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fix: always send maxOutputTokens; default 16000

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Unset does not mean the model's maximum — the provider fills in its own, and
Bedrock's is 4096 (measured: converse with no inferenceConfig on
us.anthropic.claude-opus-5 returns stopReason=max_tokens at exactly 4096).

A 30-cell diagram is ~3000 tokens of XML, so anything larger arrived as truncated
JSON and nothing reached the canvas. Small diagrams fitted, which made it look
intermittent.
This commit is contained in:
dayuan.jiang
2026-08-10 17:00:54 +09:00
parent fd758b9e87
commit 5a4c0cfcc3
2 changed files with 6 additions and 3 deletions
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6
app/api/chat/route.ts
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@@ -493,9 +493,9 @@ IMPORTANT: The "Current diagram XML" is the SINGLE SOURCE OF TRUTH for what's on
const result = streamText({
model,
abortSignal: req.signal,
...(process.env.MAX_OUTPUT_TOKENS && {
maxOutputTokens: parseInt(process.env.MAX_OUTPUT_TOKENS, 10),
}),
// Must be sent: unset means the provider's own default, and Bedrock's is 4096 —
// enough for a small diagram, so larger ones were cut off mid-attribute.
maxOutputTokens: Number(process.env.MAX_OUTPUT_TOKENS) || 16000,
stopWhen: stepCountIs(5),
// Repair truncated tool calls when maxOutputTokens is reached mid-JSON
experimental_repairToolCall: async ({ toolCall, error }) => {