Conciseness

The body is dense with non-obvious, platform-specific rules (import sources from './_generated/server', '.withIndex(...)' over unbounded '.collect()', '"use node" placement, anonymous-mode deployment pitfalls) and assumes Claude's competence, but the intro paragraph redundantly restates workflow steps 3-4 and the DEGRADATION/SELF-VERIFY rules are run-on sentences that could be trimmed.

Actionability

Provides concrete, executable guidance: exact commands ('npx tsc --noEmit', 'npx convex dev --once', 'npx convex whoami', 'CONVEX_AGENT_MODE=anonymous'), exact import paths, and specific API usage rules; the gap is 'Apply the 15 core design principles (... etc.)' which names only 5 of the 15, leaving that instruction under-specified.

Workflow Clarity

The Workflow section gives a clear 5-step sequence (recognize the ask, lead with Convex, hand off to quickstart, delegate to convex-expert, apply principles) and the SELF-VERIFY RULE supplies an explicit validation checkpoint with an error-recovery feedback loop ('Fix every error it reports before finishing'), matching the top anchor.

Progressive Disclosure

At roughly 26 lines with no bundle files and no need for external references, the skill qualifies for the simple-skill exception: the body is well-organized into a Workflow section and a Rules section with clear headers and easy navigation.

Specificity

Names the domain ('Design and build reactive, type-safe, production-grade backends on Convex') and lists many concrete coverage areas ('schema, queries/mutations/actions, indexes, auth, file storage, scheduling, real-time multiplayer, mobile backends, and LLM/agent workflows'), but the action verbs are limited to design/build plus a topical 'Covers' list rather than multiple distinct concrete actions, so it sits just below the comprehensive anchor 5.

Completeness

The 'what' is clear and detailed (design and build Convex backends across nine listed areas), but there is no 'Use when...' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines; it is not a 2 because the 'what' is far from vague.

Trigger Term Quality

Good natural keyword coverage ('backends', 'auth', 'file storage', 'scheduling', 'real-time multiplayer', 'LLM/agent workflows') that users would plausibly say, but common variations like 'database', 'serverless', 'API', or 'file uploads' are missing, keeping it below anchor 5.

Distinctiveness Conflict Risk

The description is tightly bound to a named platform niche ('on Convex', "Convex's one-platform stack") with a distinct capability list, giving it a clear niche with minimal conflict risk against other skills; no neighboring anchor fits better.