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context-checkup

Audit what auto-loads into an agent session's context window and suggest lean, reversible fixes to cut startup tokens.

skills/context-checkup/SKILL.md

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# Context checkup

Find what loads **automatically** into the session's context at startup, quantify it, and propose
**reversible** trims ranked by payoff — shrink the startup context window by cutting what isn't
worth its tokens. Read-only — measure and recommend; change settings only on explicit approval.

## Mental model (spend attention top-down)

Cost hierarchy, biggest first:
1. **MCP tool schemas** — large, but **deferred** by tool search. Only a problem if tool search is
   OFF.
2. **Always-on text** — every always-on instruction file (entry-file chain, `@imports`, unscoped
   rules files) and **skill/agent/command descriptions**: every available one's description
   loads every session, except skills flagged non-model-invocable (their description never