A Run behavior call started with fresh variables every time, so a nested behavior could not count, remember or keep a local state machine across calls. A new "Keep state" switch on the node lets the callee resume where its last call left off. It is off by default, so existing projects run unchanged. - RunBehavior gets the boolean parameter keepState and its node description explains it. - GraphInterpreter keeps the state in keptCalls, keyed by the call path, the chain of Run behavior nodes. Two nodes calling the same behavior each keep their own state. - One interpreter exists per behavior instance, so every object gets its own state without further code. - Local state machines of the callee are kept like its variables. - resumedVariables() matches kept values against today's declarations. A new variable starts at its default, a removed one drops out, and one whose kind changed starts over. - The kept state lives as long as the object in the run. It is not written to save games. Limit: a callee input named keepState collides with the switch. The same already holds for the name behavior, so it is not caught. Tests: - ./check.sh: 163 files, 2388 tests, CHECK EXIT 0 (before 2377) - 10 new unit tests in tests/core/keep-state.test.ts and 1 new node catalog case. - e2e 19: ALL PASSED, 35 checks, with the new check 19c-ii for the checkbox, its click and undo. - Counter probes: ignoring keepState fails 5 tests, state per behavior instead of per node fails 1, dropping the outer path fails 1, skipping the kind check fails 1, and without the node parameter the e2e check fails. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>