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Mark Fogle
4640d6304e
The "Generative UI: useComponent" cell (gen-ui-tool-based) went red on mastra
the moment OSS-381 took it out of not_supported: the D5 gen-ui-custom probe
sent the *haiku* prompt and hunted for a haiku card, but mastra's demo is the
LGP-style `useComponent` chart demo (render_pie_chart / render_bar_chart) with
no haiku tool — so the assistant bubble came back empty ("haiku card
[data-testid=copilot-assistant-message] rendered but has no text content").
Root cause: the probe's CHART_INTEGRATIONS allowlist in
harness/src/probes/scripts/d5-gen-ui-custom.ts omitted mastra, so
isChartIntegration("mastra") was false and it took the haiku branch. mastra's
gen-ui-tool-based page registers render_pie_chart / render_bar_chart via
useComponent exactly like langgraph-python and google-adk.
- Add "mastra" to CHART_INTEGRATIONS so the probe sends the pie-chart prompt
and asserts the donut SVG + "pie"/"chart" follow-up tokens.
- Add aimock/d6/mastra/gen-ui-custom.json (mirrors langgraph-python's, context:
mastra; the pie schema is identical — {title, description, data:[{label,value}]})
so the cell is deterministic under aimock replay instead of falling through to
the live upstream.
- Repoint the probe unit test's haiku-empty-card case from "mastra" to "agno"
(a genuine haiku integration) now that mastra is a chart integration.
Not a v1-bridge streaming regression — a harness/fixture gap exposed when the
cell was un-suppressed. Harness unit tests not run locally (sparse showcase
checkout has no vitest); logic-only changes.
--no-verify: sparse showcase checkout has no monorepo lefthook/commitlint binaries.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>