflight in the container BEFORE the agent loop (TaskEnvironmentError naming the task image + remedy), and fail-that-task-cleanly semantics — the failure is recorded as a harness error (QueryTrace.error_kind="harness_error"), the container is downed, and the run continues. 2) OpenHands in-container SETUP hang misattributed as a model result: harness.run() had no bound (terminal-bench runs installed-agent setup with max_timeout_sec=inf inside the per-trial agent budget), and the summary conversion read the nonexistent results.trial_results attr and hardcoded errors=0, folding zero-model-request trials into resolve-rate as model misses. Now: global_agent_timeout_sec / global_timeout_multiplier are threaded config -> backend -> Harness kwargs (default 1800 s bound on SETUP+RUN; configurable per [run]/[[benchmarks]] TOML), and summarize_benchmark_results() classifies harness/infra failures out of the accuracy denominator keyed on token usage (zero/missing tokens + unresolved = the agent never contacted the model), NOT failure_mode — terminal-bench 0.2.18 leaves failure_mode UNSET on success AND on genuine misses, so a failure_mode-based check would misflag every real model miss. Genuine misses (tokens>0, is_resolved=false) stay in the denominator. QueryTrace gains error/error_kind (wired through to_dict/from_dict so the fields actually reach traces.jsonl; backward-compatible loads), the AgenticRunner flags zero-model-contact traces and TaskEnvironmentError as harness errors, and export/summary/console output exclude harness errors from resolve-rate while reporting them loudly. terminal-bench stays an undeclared dep on purpose: it requires Python >=3.12 while this project supports >=3.10,<3.14, so an unmarked extra would break uv lock. pyproject/uv.lock untouched. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>