Recap

The question

How do the design decisions fit together?

Eight decisions, two kinds of pressure.

Pressure	Design decision
Capability	read_file · search_code · edit · shell
Capability	Context manager: retain / summarize / drop
Capability	State split by format: JSONL / JSON / Markdown / repo
Cost	Model routing via PreToolUse hooks
Capability	Dynamic planner, conditional on complexity
Cost	Subagents only when isolation or parallelism pays for the ~15× token overhead
Cost	Gate: independent + non-conflicting, or stay in the main agent
Cost	Conflicts: partition first, git worktrees if unavoidable

Continue to topic 14 of 14.