fix(mistral): use truncateUtf16Safe for error text truncation

lsr911 · claude · lsr911 · commit c8ef1cc154fa · 2026-07-09T16:09:18.000+08:00
Replace naive .slice(0, maxChars) with truncateUtf16Safe() in
truncateErrorText() to prevent surrogate pair splitting in
Mistral provider error messages shown to users.

Co-Authored-By: Claude &lt;noreply@anthropic.com&gt;
diff --git a/packages/ai/src/providers/mistral.ts b/packages/ai/src/providers/mistral.ts
@@ -1,5 +1,6 @@
 // Mistral provider adapts Mistral streams and tool calls to the runtime.
 import { HTTPClient, Mistral, type Fetcher } from "@mistralai/mistralai";
+import { truncateUtf16Safe } from "@openclaw/normalization-core/utf16-slice";
 import type {
   ChatCompletionStreamRequest,
   ChatCompletionStreamRequestMessage,
@@ -295,7 +296,7 @@ function truncateErrorText(text: string, maxChars: number): string {
   if (text.length <= maxChars) {
     return text;
   }
-  return `${text.slice(0, maxChars)}... [truncated ${text.length - maxChars} chars]`;
+  return `${truncateUtf16Safe(text, maxChars)}... [truncated ${text.length - maxChars} chars]`;
 }
 
 function safeJsonStringify(value: unknown): string {

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,6 @@`
`1`	`1`	`// Mistral provider adapts Mistral streams and tool calls to the runtime.`
`2`	`2`	`import { HTTPClient, Mistral, type Fetcher } from "@mistralai/mistralai";`
	`3`	`+import { truncateUtf16Safe } from "@openclaw/normalization-core/utf16-slice";`
`3`	`4`	`import type {`
`4`	`5`	`ChatCompletionStreamRequest,`
`5`	`6`	`ChatCompletionStreamRequestMessage,`
`@@ -295,7 +296,7 @@ function truncateErrorText(text: string, maxChars: number): string {`
`295`	`296`	`if (text.length <= maxChars) {`
`296`	`297`	`return text;`
`297`	`298`	`}`
`298`		- return `${text.slice(0, maxChars)}... [truncated ${text.length - maxChars} chars]`;
	`299`	+ return `${truncateUtf16Safe(text, maxChars)}... [truncated ${text.length - maxChars} chars]`;
`299`	`300`	`}`
`300`	`301`
`301`	`302`	`function safeJsonStringify(value: unknown): string {`