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1fe2f99580
A ModeDefinition is now exactly { section, access? }; unknown keys (a
tools list included) fail loud at load. What plan mode still does: the
guidance section, the exit_plan_mode visibility rule (plan only, both
soft surfaces), the access cap's bash/resolve-mode clamp, and the two
cap-derived pre-execute guards (the bash trio is withheld when no
confining executor can honor the cap; sandbox escalation is denied
while it holds). The general deny-by-default gate and the assemble
allowlist filter are gone: which tools a mode admits is an effects
question, and a hand-maintained name list mislabels it — it must track
every composed tool and rots silently as tools arrive. The dimension
returns as a consumer of effects self-declaration on tool definitions
(MCP ToolAnnotations as the template) — rationale and restart trigger
archived in the RFC's Alternatives/Deferred; the interim guidance-only
non-shell restraint is priced in Consequences.
Exiting plan is now a pure removal (the exit tool + section), which the
delta encoding CAN express: the re-recorded plan-mode fixture pins one
plan-shaped initial header snapshot plus one header-delta instead of
two snapshots.