Struct ModelCallFailureData 

pub struct ModelCallFailureData {

    pub api_call_id: Option<String>,
    pub api_endpoint: Option<AssistantUsageApiEndpoint>,
    pub bad_request_kind: Option<ModelCallFailureBadRequestKind>,
    pub duration_ms: Option<i64>,
    pub error_code: Option<String>,
    pub error_message: Option<String>,
    pub error_type: Option<String>,
    pub failure_kind: Option<ModelCallFailureKind>,
    pub initiator: Option<String>,
    pub is_auto: Option<bool>,
    pub is_byok: Option<bool>,
    pub max_output_tokens: Option<i64>,
    pub max_prompt_tokens: Option<i64>,
    pub model: Option<String>,
    pub provider_call_id: Option<String>,
    pub reasoning_effort: Option<String>,
    pub request_fingerprint: Option<ModelCallFailureRequestFingerprint>,
    pub service_request_id: Option<String>,
    pub source: ModelCallFailureSource,
    pub status_code: Option<i32>,
    pub transport: Option<ModelCallFailureTransport>,
    /* private fields */
}

Session event “model.call_failure”. Failed LLM API call metadata for telemetry

Fields

api_call_id: Option<String>

Completion ID from the model provider (e.g., chatcmpl-abc123)

api_endpoint: Option<AssistantUsageApiEndpoint>

API endpoint used for this model call, matching CAPI supported_endpoints vocabulary

bad_request_kind: Option<ModelCallFailureBadRequestKind>

For HTTP 400 failures only: whether the response carried a structured CAPI error envelope (structured_error, a deterministic validation failure) or no error body (bodyless, the transient gateway/proxy signature). Absent for non-400 failures.

duration_ms: Option<i64>

Duration of the failed API call in milliseconds

error_code: Option<String>

For HTTP 400 failures only: the code from the CAPI error envelope (e.g. ‘model_max_prompt_tokens_exceeded’) identifying which deterministic validation failure occurred. Raw server-controlled string, emitted only through restricted telemetry. Absent for bodyless or non-400 failures.

error_message: Option<String>

Raw provider/runtime error message for restricted telemetry

error_type: Option<String>

For HTTP 400 failures only: the type from the CAPI error envelope (e.g. ‘websocket_error’), a coarser companion to errorCode for envelopes that carry no code. Raw server-controlled string, emitted only through restricted telemetry. Absent for bodyless or non-400 failures.

failure_kind: Option<ModelCallFailureKind>

Whether the failure originated from an API response or the request transport

initiator: Option<String>

What initiated this API call (e.g., “sub-agent”, “mcp-sampling”); absent for user-initiated calls

is_auto: Option<bool>

Whether the session selected Auto mode for the failed call

is_byok: Option<bool>

Whether the failed call used a bring-your-own-key provider

max_output_tokens: Option<i64>

Effective maximum output-token limit for the failed call

max_prompt_tokens: Option<i64>

Effective maximum prompt-token limit for the failed call

model: Option<String>

Model identifier used for the failed API call

provider_call_id: Option<String>

GitHub request tracing ID (x-github-request-id header) for server-side log correlation

reasoning_effort: Option<String>

Reasoning effort level used for the failed model call, if applicable

request_fingerprint: Option<ModelCallFailureRequestFingerprint>

Content-free structural summary of the failing request. Contains only counts and shape flags (no prompt content), so it is safe for unrestricted telemetry. Populated only for client-error (4xx) failures.

service_request_id: Option<String>

Copilot service request ID (x-copilot-service-request-id header) for CAPI log correlation

source: ModelCallFailureSource

Where the failed model call originated

status_code: Option<i32>

HTTP status code from the failed request

transport: Option<ModelCallFailureTransport>

Transport used for the failed model call (http or websocket)

Trait Implementations

impl Clone for ModelCallFailureData

fn clone(&self) -> ModelCallFailureData

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ModelCallFailureData

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

Formats the value using the given formatter.

impl Default for ModelCallFailureData

fn default() -> ModelCallFailureData

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ModelCallFailureData

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ModelCallFailureData

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

where __S: Serializer,

Serialize this value into the given Serde serializer.