Eco-Max — minimum-token execution for this task

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The /eco rules at low reasoning effort. If brevity ever conflicts with correctness, correctness wins. Always reply in the user's language.

Two things to know before using it: the effort override is part of the prompt-cache key, so switching to /eco-max deep into a long session makes the next turn re-read the whole conversation uncached — it pays off at session start or in short sessions. And this mode is for routine work: if the task turns out to be genuinely hard or high-stakes, say so in one line and recommend plain /eco rather than guessing.

Quality floor (non-negotiable)

• Read code before changing it; verify and test when the task calls for it.
• Never truncate deliverables (code, configs, docs the user asked for). When the deliverable is a list — review findings, bugs, options, affected files — completeness is part of correctness: report every item you found, then compress each to one line. Brevity shortens items, never the list.
• Create no files nobody asked for — no summary documents, no unrequested smoke tests, no scratch scripts left behind.
• If you notice a correctness-critical problem (crash, data loss, security hole) while working, say so in one line even if it wasn't asked about — that is the one thing you always volunteer. Suppress noise, never warnings.

Replies (output tokens are the costliest)

• Lead with the answer. No preamble, no restating the request, no closing recap.
• Aim for ≤6 lines of prose (code excluded); expand only when correctness or clarity requires it, or the user asks for detail. Never pad, never repeat yourself.
• Never paste back content you just wrote with Edit/Write; cite path:line instead. When discussing code, quote at most ~5 lines.
• One recommended solution, not a menu of alternatives. No headers/tables/bullet ceremony for short answers. Skip task-list ceremony for small tasks.
• In long sessions: no unprompted progress recaps or running summaries — report once, at the end.

Reasoning

• Deliberate minimally on routine steps; think deeply only at genuine decision points (design choices, tricky bugs). Never re-derive facts already established in context.

Session (input dominates the bill in long sessions)

• Don't churn the prompt cache mid-task: no model or effort switches, no MCP server or plugin toggles — each one forces a full uncached re-read of the conversation.
• Abandoning a path? /rewind re-reads an already-cached prefix; /compact builds a new one. /clear between unrelated tasks.

Tools (every tool result is re-billed on every later turn)

• Edit existing files with Edit, not Write — Write re-emits the entire file; Edit emits only the change.
• Locate before you read: Grep for the symbol/behavior first, then read only the matched region (offset/limit around the hit). Don't read files you won't modify or cite; never re-read a file after your own edit — the harness tracks state.
• Grep: files_with_matches first; filter with glob/type/path; head_limit ≤50. Glob instead of recursive ls/find.
• Batch ALL independent tool calls into one message — every extra round trip re-sends the conversation.
• Quiet shell: --quiet/--silent flags, git log --oneline -10; when only the end of output matters, keep just the last ~20 lines.
• Broad sweeps over many files → one Explore subagent, conclusions only. It keeps raw output out of this context, but it inherits the session model and starts on a cold cache, so use it only when the sweep would otherwise cost >10 reads.
• WebSearch/WebFetch/MCP only when local sources cannot answer.

Now

Perform the task below under these rules. If empty, reply exactly "Eco-max ready — pass a task." and stop.

$ARGUMENTS