Struct ApiCallError 

pub struct ApiCallError {
    pub status_code: Option<u16>,
    pub provider_code: Option<String>,
    pub message: String,
    pub response_body: Option<String>,
    pub request_id: Option<String>,
    pub retry_after_ms: Option<u64>,
    pub is_retryable: bool,
}

What a failed API call observed — the field set of the AI SDK’s APICallError (statusCode / responseBody), which this project’s error taxonomy mirrors (docs/internal/vercel-research/07-kernel-infrastructure.md).

Carried by AiMuxError::ApiCall alone. There are no per-status variants: a 401, 404 or 429 is an ApiCall error whose classification is read from status_code, exactly as the AI SDK reads APICallError.statusCode. Transport failures (connection reset, DNS, body read) are ApiCall errors too — no response arrived, so status_code is None and is_retryable is true, exactly as the AI SDK’s handleFetchError builds an APICallError with no statusCode and isRetryable: true. message holds the provider’s text only — the status is a field, never baked into the string; Display composes the human-readable form from the fields at print time, so nothing downstream has to parse it back out.

APICallError fields not carried in this round: url / requestBodyValues / responseHeaders (the request context is not available at the error-construction sites today; all fields are #[serde(default)], so adding them later is not a breaking change).

Fields

status_code: Option<u16>

HTTP status of the response, when it came from one (APICallError.statusCode). Always the observed status: the HTTP layer fills it for every response-derived error; errors built without an HTTP exchange leave it None.

provider_code: Option<String>

Provider’s machine-readable code (OpenAI’s code/type, e.g. "rate_limit_exceeded" vs "insufficient_quota"). Never an HTTP status. Our normalized take on APICallError.data.

message: String

The provider’s message, verbatim. No status prefix.

response_body: Option<String>

The raw response body, verbatim (APICallError.responseBody) — the lossless evidence when message/provider_code are extractions. None when the error did not come from a response body.

request_id: Option<String>

Provider-assigned request id, from the x-request-id / request-id response header when one was sent. Filled by the shared HTTP layer.

retry_after_ms: Option<u64>

Retry hint in milliseconds, distilled from the retry-after-ms / retry-after response headers on a 429. The classification lives in status_code; this is the matching action input.

is_retryable: bool

Whether retrying can help (APICallError.isRetryable) — stored at construction, exactly like the AI SDK: the response path computes it from the status (408/409/429 or 5xx), and the transport path (no response, so no status to compute from) sets it to true explicitly.

Trait Implementations

impl Clone for ApiCallError

fn clone(&self) -> ApiCallError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ApiCallError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ApiCallError

fn default() -> ApiCallError

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ApiCallError

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ApiCallError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

HTTP {status}: {message} when a status is known (just HTTP {status} if the response had no body), else {message}. provider_code and response_body are machine-readable only and stay out of the text.

impl Serialize for ApiCallError

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TS for ApiCallError

type WithoutGenerics = ApiCallError

If this type does not have generic parameters, then WithoutGenerics should just be Self. If the type does have generic parameters, then all generic parameters must be replaced with a dummy type, e.g ts_rs::Dummy or ().
The only requirement for these dummy types is that EXPORT_TO must be None.

type OptionInnerType = ApiCallError

If the implementing type is std::option::Option<T>, then this associated type is set to T. All other implementations of TS should set this type to Self instead.

fn ident(cfg: &Config) -> String

Identifier of this type, excluding generic parameters.

fn docs() -> Option<String>

JSDoc comment to describe this type in TypeScript - when TS is derived, docs are automatically read from your doc comments or #[doc = ".."] attributes

fn name(cfg: &Config) -> String

Name of this type in TypeScript, including generic parameters

fn decl_concrete(cfg: &Config) -> String

Declaration of this type using the supplied generic arguments. The resulting TypeScript definition will not be generic. For that, see TS::decl(). If this type is not generic, then this function is equivalent to TS::decl().

fn decl(cfg: &Config) -> String

Declaration of this type, e.g. type User = { user_id: number, ... }. This function will panic if the type has no declaration.

fn inline(cfg: &Config) -> String

Formats this types definition in TypeScript, e.g { user_id: number }. This function will panic if the type cannot be inlined.

fn inline_flattened(cfg: &Config) -> String

Flatten a type declaration. This function will panic if the type cannot be flattened.

fn visit_generics(v: &mut impl TypeVisitor)

where Self: 'static,

Iterates over all type parameters of this type.

fn output_path() -> Option<PathBuf>

Returns the output path to where T should be exported, relative to the output directory. The returned path does not include any base directory.

fn visit_dependencies(v: &mut impl TypeVisitor)

where Self: 'static,

Iterates over all dependency of this type.

fn dependencies(cfg: &Config) -> Vec<Dependency>

where Self: 'static,

Resolves all dependencies of this type recursively.

fn export(cfg: &Config) -> Result<(), ExportError>

where Self: 'static,

Manually export this type to the filesystem. To export this type together with all of its dependencies, use TS::export_all.

fn export_all(cfg: &Config) -> Result<(), ExportError>

where Self: 'static,

Manually export this type to the filesystem, together with all of its dependencies. To export only this type, without its dependencies, use TS::export.

fn export_to_string(cfg: &Config) -> Result<String, ExportError>

where Self: 'static,

Manually generate bindings for this type, returning a String. This function does not format the output, even if the format feature is enabled.