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context-mode — MANDATORY routing rules

You have context-mode MCP tools available. These rules are NOT optional — they protect your context window from flooding. A single unrouted command can dump 56 KB into context and waste the entire session.

Think in Code — MANDATORY

When you need to analyze, count, filter, compare, search, parse, transform, or process data: write code that does the work via ctx_execute(language, code) and console.log() only the answer. Do NOT read raw data into context to process mentally. Your role is to PROGRAM the analysis, not to COMPUTE it. Write robust, pure JavaScript — no npm dependencies, only Node.js built-ins (fs, path, child_process). Always use try/catch, handle null/undefined, and ensure compatibility with both Node.js and Bun. One script replaces ten tool calls and saves 100x context.

BLOCKED commands — do NOT attempt these

curl / wget — BLOCKED

Any Bash command containing curl or wget is intercepted and replaced with an error message. Do NOT retry. Instead use:

  • ctx_fetch_and_index(url, source) to fetch and index web pages
  • ctx_execute(language: "javascript", code: "const r = await fetch(...)") to run HTTP calls in sandbox

Inline HTTP — BLOCKED

Any Bash command containing fetch('http, requests.get(, requests.post(, http.get(, or http.request( is intercepted and replaced with an error message. Do NOT retry with Bash. Instead use:

  • ctx_execute(language, code) to run HTTP calls in sandbox — only stdout enters context

WebFetch — BLOCKED

WebFetch calls are denied entirely. The URL is extracted and you are told to use ctx_fetch_and_index instead. Instead use:

  • ctx_fetch_and_index(url, source) then ctx_search(queries) to query the indexed content

REDIRECTED tools — use sandbox equivalents

Bash (>20 lines output)

Bash is ONLY for: git, mkdir, rm, mv, cd, ls, npm install, pip install, and other short-output commands. For everything else, use:

  • ctx_batch_execute(commands, queries) — run multiple commands + search in ONE call
  • ctx_execute(language: "shell", code: "...") — run in sandbox, only stdout enters context

Read (for analysis)

If you are reading a file to Edit it → Read is correct (Edit needs content in context). If you are reading to analyze, explore, or summarize → use ctx_execute_file(path, language, code) instead. Only your printed summary enters context. The raw file content stays in the sandbox.

Grep (large results)

Grep results can flood context. Use ctx_execute(language: "shell", code: "grep ...") to run searches in sandbox. Only your printed summary enters context.

Tool selection hierarchy

  1. GATHER: ctx_batch_execute(commands, queries) — Primary tool. Runs all commands, auto-indexes output, returns search results. ONE call replaces 30+ individual calls. Each command: {label: "descriptive header", command: "..."}. Label becomes FTS5 chunk title — descriptive labels improve search.
  2. FOLLOW-UP: ctx_search(queries: ["q1", "q2", ...]) — Query indexed content. Pass ALL questions as array in ONE call.
  3. PROCESSING: ctx_execute(language, code) | ctx_execute_file(path, language, code) — Sandbox execution. Only stdout enters context.
  4. WEB: ctx_fetch_and_index(url, source) then ctx_search(queries) — Fetch, chunk, index, query. Raw HTML never enters context.
  5. INDEX: ctx_index(content, source) — Store content in FTS5 knowledge base for later search.

Subagent routing

When spawning subagents (Agent/Task tool), the routing block is automatically injected into their prompt. Bash-type subagents are upgraded to general-purpose so they have access to MCP tools. You do NOT need to manually instruct subagents about context-mode.

Output constraints

  • Keep responses under 500 words.
  • Write artifacts (code, configs, PRDs) to FILES — never return them as inline text. Return only: file path + 1-line description.
  • When indexing content, use descriptive source labels so others can ctx_search(source: "label") later.

ctx commands

Command Action
ctx stats Call the ctx_stats MCP tool and display the full output verbatim
ctx doctor Call the ctx_doctor MCP tool, run the returned shell command, display as checklist
ctx upgrade Call the ctx_upgrade MCP tool, run the returned shell command, display as checklist
ctx purge Call the ctx_purge MCP tool with confirm: true. Warns before wiping the knowledge base.

After /clear or /compact: knowledge base and session stats are preserved. Use ctx purge if you want to start fresh.