Conciseness

The body is lean — terse phase descriptions, a compact depth table, and a workspace tree with no explanation of concepts Claude already knows. It drops below the lean/efficient anchor 5 because the 'Alternative: scripted workflow' section carries a machine-specific absolute path ('/Users/mi/claude-workspace/...') and somewhat verbose notes that could be trimmed.

Actionability

Gives concrete commands ('Run `date +%Y-%m-%d`', 'Spawn one sub-agent per angle in a single message') and specific file paths plus a copy-ready workflow invocation block. It is not a 5 because the core executable detail (sub-agent prompt template, sources, report format) is offloaded to referenced files that are not present in the bundle, leaving minor gaps.

Workflow Clarity

A clearly sequenced Step 0 → Phases 1-5 pipeline with explicit validation checkpoints: Phase 4 reflect/gap-check feeds back into targeted delta-query sub-agents, and Phase 5 includes a skeptical-reviewer critique pass — a genuine validate→fix→retry feedback loop for a batch operation.

Progressive Disclosure

Good structure with clearly signaled one-level-deep references ('[reference/subagent-prompt.md]', '[reference/sources.md]', '[reference/report.md]') and content appropriately split by phase. It is not 5 because those referenced files do not exist in the bundle, so the navigation targets do not resolve.

Specificity

Names the domain plus several concrete mechanisms — 'parallel sub-agents', 'built-in tools only (WebSearch/WebFetch + free APIs, no keys)', 'multi-source investigation with a cited report'. It lists multiple specific actions but they all describe one research capability rather than several distinct ones, so it sits just below the comprehensive anchor 5.

Completeness

Explicitly answers both what ('Deep research on any topic using parallel sub-agents...') and when ('Use when the user asks for a thorough multi-source investigation with a cited report'), plus explicit negative boundary triggers ('NOT for simple lookups', 'NOT for academic literature surveys').

Trigger Term Quality

Gives comprehensive natural trigger phrases with synonyms in two languages — 'deep research', '帮我全面研究一下', '多方求证', '写一份调研报告' — matching the comprehensive-coverage-with-synonyms anchor; no file extensions apply to this skill type.

Distinctiveness Conflict Risk

Clear niche (multi-source cited investigation) with explicit disambiguation against adjacent skills — 'NOT for simple lookups (single WebSearch suffices)' and 'NOT for academic literature surveys (use auto-research skill instead)' — giving minimal conflict risk.