Tighten block validation: header text <=150 chars, section fields <=10 - #468
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Slack's Block Kit enforces these limits at the API level; enforcing them client-side gives callers an earlier, clearer error instead of a rejected API response. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
opaliukh
approved these changes
Jul 30, 2026
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Slack's Block Kit enforces these limits at the API level; enforcing them client-side gives callers an earlier, clearer error instead of a rejected API response. Small clean-up work to be done after more implementations.
Changes:
Header block enforces a char limit of 150, not 3000
Section block enforces a limit of fields to 10