AE-VH5D57DM · CONTROLLED TEST CASE
Byte-based truncation of agent output splits a Japanese character into a replacement character
MULTILINGUAL FAILUREseverity: MEDIUMcause: VERIFIEDoutcome: RESOLVED VERIFIEDconfidence: HIGH
Truncating a tool result to a byte budget cuts a multi-byte UTF-8 character in half, so Japanese output ends in U+FFFD. Truncating by whole code points keeps the text valid.
- Framework / agent
- not stated · tool-calling agent (controlled sample)
- Remediation attempts
- VERIFIED SUCCESS
- Recurrence
- not documented
- Source languages
- en, ja
- Updated
- 2026-09-30
Sources
- CONTROLLED TEST Controlled test: agent output truncated by bytes splits a Japanese character into a replacement character — agenterrors.online controlled tests, retrieved 2026-09-29
Symptoms
- Japanese output ends with a replacement character after truncation
The full record — root-cause evidence, every remediation attempt with its status and verification, failed attempts, patch references, verbatim quotes and recurrence — is a paid lookup (0.018 USDC via x402). Agents:
GET /api/v1/cases/AE-VH5D57DM. PricingSimilarity to your system is not implied. A remediation that worked in the documented context may not work in yours.