earendil-works/pi · error · UnsupportedStrictJsonSchemaError

properties require type object

Error message

properties require type object

What it means

Error "properties require type object" thrown in earendil-works/pi.

Source

Thrown at packages/ai/src/api/constrained-sampling.ts:84

		}
		for (const variant of schema.anyOf) {
			if (isStructuredSchema(variant)) {
				throw new UnsupportedStrictJsonSchemaError("object and array unions are unsupported");
			}
			makeJsonSchemaNodeStrict(variant);
		}
	}

	if (schema.items !== undefined) {
		if (Array.isArray(schema.items)) {
			throw new UnsupportedStrictJsonSchemaError("tuple schemas are unsupported");
		}
		makeJsonSchemaNodeStrict(schema.items);
	}

	const isObjectSchema = schema.type === "object";
	if (schema.properties !== undefined && !isObjectSchema) {
		throw new UnsupportedStrictJsonSchemaError("properties require type object");
	}
	if (!isObjectSchema) return;
	if (schema.additionalProperties !== undefined && schema.additionalProperties !== false) {
		throw new UnsupportedStrictJsonSchemaError("schema-valued or true additionalProperties is unsupported");
	}
	if (schema.properties !== undefined && !isJsonSchemaObject(schema.properties)) {
		throw new UnsupportedStrictJsonSchemaError("object properties must be a schema map");
	}
	if (
		schema.required !== undefined &&
		(!Array.isArray(schema.required) || schema.required.some((key) => typeof key !== "string"))
	) {
		throw new UnsupportedStrictJsonSchemaError("object required must be a string array");
	}

	const properties = schema.properties ?? {};
	const propertyNames = Object.keys(properties);
	const required = new Set(Array.isArray(schema.required) ? schema.required : []);

View on GitHub (pinned to 4af9d21d3b)

Solutions

1. Set the schema type to object when declaring properties.

When it happens

Trigger: Thrown at packages/ai/src/api/constrained-sampling.ts:84 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of earendil-works/pi@4af9d21d3b (2026-08-24). Data as JSON: /api/errors/3fb6edb673190ac3. Report an issue: GitHub.