Conciseness

The body is dense with non-obvious, operational expertise — fingerprint-based loop detection, retry amplification from background calls, cross-vendor thought signatures, the production-derived 3-failure compression circuit breaker — rather than generic concepts Claude already knows. Minor instances of over-explanation (e.g., the rationale for exponential backoff with jitter, "避免客户端同步重试造成二次拥塞") and some long parenthetical sentences could be trimmed, placing it at the 4 rather than the lean 5 anchor.

Actionability

Concrete, specific guidance throughout: a 6-step "错误 → 策略映射表" decision procedure, implementation checklists ("半截工具调用转文字 + 指纹去重", "拼接后重新解析校验参数"), and real-world anchors (Claude Code's consecutive-failure threshold, Google's thoughtSignature). As an instruction-only skill, the absence of code is not penalized; minor gaps (some thresholds remain qualitative, e.g., "连续失败若干次") keep it below fully executable 5-level guidance.

Workflow Clarity

The recovery flow is a clearly sequenced tiered escalation (静默重试 → 降级与接续 → 暴露给用户) with explicit validation checkpoints (re-parse and validate after splice, fingerprint dedup before continuation, duplicate-fingerprint monitoring after takeover) and checklists for the complex processes. Not 5 because some thresholds are left qualitative and the full procedure requires cross-referencing between 核心原则 and 实践模式 sections — minor validation/sequencing gaps matching the 4 anchor.

Progressive Disclosure

Section structure is good (何时使用 / 核心原则 / 实践模式 / 常见陷阱 / 配套代码 / 深度阅读) and references are clearly signaled one level deep, but the referenced paths ("chapter5/provider-failover/", "book/chapter5.md", "book/chapter1.md") do not exist in the bundle — no references/, scripts/, or assets/ directories are present, so the navigation points to dangling targets. This fits the 3 anchor (structure present, references present but not backed by actual files); it is above 2 because nothing is buried and the overview is well-organized.

Specificity

The description lists several concrete capability areas — "覆盖四层故障分类、检测方法、分级恢复策略、熔断上限与流式中断恢复" — going well beyond a bare domain statement. It falls short of the 5 anchor because these are topic areas rather than multiple discrete concrete operations, and 'minor gaps in coverage' matches the 4 anchor better.

Completeness

It explicitly answers both what ("排查或加固 Agent 故障恢复机制…覆盖四层故障分类、检测方法、分级恢复策略、熔断上限与流式中断恢复") and when ("当 Agent 陷入无限循环、流式响应中途断开、上下文溢出…时使用" with seven concrete trigger scenarios). This mirrors the 5 anchor's structure of explicit 'what' plus concrete 'Use when…' triggers; it is clearly above the 4 anchor, whose 'when' is present but less specific.

Trigger Term Quality

Good coverage of natural phrases a user would actually say: "无限循环", "流式响应中途断开", "上下文溢出", "限流过载", "重试与熔断策略". A few natural variations are missing (e.g., 超时/timeout, 死循环, token 触顶), which fits the 'good keyword coverage; a few natural terms missing' anchor rather than the comprehensive 5.

Distinctiveness Conflict Risk

It occupies a clear niche — agent failure recovery: circuit breaking, streaming resumption, cross-vendor trajectory takeover, death-spiral prevention — with triggers (无限循环, 熔断, 跨厂商接管) unlikely to fire for unrelated skills. Minimal conflict risk, matching the 5 anchor; not 4 because the trigger set is highly distinctive rather than overlapping with close cousins.