earendil-works/pi · error · UnsupportedStrictJsonSchemaError

object properties must be a schema map

Error message

object properties must be a schema map

What it means

Error "object properties must be a schema map" thrown in earendil-works/pi.

Source

Thrown at packages/ai/src/api/constrained-sampling.ts:91

	}

	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 : []);
	if ([...required].some((key) => !propertyNames.includes(key))) {
		throw new UnsupportedStrictJsonSchemaError("required contains an unknown property");
	}
	for (const [key, property] of Object.entries(properties)) {
		makeJsonSchemaNodeStrict(property);
		if (!required.has(key) && !schemaAllowsNull(property)) {
			properties[key] = { anyOf: [property, { type: "null" }] };

View on GitHub (pinned to 4af9d21d3b)

Solutions

1. Make properties an object that maps property names to schemas.

When it happens

Trigger: Thrown at packages/ai/src/api/constrained-sampling.ts:91 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/d31a7ce1db898df5. Report an issue: GitHub.