sandbox-routing

# Sandbox Routing > [!danger] HARD RULE — fires before any large Read or Bash that isn't for editing > If you're about to Read a long file to *analyze* (not to Edit), or run a Bash command with >20 line output, **route through sandbox tools instead**. Raw output stays out of context; only the summary you print enters context. This skill assumes your Claude Code install includes context-mode (or equivalent) sandbox tools — `ctx_execute`, `ctx_execute_file`, `ctx_batch_execute`. If those aren't available, the principle still applies: use `head_limit` on Grep, narrow Read to specific line ranges, and avoid `cat large.log`. ## The decision tree ``` Am I about to Read or run Bash? ├── Editing a file? (need full content for Edit tool) │ → Read is correct, proceed │ ├── Running git status / git log -n short / mkdir / mv / rm / short command? │ → Bash is correct, proceed │ ├── Reading a file just to extract a piece of info / find a line? │ → STOP. Use ctx_execute_file with grep/awk code that prints just the answer. │ ├── Running a shell command with >20 line output? │ → STOP. Use ctx_execute with the same command — only printed summary enters context. │ └── Multiple commands at once? → Use ctx_batch_execute with all commands as labelled chunks, indexed for FTS5 search. ``` ## When to use each tool ### `ctx_execute(language, code)` - Shell command with large output → `language: "shell"` - Python data processing → `l...