context-windowlisted

# Context Window ## Coverage The quantitative discipline behind an agent's working memory. Allocates the context-window budget across three zones: System (system prompt, rules, tool schemas), Skill Injection (the SKILL.md files auto-loaded for the current task), and Working (conversation, tool results, file contents, agent output). Names the three context health states — `ok` (< 60% used), `compact` (60–80%), `exhausted` (> 80%) — and the **80% compaction rule** that compaction must always trigger before the budget is fully consumed, leaving 20% as the safety margin for finishing the current operation, writing the checkpoint, running the closeout protocol, and emitting the continuation signal. Specifies the pre-compact protocol (commit uncommitted changes, write the continuation signal, update the checkpoint, save state that cannot be re-derived from git or disk) and the post-compact recovery flow (re-injection of git status, active-task reference, recent commits, critical findings). Catalogs typical token consumption per operation type (full file read 20–40K, large tool-result JSON 10–30K, single SKILL injection 3–8K, fixed system overhead) and the five token-reduction techniques: deterministic-CLI over heavy MCP / tool-result paths, targeted file reads with `offset` + `limit` instead of full-file reads, search-before-read (grep first, read the match), progressive skill disclosure (small SKILL.md kept always loaded; large reference files loaded on demand), and count-mode f