Struct CountInputTokensRequest 

pub struct CountInputTokensRequest {
    pub model: Option<String>,
    pub input: InputParam,
    pub instructions: Option<String>,
    pub tools: Option<Vec<Tool>>,
}

Request body for POST /v1/responses/input_tokens.

A subset of CreateResponse — only the fields that reach the rendered prompt. This mirrors AnthropicCountTokensRequest, which is the same subset-of-the-create-request shape for POST /v1/messages/count_tokens.

Two deliberate differences from CreateResponse: input defaults (the count endpoint accepts a body without one, whereas creating a response requires it), and unknown fields are ignored, so stateful parameters Dynamo does not serve (conversation, previous_response_id) are accepted and disregarded rather than rejected. This endpoint reports a pre-flight estimate; it never generates, so there is nothing for them to affect.

Deserialization is forgiving in two further places — an explicit "input": null and unrecognized tool shapes — for the same reason AnthropicTool keeps every field but name optional: a pre-flight estimate that rejects a body it could have scored is strictly worse than one that scores it approximately. See [deserialize_lenient_tools].

Fields

model: Option<String>

input: InputParam

#[serde(default)] alone covers an absent input, but not an explicit "input": null — serde still hands that null to InputParam, whose deserializer rejects it. Here both mean “nothing to count”.

instructions: Option<String>

tools: Option<Vec<Tool>>

Implementations

impl CountInputTokensRequest

pub fn estimate_tokens(&self) -> u32

Estimate input token count using a len/3 heuristic.

Same contract as AnthropicCountTokensRequest::estimate_tokens: sum the character lengths of everything that reaches the prompt, divide by three, and never report zero for input that carried content.

This is an estimate, not a tokenization. A frontend serving a backend that tokenizes for itself has no tokenizer loaded, so this endpoint has to be able to answer without one.

Trait Implementations

impl Clone for CountInputTokensRequest

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CountInputTokensRequest

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

Formats the value using the given formatter.

impl Default for CountInputTokensRequest

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for CountInputTokensRequest

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for CountInputTokensRequest

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for CountInputTokensRequest

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for CountInputTokensRequest