Files
hermes-agent/tools
teknium1 9a49b3c984 fix(execute_code): subagent kernels survive the LRU cap for the child's lifetime
A delegated child's execute_code kernel was keyed correctly
(<owner>::child::<session>) but counted against the process-wide
max_session_kernels LRU cap (default 4) like any other kernel. In a fan-out
wider than the cap every child's first cell spawned a kernel and evicted the
oldest sibling's, so the sibling's next cell started a fresh interpreter and
NameError'd on state its own previous cell had set — while the tool schema
promised "variables, imports, and loaded data survive across execute_code
calls". Finished children's kernels also squatted the cap for
kernel_idle_timeout (1800 s) after the child was gone. 48 NameErrors across 28
subagent lanes in the Sep 10-14 retrospective.

A live child's kernel (local and remote) is now pinned: exempt from LRU
eviction while the child runs, disposed by the delegation cleanup path
(shutdown_kernels_for_delegated_child) as soon as the child finishes. Top-level
sessions keep the existing cap and idle reaping unchanged.
2026-09-15 03:45:41 -07:00
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