Struct StructuredOutputValidator 

pub struct StructuredOutputValidator { /* private fields */ }

Middleware that validates structured output from a tool against a JSON Schema.

When attached to a “result” tool, this validates the model’s JSON input against the expected schema. On validation failure, returns ToolError::ModelRetry with a description of what went wrong so the model can self-correct.

This implements the tool-based structured output pattern used by instructor, Pydantic AI, and Rig: inject a tool with the output schema, force the model to call it, and validate.

Implementations

impl StructuredOutputValidator

pub fn new(schema: Value, max_retries: usize) -> Self

Create a new structured output validator.

The schema should be a JSON Schema object describing the expected output shape. max_retries limits how many times the model can retry on validation failure (0 means fail immediately on first error).

Trait Implementations

impl ToolMiddleware for StructuredOutputValidator

fn process<'a>( &'a self, call: &'a ToolCall, ctx: &'a ToolContext, next: Next<'a>, ) -> WasmBoxedFuture<'a, Result<ToolOutput, ToolError>>

Process a tool call, optionally delegating to the next middleware/tool.