In-app AI-chat tools used bare zod schemas, so when the model dropped a
required arg (typically pageId) in a parallel/batch tool call, the AI SDK
forwarded zod's raw "expected string, received undefined" text to the model
— not actionable. Add a centralized modelFriendlyInput(shape) wrapper that
keeps the exact JSON Schema contract (required/description/constraints via
z.toJSONSchema draft-7) but replaces the raw zod text with a message naming
each missing/invalid parameter and reminding the model not to drop ids like
pageId in parallel batches. No value is guessed/backfilled (cf. #159).
Applied to every in-app tool: the sharedTool() builder and all inline
inputSchema in ai-chat-tools.service.ts, plus public-share-chat-tools.service.ts.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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