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Three additions to the databricks-apps Generic Guidelines, each pinned to
a real failure pattern observed in the apps-mcp-evals nightly:
1. **AppKit API — consult `appkit docs` first.** Mode-D fingerprint:
tonight's prod nightly (run 456555456546311) had 14 catastrophic
build flips; 12/14 were cb_* (cookbook) prompts and the failures were
typecheck errors against AppKit 0.20.3 (`createApp({setup:...})` when
the real config doesn't accept `setup`, etc.). Tracked in LKB-12465.
2. **Playwright APIs — use only documented ones.** Mode-C smoke fixture:
`serving_chat` smoke spec called `page.getByLabelText` (React Testing
Library, not Playwright) → `TypeError: ... is not a function`. Validate
step fails before any UI assertion. Easy nudge.
3. **Smoke query payload size.** `price_prediction_tool` smoke failed with
`Event exceeds max size of 1048576 bytes` + `ERR_ABORTED` because the
underlying analytics query returned a multi-MB row dump. Smoke specs
then can't find the elements that were never rendered. LIMIT 500 or
aggregate.
Each guideline is short and quotes the exact failure signature so the
agent can pattern-match in future generations.
Co-authored-by: Isaac
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MarioCadenas
approved these changes
May 7, 2026
keugenek
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@databricks/appkit or @databricks/appkit-ui version in package.json
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Summary
AppKit version pinning (LKB-12614): never override
@databricks/appkitversion inpackage.json—databricks apps initsets the correct version. Agent was writing stale versions from training data (0.11.0 when latest is 0.31.0).Plus: smoke-test selector guidance (use Playwright locator APIs, not React Testing Library), data-size cap for analytics payloads.
Supersedes PR #65 (which covered only the TypeScript-casts bullet). Mario Cadenas's review feedback from #65 is incorporated (auto-gen queryKey files carve-out, warehouse-unavailable
unknowncase).Documentation safety checklist
Co-authored-by: Isaac