Function transform_messages

crates/opencode-provider/src/transform.rs:619–645

(
    messages: &mut Vec<Message>,
    provider_type: ProviderType,
    model_id: &str,
    supported_modalities: &[Modality],
    npm: &str,
    provider_id: &str,
)

// ---------------------------------------------------------------------------

pub fn transform_messages(
    messages: &mut Vec<Message>,
    provider_type: ProviderType,
    model_id: &str,
    supported_modalities: &[Modality],
    npm: &str,
    provider_id: &str,
) {
    unsupported_parts(messages, supported_modalities);
    normalize_messages(messages, provider_type, model_id);

    // TS: apply caching when the model is anthropic/claude/bedrock, but NOT gateway.
    // Checks: providerID == "anthropic", api.id contains "anthropic"/"claude",
    //         model.id contains "anthropic"/"claude", or npm == "@ai-sdk/anthropic"
    let id_lower = model_id.to_lowercase();
    let pid_lower = provider_id.to_lowercase();
    let is_anthropic_like = pid_lower == "anthropic"
        || id_lower.contains("anthropic")
        || id_lower.contains("claude")
        || npm == "@ai-sdk/anthropic";
    if is_anthropic_like && npm != "@ai-sdk/gateway" {
        apply_caching(messages, provider_type);
    }

    // Remap providerOptions keys from stored providerID to expected SDK key
    remap_provider_options(messages, npm, provider_id);
}

/// Remap providerOptions keys from the stored `provider_id` to the expected SDK key.
/// Matches the TS logic that remaps `providerOptions[providerID]` -> `providerOptions[sdkKey]`.