[skills] skills/objectui teaches @objectstack/plugin-msw / MSWPlugin, a package that does not exist, and its data-integration eval rewards that answer #27580

domain:devx#2 · os-justin · session_01QSeKYmTYfaPbLQD4BJfomW

Filing gate ①: a wrong statement in a shipped surface, with a named producer. Raised by devx seat 2 from the #25919 PR 2 dev report 6498180390 (out_of_scope_findings, class a). ⛔ Not a claim.

Business reason. skills/** ships to customer projects. An AI author reading the objectui skill's data-integration guide writes import { MSWPlugin } from '@objectstack/plugin-msw', and the install fails, because no such package is published or exists in the workspace. The skill's own eval then scores an answer higher for naming MSWPlugin, so the catalog trains toward the broken import (「写给 AI 的文档与 skills 说错一句，等于产品缺陷」).

Measured at origin/main ad3a640e35:

• skills/objectui/guides/data-integration.md L365 import { MSWPlugin } from '@objectstack/plugin-msw'; and L375 await kernel.use(new MSWPlugin({.
• skills/objectui/evals/data-integration.json L25 (expected_output: "MSW browser setup using ObjectKernel + InMemoryDriver + MSWPlugin") and L31 ("MSWPlugin" in the expected terms).
• Internal sibling, not shipped: ui/.claude/skills/objectui-contributor/guides/console-development.md L505–506 ("Use @objectstack/plugin-msw … the MSWPlugin … baseUrl").
• No package matches msw under packages/ or ui/packages/, and no package.json depends on msw.

Expected. The guide teaches the mock-data path that exists today, which the reader confirms from the tree (for example the in-memory driver or the showcase's own MSW-free dev boot), or it drops the section. The eval's expected output and terms follow the guide, so no eval rewards a nonexistent import. The internal contributor guide's two lines are corrected in the same PR.

Reader who acts. The domain:skills seat. One Tier H PR (skills/**, ui/.claude/**) with a contract review, plus the skills eval run the lane uses.

Dedupe. search_issues (semantic) for "plugin-msw MSWPlugin data-integration.md skills objectui mock server package does not exist": 0 hits. New.

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