Conciseness

The core operational content (state machine, state-file schema, role pointers, escalation criteria) is dense and earns its tokens, but there is real padding: the '为什么要盲测试' rationale section, and chatty commentary like '不是走流程，是这一步存在的全部意义' and '谁也说不准', are motivational prose Claude does not need to execute the workflow. It fits 'mostly efficient but includes some unnecessary explanation or could be tightened' rather than 2, because the excess is commentary around genuinely tight instructions, not redundant concept explanation throughout.

Actionability

Concrete elements exist — the state file path `markdown/.feature_implement_state.json` with a full JSON example, deliverable filenames `markdown/{功能名}_用户手册.md`, explicit tester-prompt isolation rules, and measurable escalation criteria ('同一个问题被打回两次以上', '测试报告和上一轮几乎一样'). But the key execution details are delegated away: '三个角色的详细职责、输入输出格式、产出要求都写在 agents/ 目录下' — and those agents/developer.md, agents/reviewer.md, agents/tester.md files do not exist in the bundle, leaving the per-role input/output formats as missing key details. This keeps it below 4 despite otherwise executable guidance.

Workflow Clarity

The multi-step process is exceptionally sequenced: an ASCII state machine diagram, explicit gates ('review 通过' before testing, '测试失败' back to loop A), per-iteration history recording, a test_suite_written reuse rule to prevent rework, and explicit stall detection with defined escalation conditions. Feedback loops and error-recovery paths (test failure → targeted bug fix → re-run new + existing tests) are the core of the document, matching the top anchor.

Progressive Disclosure

The in-body structure and signaling are good — sections are clear, references/postgres-extension.md exists and is properly one level deep — but three of the four referenced files (agents/developer.md, agents/reviewer.md, agents/tester.md) are absent from the bundle, breaking the disclosure chain exactly where the bulk of the role instructions is supposed to live. A reader following '进入对应阶段时去读' hits nonexistent paths, so navigation fails at the core content despite good organization; this sits below 3 ('references present but not clearly signaled') because the problem is not signaling but broken reference targets.

Specificity

The description lists the full concrete action pipeline — '开发、代码 review、测试用例编写与执行，循环迭代直到测试通过，最终产出用户手册与实现总结文档' — covering development, review, test writing/execution, iteration, and concrete deliverables saved to markdown/. It falls short of a 5 only because the pipeline actions are stated at a fairly high level ('开发', '代码 review' are generic verbs) and the trigger section restates near-duplicate scenarios, adding padding rather than new specificity.

Completeness

Explicitly answers both what (end-to-end implement: dev + review + test + iterate until pass, producing user manual and implementation summary in markdown/) and when ('触发条件：用户提供了功能设计文档…+ 源码目录', extended environment cases like PostgreSQL/MySQL plugin development, and an explicit non-applicability list). Both halves are concrete and clearly signaled.

Trigger Term Quality

Extensive natural trigger phrasing users would actually say: '实现这个功能', '开发这个功能', '把这个设计文档变成代码', '做这个功能的开发+测试', '完整实现并测试', '端到端开发', '独立测试', 'black-box 测试', plus plain-language variants ('帮我把这个功能做出来'). Covers synonyms, informal phrasings, and negative triggers ('不适用于：只是要求"写一个脚本"…'), which is comprehensive.

Distinctiveness Conflict Risk

Clear niche — design-doc-driven '开发 ⇄ Review' loop with blind testing ('测试者不预先看代码') — that no generic skill covers, and the explicit exclusion list ('不适用于…纯粹的代码评审…纯粹的测试用例编写…快速修一个 bug') removes the main overlap risks with pure code-review or pure test-writing skills.