fix: allow empty provider secrets to attempt requests

crates/aether-model-fetch/src/transport.rs

@@ -95,8 +95,12 @@ pub async fn build_standard_models_fetch_execution_plan(
                 .ok_or_else(|| {
                     "Rust models fetch auth resolution is not supported for this key".to_string()
                 })?;
-        protected_headers.push(auth_header_name.clone());
-        headers.insert(auth_header_name.clone(), auth_header_value.clone());
+        insert_non_empty_auth_header(
+            &mut headers,
+            &mut protected_headers,
+            &auth_header_name,
+            &auth_header_value,
+        );
         headers = apply_fetch_header_rules(transport, headers, &protected_headers)?;
         ensure_upstream_auth_header(&mut headers, &auth_header_name, &auth_header_value);
     } else {
@@ -181,6 +185,7 @@ pub async fn build_gemini_cli_load_code_assist_plan(
 ) -> Result<ExecutionPlan, String> {
     let authorization = resolve_bearer_or_oauth_header_auth(runtime, transport)
         .await?
+        .filter(|(_, value)| !value.trim().is_empty())
         .ok_or_else(|| "GeminiCLI loadCodeAssist requires bearer or OAuth auth".to_string())?;
 
     let mut headers = BTreeMap::from([
@@ -188,8 +193,13 @@ pub async fn build_gemini_cli_load_code_assist_plan(
         ("accept-encoding".to_string(), "identity".to_string()),
         ("content-type".to_string(), "application/json".to_string()),
     ]);
-    headers.insert(authorization.0.clone(), authorization.1.clone());
-    let protected_headers = vec![authorization.0];
+    let mut protected_headers = Vec::new();
+    insert_non_empty_auth_header(
+        &mut headers,
+        &mut protected_headers,
+        &authorization.0,
+        &authorization.1,
+    );
     headers = apply_fetch_header_rules(transport, headers, &protected_headers)?;
 
     build_execution_plan(
@@ -225,8 +235,7 @@ pub async fn build_vertex_models_fetch_execution_plan(
     let mut headers = standard_models_fetch_headers(api_format, &transport.provider.provider_type);
     let mut protected_headers = Vec::<String>::new();
     if let Some((name, value)) = auth_header {
-        protected_headers.push(name.clone());
-        headers.insert(name.clone(), value.clone());
+        insert_non_empty_auth_header(&mut headers, &mut protected_headers, &name, &value);
         headers = apply_fetch_header_rules(transport, headers, &protected_headers)?;
         ensure_upstream_auth_header(&mut headers, &name, &value);
     } else {
@@ -472,6 +481,22 @@ fn append_query_param(mut url: String, key: &str, value: &str) -> String {
     url
 }
 
+fn insert_non_empty_auth_header(
+    headers: &mut BTreeMap<String, String>,
+    protected_headers: &mut Vec<String>,
+    name: &str,
+    value: &str,
+) {
+    let name = name.trim();
+    let value = value.trim();
+    if name.is_empty() || value.is_empty() {
+        return;
+    }
+
+    protected_headers.push(name.to_string());
+    headers.insert(name.to_string(), value.to_string());
+}
+
 #[cfg(test)]
 mod tests {
     use aether_contracts::{ExecutionPlan, ExecutionResult, ProxySnapshot};

crates/aether-provider-transport/src/auth.rs

@@ -236,7 +236,7 @@ pub fn resolve_local_openai_bearer_auth(
     }
     let secret = resolved_local_secret(transport)?;
 
-    Some(("authorization".to_string(), format!("Bearer {secret}")))
+    Some(("authorization".to_string(), bearer_auth_value(secret)))
 }
 
 pub fn resolve_local_standard_auth(
@@ -247,7 +247,7 @@ pub fn resolve_local_standard_auth(
 
     match auth_type.as_str() {
         "api_key" => Some(("x-api-key".to_string(), secret.to_string())),
-        "bearer" => Some(("authorization".to_string(), format!("Bearer {secret}"))),
+        "bearer" => Some(("authorization".to_string(), bearer_auth_value(secret))),
         _ => None,
     }
 }
@@ -260,7 +260,7 @@ pub fn resolve_local_gemini_auth(
 
     match auth_type.as_str() {
         "api_key" => Some(("x-goog-api-key".to_string(), secret.to_string())),
-        "bearer" => Some(("authorization".to_string(), format!("Bearer {secret}"))),
+        "bearer" => Some(("authorization".to_string(), bearer_auth_value(secret))),
         _ => None,
     }
 }
@@ -291,7 +291,21 @@ pub(crate) fn resolve_local_auth_type_for_transport_format(
 
 fn resolved_local_secret(transport: &GatewayProviderTransportSnapshot) -> Option<&str> {
     let secret = transport.key.decrypted_api_key.trim();
-    (!secret.is_empty() && secret != PLACEHOLDER_API_KEY).then_some(secret)
+    if !secret.is_empty() && secret != PLACEHOLDER_API_KEY {
+        Some(secret)
+    } else if transport.key.decrypted_auth_config.is_some() {
+        None
+    } else {
+        Some("")
+    }
+}
+
+fn bearer_auth_value(secret: &str) -> String {
+    if secret.is_empty() {
+        String::new()
+    } else {
+        format!("Bearer {secret}")
+    }
 }
 
 #[cfg(test)]
@@ -465,16 +479,31 @@ mod tests {
     }
 
     #[test]
-    fn local_standard_auth_rejects_placeholder_secret() {
-        assert!(resolve_local_standard_auth(&sample_transport()).is_none());
+    fn local_standard_auth_keeps_header_shape_for_placeholder_secret() {
+        assert_eq!(
+            resolve_local_standard_auth(&sample_transport()),
+            Some(("authorization".to_string(), String::new()))
+        );
     }
 
     #[test]
-    fn local_standard_auth_rejects_empty_secret() {
+    fn local_standard_auth_keeps_header_shape_for_empty_secret() {
         let mut transport = sample_transport();
         transport.key.auth_type = "api_key".to_string();
         transport.key.decrypted_api_key = String::new();
 
+        assert_eq!(
+            resolve_local_standard_auth(&transport),
+            Some(("x-api-key".to_string(), String::new()))
+        );
+    }
+
+    #[test]
+    fn local_standard_auth_defers_to_auth_config_when_raw_secret_is_empty() {
+        let mut transport = sample_transport();
+        transport.key.decrypted_auth_config =
+            Some(r#"{"access_token":"cached-token"}"#.to_string());
+
         assert!(resolve_local_standard_auth(&transport).is_none());
     }
 

crates/aether-provider-transport/src/claude_code/auth.rs

@@ -3,6 +3,6 @@ use super::super::snapshot::GatewayProviderTransportSnapshot;
 use super::super::supports_local_oauth_request_auth_resolution;
 
 pub fn supports_local_claude_code_auth(transport: &GatewayProviderTransportSnapshot) -> bool {
-    resolve_local_standard_auth(transport).is_some()
+    resolve_local_standard_auth(transport).is_some_and(|(_, value)| !value.trim().is_empty())
         || supports_local_oauth_request_auth_resolution(transport)
 }