Conciseness

The body is mostly lean (curl commands, compact tables, no explanation of concepts Claude already knows), but the zero-impact/no-op guard is restated at least five times — "Zero-impact guarantee... returns silently", "all Feishu functionality is disabled", "Config file absent = mode off. No error, no warning, no log", "This check is always guarded... zero overhead, zero side effects", and "NEVER require Feishu config". This fits 'mostly efficient but includes some unnecessary explanation or could be tightened'; it is not a 4 because the repetition goes beyond minor trimming, and not a 2 because there is no conceptual padding.

Actionability

Provides copy-paste-ready curl commands with complete JSON card payloads, a concrete config schema, and a card-template table mapping each event to title/color/body. Minor gaps keep it below 5: payloads contain unsubstituted placeholders (TITLE, BODY, EVENT_TYPE) with no worked example of a filled-in card, and interactive-mode responses are described but not shown being parsed and returned to the caller.

Workflow Clarity

Steps 1–4 are clearly sequenced with mode-based branching, and Step 4 ("Verify Delivery") plus timeout fallback ("On timeout: Fall back to AUTO_PROCEED behavior") and bridge-unreachable fallback give explicit error handling. It falls short of a 5 because verification is thin — "Check curl exit code. If non-zero, log warning" — with no retry/feedback loop or checklist; it exceeds 3 because checkpoints for failure modes are explicitly present.

Progressive Disclosure

No bundle files exist, and the single-file body (~150 lines) is well-organized with clear sections (Configuration, Workflow, Event Catalog, Key Rules). Most content is appropriately inlined for a utility this size, though the Event Catalog table (10 rows spanning 6 external skills) and the 'Helper Function' markdown template are integration-specific content that could live in a separate reference file — a minor organization gap consistent with a 4 rather than the fully clear split of a 5.

Specificity

"Send notifications to Feishu/Lark" names the domain and one concrete action (sending notifications / status updates), but coverage is not comprehensive — push vs interactive modes, card formats, and event types are only implied. This matches the anchor 'Names domain and 1-2 concrete actions, but not comprehensive'; a 4 would require several specific listed actions like "Extracts text, fills forms, converts pages".

Completeness

The what is explicit ("Send notifications to Feishu/Lark. Internal utility used by other skills, or manually via /feishu-notify") and the when is explicit with concrete trigger phrases ("Use when user says '发飞书', 'notify feishu', or other skills need to send status updates"). This clearly matches the anchor 'Clearly and explicitly answers both what AND when with concrete trigger phrases'; it is not a 4 because the when-clause is already fully explicit, not merely present.

Trigger Term Quality

Includes natural trigger phrases users would actually say — "发飞书", "notify feishu" — plus the Feishu/Lark naming and the internal-caller trigger "other skills need to send status updates". A few natural variations are missing (e.g. "飞书通知", "lark message", "send a message"), which fits 'Good keyword coverage; a few natural terms missing' rather than the comprehensive synonym coverage of a 5.

Distinctiveness Conflict Risk

Feishu/Lark notification is a clear niche with distinct trigger terms ("发飞书", "notify feishu") unlikely to fire for unrelated skills. Minor overlap risk remains with other generic messaging/notification skills (Slack-style notify skills, "send status updates"), fitting 'Mostly distinct; minor overlap risk with closely related skills' rather than the minimal-conflict 5.