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fix(llm-client): detect native sglang context-overflow messages #426

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fix(llm-client): detect native sglang context-overflow messages #426

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11 changes: 11 additions & 0 deletions crates/libsy-llm-client/src/backend.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@ const OPENAI_OVERFLOW_PHRASES: &[&str] = &[
"context length is only",
"please reduce the length of the input",
"exceeds the maximum allowed input length",
"exceeds the maximum allowed length",
"is longer than the model's context length",
];

// Anthropic has no structured `error.code`, so detection is phrase-based only.
Expand Down Expand Up @@ -339,6 +341,15 @@ mod tests {
assert!(backend.is_context_overflow(
r#"{"error":{"message":"Input length 877338 exceeds the maximum allowed input length of 639968 tokens","code":"400"}}"#
));
// Native SGLang: top-level envelope (no `error` key), caught by the raw-body phrase match.
// KV-pool rejection (managers/utils.py) and declared-context rejection
// (tokenizer_manager.py); both stable across v0.5.15-v0.5.17.
assert!(backend.is_context_overflow(
r#"{"object":"error","message":"Input length (700001 tokens) exceeds the maximum allowed length (536826 tokens). Use a shorter input or enable --allow-auto-truncate.","type":"BadRequestError","param":null,"code":400}"#
));
assert!(backend.is_context_overflow(
r#"{"object":"error","message":"The input (12345 tokens) is longer than the model's context length (8192 tokens).","type":"BadRequestError","param":null,"code":400}"#
));
}

#[test]
Expand Down