codetether-agent 4.5.7

A2A-native AI coding agent for the CodeTether ecosystem
Documentation 
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//! Provider error classification and normalization.

/// Normalizes provider aliases (zhipuai/z-ai -> zai).
pub fn normalize_provider_alias(provider_name: &str) -> &str {
    if provider_name.eq_ignore_ascii_case("zhipuai") || provider_name.eq_ignore_ascii_case("z-ai") {
        "zai"
    } else {
        provider_name
    }
}

/// Normalizes a model reference for use as a key in the attempted models set.
pub fn smart_switch_model_key(model_ref: &str) -> String {
    model_ref.trim().to_ascii_lowercase()
}

/// Classifies provider errors as retryable (rate limit, timeout, 5xx) vs permanent.
pub fn is_retryable_provider_error(err: &str) -> bool {
    let normalized = err.to_ascii_lowercase();
    let transient_status_codes = [
        " 429 ", " 500 ", " 502 ", " 503 ", " 504 ", " 520 ", " 521 ", " 522 ", " 523 ", " 524 ",
        " 525 ", " 526 ", " 529 ", " 598 ", " 599 ", " 798 ",
    ];
    let non_retryable_status_codes = [" 400 ", " 401 ", " 403 ", " 404 ", " 422 "];
    let markers = [
        "429",
        "rate limit",
        "too many requests",
        "quota exceeded",
        "service unavailable",
        "temporarily unavailable",
        "bad gateway",
        "gateway timeout",
        "timed out",
        "timeout",
        "connection reset",
        "connection refused",
        "network error",
        "unknown api error",
        "api_error",
        "unknown error",
        "protocol error code 469",
        "no text payload",
        "context length exceeded",
        "maximum context length",
    ];

    if non_retryable_status_codes
        .iter()
        .any(|c| normalized.contains(c))
    {
        return false;
    }

    markers.iter().any(|m| normalized.contains(m))
        || transient_status_codes
            .iter()
            .any(|c| normalized.contains(c))
}