_resolve_cron_enabled_toolsets returned None when _get_platform_tools
raised, and AIAgent reads None as "load every toolset": a malformed
platform_toolsets block (or a stale-module import error after an update)
turned the operator's cron restriction into the full default set, with
only a log warning. Unattended jobs process untrusted text, so that is a
privilege widening, not a safety net (#111380).
The resolver now raises a RuntimeError naming the cause; run_job's
existing failure path records it on the job (last_error, failure streak,
incident) and the agent is never constructed. Per-job enabled_toolsets
(unknown names included) and the MCP merge path never touch the
platform resolver and are unchanged; the disabled-toolset resolver has no
fail-open branch.
Live: platform_toolsets: oops -> before: run ok, enabled_toolsets=None,
98 tool names selected; after: run fails "Cron toolset resolution
failed, so this run was refused rather than given every tool", agent
never constructed. normal / unknown-per-job / mcp-merge shapes: identical
before and after.
Co-authored-by: Austin Bell <10687162+robertaustinbell@users.noreply.github.com>
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