HarnessContext

HarnessContext<TMetadata> = object

Runtime context passed from the eval fixture into a harness run.

Example

const harness: Harness<string> = {
  name: "refund-agent",
  async run(input, context) {
    context.setArtifact("inputLength", input.length);

    return {
      output: undefined,
      session: { messages: [{ role: "user", content: input }] },
      usage: {},
      errors: [],
    };
  },
};

Type Parameters

TMetadata

TMetadata extends HarnessMetadata = HarnessMetadata

Properties

artifacts

artifacts: Record<string, JsonValue>

Mutable JSON-safe artifact bag shared with the harness.

---

metadata

metadata: Readonly<TMetadata>

Per-run metadata passed through run(input, { metadata }).

---

setArtifact

setArtifact: (name, value) => void

Stores one JSON-safe artifact on the current run.

Parameters

name

string

value

JsonValue

Returns

void

---

signal?

optional signal?: AbortSignal

Abort signal from Vitest when available.