fix(slack): accept scalar checkbox values in List responses

[TheodoreSpeaks]

Slack Lists can return a scalar checkbox: false after a successful row write. The existing response schema accepts only boolean arrays, causing Create List Item to report failure after creating the row and Read List Items to reject that row afterward.

Accept boolean and boolean-array checkbox responses without changing the provider value, retain strict rejection of malformed values, and update generated output metadata and docs. Regression coverage exercises create, list, and info response transforms for both valid formats.

Validation: reproduced scalar false/true failures before the fix; all 64 focused Lists, Canvas, and Slack resource-block tests pass afterward. Biome, API validation audit, generated metadata/docs checks, and diff checks pass. No local TypeScript check was run.

Live staging: updated custom-bot permissions now work; List create, rename, and empty-list schema reads pass. Row creation/read exposed this bug. Full row CRUD and test-row cleanup remain pending deployment of this fix. Targets staging; not merged or deployed by this PR creation.

[vercel]

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 24, 2026 6:00pm UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; no actionable regression was established.

Summary

The PR accepts scalar booleans as well as boolean arrays in Slack List checkbox responses without changing the returned value.

• Updates the shared response schema used by create, list, and info.
• Aligns output metadata and documentation with the mixed response shape.
• Adds tests for both valid shapes and malformed values.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Slack List row response] --> B[Shared field response schema]
  B --> C{Checkbox value}
  C -->|Boolean or boolean array| D[Preserve value in tool output]
  C -->|Malformed| E[Reject response]

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[cubic-dev-ai]

No issues found across 5 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}