Fix v1 lifecycle handler discovery

[xeophon]

Summary

• require lifecycle handler marker attributes to be exactly True
• avoid collecting unrelated callable attributes/classes as lifecycle handlers

Validation

• uv run ruff check verifiers/v1/utils/lifecycle_utils.py
• uv run ruff format --check verifiers/v1/utils/lifecycle_utils.py

---

Note

Medium Risk
Changes which callables are discovered as lifecycle handlers by requiring marker attributes to be exactly True, which could alter runtime behavior for existing toolsets that relied on truthy non-boolean markers.

Overview
Fixes v1 lifecycle handler discovery so only callables explicitly marked with lifecycle attributes (e.g. stop, setup, update, cleanup) set to True are collected.

This tightens handler filtering in both Runtime._rollout_handlers and collect_handlers, reducing accidental pickup of unrelated callable members and making stage-based lifecycle execution more predictable.

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Missed handler discovery fix at third occurrence

Medium Severity

The _toolset_binding_targets method at line 966 still uses the old truthiness check (getattr(method, attr, False)) to discover lifecycle handler methods, while the same pattern was intentionally tightened to is True in _rollout_handlers and collect_handlers. This means _toolset_binding_targets can still falsely pick up unrelated callable attributes as lifecycle handler binding targets — the exact bug this PR intends to fix.

Additional Locations (1)

• verifiers/v1/runtime.py#L1218-L1219

 

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