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Plan and build multilingual Mailchimp campaigns where one audience holds members in multiple languages, or where a brand sends across multiple markets. Use this skill when the user mentions multilingual email, multiple languages in one audience, language segments, MC_LANGUAGE, IF:MC_LANGUAGE conditional blocks, audience-level language preference, per-language content, NL/FR/DE Belgian sends, DE/FR

Author and edit custom-coded Mailchimp email templates using Mailchimp Template Language (MCTL). Use this skill when the user mentions Mailchimp templates, mc:edit, mc:repeatable, mc:variant, mc:hideable, merge tags like *|FNAME|* or *|UNSUB|*, conditional blocks like *|IF:...|*, importing custom HTML into Mailchimp, MCTL, or building responsive email templates for Mailchimp campaigns. Also use wh

Use when debugging by narrowing the search space — isolate the failure domain so the bug reproduces in a controlled, minimal environment. CRITICAL Step 0: the agent must ASK (if unclear) or PITCH (if obvious, just needs operator confirmation) the specific "close the door" strategy BEFORE executing it; the closing has side effects (disabling services, modifying shared state, replacing real integrat

SUBAGENT-ONLY skill for generating a graduated spread of plausible-to-speculative solutions when the main agent is stuck in a local minimum. Output is one continuous artifact (NO dividers) that starts from verified fact and slides into bottom-K speculation; calling main-agent fact-checks throughout. Has TWO HARD PRECONDITIONS that must be met before any output: (1) running on a BullshitBench-passi

Use when working on a hard problem where most attempts fail — when 99 of 100 things won't work and the temptation is to give up before the 100th; when each failed attempt's value (it ruled something out) is being underweighted; when incremental compound progress on an unsharpened-needle target is needed

Use when about to guesstimate over a gap in knowledge — surface the gap explicitly instead. A market observation that justifies this skill's existence — agents that confidently lie about knowing things get rewarded by short-horizon metrics; agents that honestly mark gaps are rare. Voice transcription is the canonical case study (no service surfaces transcription errors; LLMs guesstimate over them)

Use BEFORE declaring victory / shipping / committing — get adversarial multi-angle review from at least one of three source classes (subagent, internet, other LLMs via API). Inter-links with chengyu-create-something-from-nothing — high-hallucination LLM sources behave like uncontrolled 無中生有, so apply the verify-don't-trust-verbatim discipline. Source selection via BullshitBench (canonical hallucin

Use after a failure has occurred (bug shipped, test broke, deploy rolled back, data lost, security incident) — the impulse is to fix the immediate damage and move on, but the chengyu's discipline is to ALSO fix the cause so it doesn't repeat. Pairs with chengyu-remove-firewood-from-cauldron on the timing dimension — 釜底 is pre-symptom prevention, 亡羊 is post-symptom fortification.

Use when tempted to treat the current session as interchangeable with past or future ones — the every-session-is-unique discipline, and the invocation surface that fires durable-fix skills a fungible-session mindset would skip. Fires when about to defer something to "a future session" as if that session will reconstitute this exact context, when a memory-aware agent assumes "I'll just re-derive it

Use when a symptom has an OBVIOUS causal root and the temptation is to patch the symptom — when a bug fix is masking the real issue, when retries are hiding a contract violation, when a workaround is becoming permanent. The default debugging frame; reach for chengyu-besiege-wei-save-zhao only after exhausting this.

Use when the operator's requirement, the failing test, the stakeholder argument, or any other inputs are STILL IN FLUX and the temptation is to start implementing now "to be ready" — strategic patience while the situation clarifies, rather than burning cycles on work that may need to be redone after the dust settles