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context-mode — MANDATORY routing rules

context-mode MCP tools available. Rules protect context window from flooding. One unrouted command dumps 56 KB into context. Codex CLI hooks provide runtime enforcement when [features].hooks = true; these instructions remain mandatory model-side enforcement. Follow strictly.

Think in Code — MANDATORY

Analyze/count/filter/compare/search/parse/transform data: write code via ctx_execute(language, code), console.log() only the answer. Do NOT read raw data into context. PROGRAM the analysis, not COMPUTE it. Pure JavaScript — Node.js built-ins only (fs, path, child_process). try/catch, handle null/undefined. One script replaces ten tool calls.

BLOCKED — do NOT use

curl / wget — FORBIDDEN

Do NOT use curl/wget in shell. Dumps raw HTTP into context. Use: ctx_fetch_and_index(url, source) or ctx_execute(language: "javascript", code: "const r = await fetch(...)")

Inline HTTP — FORBIDDEN

No node -e "fetch(...", python -c "requests.get(...". Bypasses sandbox. Use: ctx_execute(language, code) — only stdout enters context

Direct web fetching — FORBIDDEN

Raw HTML can exceed 100 KB. Use: ctx_fetch_and_index(url, source) then ctx_search(queries)

REDIRECTED — use sandbox

Shell (>20 lines output)

Shell ONLY for: git, mkdir, rm, mv, cd, ls, npm install, pip install. Otherwise: ctx_batch_execute(commands, queries) or ctx_execute(language: "shell", code: "...")

File reading (for analysis)

Reading to edit → reading correct. Reading to analyze/explore/summarize → ctx_execute_file(path, language, code).

grep / search (large results)

Use ctx_execute(language: "shell", code: "grep ...") in sandbox.

Tool selection

  1. MEMORY: ctx_search(sort: "timeline") — after resume, check prior context before asking user.
  2. GATHER: ctx_batch_execute(commands, queries) — runs all commands, auto-indexes, returns search. ONE call replaces 30+. Each command: {label: "header", command: "..."}.
  3. FOLLOW-UP: ctx_search(queries: ["q1", "q2", ...]) — all questions as array, ONE call (default relevance mode).
  4. PROCESSING: ctx_execute(language, code) | ctx_execute_file(path, language, code) — sandbox, only stdout enters context.
  5. WEB: ctx_fetch_and_index(url, source) then ctx_search(queries) — raw HTML never enters context.
  6. INDEX: ctx_index(content, source) — store in FTS5 for later search.

Parallel I/O batches

For multi-URL fetches or multi-API calls, always include concurrency: N (1-8):

  • ctx_batch_execute(commands: [3+ network commands], concurrency: 5) — gh, curl, dig, docker inspect, multi-region cloud queries
  • ctx_fetch_and_index(requests: [{url, source}, ...], concurrency: 5) — multi-URL batch fetch

Use concurrency 4-8 for I/O-bound work (network calls, API queries). Keep concurrency 1 for CPU-bound (npm test, build, lint) or commands sharing state (ports, lock files, same-repo writes).

GitHub API rate-limit: cap at 4 for gh calls.

Output

Write artifacts to FILES — never inline. Return: file path + 1-line description. Descriptive source labels for ctx_search(source: "label").

Session Continuity

Skills, roles, and decisions persist for the entire session. Do not abandon them as the conversation grows.

Memory

Session history is persistent and searchable. On resume, search BEFORE asking the user:

Need Command
What were we working on? ctx_search(queries: ["summary"], source: "compaction", sort: "timeline")
What did we decide? ctx_search(queries: ["decision"], source: "decision", sort: "timeline")
What NOT to repeat? ctx_search(queries: ["rejected"], source: "rejected-approach")
What constraints exist? ctx_search(queries: ["constraint"], source: "constraint")

Note: user-prompt history not available.

DO NOT ask "what were we working on?" — SEARCH FIRST. If search returns 0 results, proceed as a fresh session.

ctx commands

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

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

Windows notes

PowerShell cmdlets — Sandbox uses bash. PowerShell cmdlets (Format-List, Get-Culture, etc.) fail with command not found. Wrap with pwsh -NoProfile -Command "...".

Relative paths — Sandbox CWD is temp dir, not project root. Convert to absolute paths. Ask user to confirm if unknown.

Windows drive letters — Sandbox runs Git Bash / MSYS2. X:\path → /x/path (lowercase, no /mnt/). Never emit /mnt/<letter>/.

Quote paths — Spaces in paths cause splits. Always double-quote: rg "symbol" "$REPO_ROOT/some dir/Source".