Crate agentcast 

Structured-output enforcer for LLM responses.

Three-pass pipeline: repair → validate → optional retry with LLM. Repair handles the common cases (markdown fences, trailing commas, surrounding prose) locally; validation uses a JSON Schema you supply. If validation fails and you provide a retry function, the pipeline rerolls with an LLM-friendly hint until success or max_retries is exhausted.

Quick start

use agentcast::Caster;
use serde_json::json;

let schema = json!({
    "type": "object",
    "properties": {
        "label": {"type": "string"},
        "confidence": {"type": "number"}
    },
    "required": ["label", "confidence"]
});
let caster = Caster::new(&schema).unwrap();

// The LLM wrapped its JSON in markdown — repair handles that:
let raw = "```json\n{\"label\": \"positive\", \"confidence\": 0.92,}\n```";
let value = caster.parse(raw).unwrap();
assert_eq!(value["label"], "positive");

Structs

CastIssue

One concrete validation issue.

Caster

Three-pass caster: repair → validate → optional LLM retry.

Enums

CastError

Error returned by Caster::parse and friends.

Traits

RetryFn

User-supplied retry function: takes the LLM-friendly hint, returns the model’s next attempt as raw text.

Functions

repair

Apply all three repair passes in order.