Conciseness

The body is lean and entirely operational — auth headers, endpoints, two compact code examples, parameter values, error strings, and workflow rules. No section explains concepts Claude already knows, and every token carries non-obvious project-specific information, matching the 'every token earns its place' anchor. Version-sensitive guidance ('new-console API key flow', 'Do not use X-Api-App-Id...') is correctly framed as an explicit do-not-use pattern with its error signature rather than date-conditional instructions.

Actionability

Two complete, copy-paste-ready Python examples (selector and direct provider) with concrete arguments, exact endpoints ('POST https://openspeech.bytedance.com/api/v3/tts/submit'), exact auth headers, and specific parameter semantics ('speech_rate: 0 is normal, 100 is 2x, -50 is 0.5x'). Error messages are mapped to concrete fixes, fully covering the common cases; there is no pseudocode or vague direction, so it exceeds anchor 4.

Workflow Clarity

The Recommended Workflow is a clearly sequenced 7-step process with an explicit validation checkpoint (step 2: user approval of voice naturalness, accent, and speed before the full paid narration) and error-recovery guidance in Troubleshooting (error string → cause → fix). The operation is not destructive/batch, so no cap applies; this matches the anchor for a clear sequence with explicit validation steps and feedback loops for error recovery.

Progressive Disclosure

This is a single-purpose skill with no bundle files and no need for external references; all content (auth, usage, workflow, parameters, troubleshooting, safety) is compact and appropriately inline, and the body is cleanly sectioned with unambiguous headers, satisfying the simple-skill provision for a top score. Nothing here is a monolithic wall of text or content that clearly belongs in a separate file, so it does not fall to anchors 2-4.

Specificity

The description names the domain ('Generate Mandarin and multilingual narration with Volcengine Doubao Speech 2.0') and offers two concrete capabilities (narration generation, 'character-level timestamp metadata for subtitles'), matching the anchor for 1-2 concrete actions without comprehensive coverage. It does not list several specific actions, so it does not reach anchor 4; it clearly exceeds anchor 2 because the actions named are concrete rather than generic.

Completeness

It clearly answers 'what' ('Generate Mandarin and multilingual narration with Volcengine Doubao Speech 2.0') and 'when' with an explicit 'Use when...' clause containing three concrete trigger conditions (Chinese voiceovers, provider preference, timestamp metadata for subtitles). This matches the anchor for explicitly answering both what and when with concrete trigger phrases; anchor 4 would require the 'when' to be less explicit or specific, which is not the case.

Trigger Term Quality

Strong natural keyword coverage including bilingual provider synonyms ('Doubao/Volcengine/火山引擎/豆包 TTS'), 'Chinese voiceovers', 'narration', and 'subtitles' — phrases a user would naturally say. A few natural terms are missing (e.g., 'text-to-speech', 'speech synthesis', 'dubbing'/'配音'), so it fits 'good keyword coverage; a few natural terms missing' rather than the comprehensive anchor 5.

Distinctiveness Conflict Risk

Provider-specific names (Doubao, Volcengine, 火山引擎, 豆包) give it a clear niche with minimal conflict risk, but the generic triggers 'creating Chinese voiceovers' and 'narration ... subtitles' could overlap with other TTS skills, fitting 'mostly distinct; minor overlap risk with closely related skills' rather than the minimal-conflict anchor 5.