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feat(app): throw helpful error when callServerTool is called with a string (#449)

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Users frequently call callServerTool("tool_name", args) instead of the
correct callServerTool({ name: "tool_name", arguments: args }), resulting
in a silent/confusing failure. Detect this and throw immediately with
a message that shows the correct call shape.

Also fixes the incorrect example in examples/pdf-server/README.md that
demonstrated this same wrong usage pattern.

Fixes #386

https://claude.ai/code/session_01GqAyN4Ux7svWoU2HqsSLZF

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Olivier Chafik 2026-02-13 21:05:21 +00:00 • committed by GitHub
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5
examples/pdf-server/README.md
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@ -63,7 +63,10 @@ On some host platforms, tool calls have size limits, so large PDFs cannot be sen
```typescript
// Load in chunks with progress
while (hasMore) {
const chunk = await app.callServerTool("read_pdf_bytes", { url, offset });
const chunk = await app.callServerTool({
name: "read_pdf_bytes",
arguments: { url, offset },
});
chunks.push(base64ToBytes(chunk.bytes));
offset += chunk.byteCount;
hasMore = chunk.hasMore;