earendil-works/pi · error

Tool " " requires JSON-schema constrained sampling, but .

Error message

Tool "${tool.name}" requires JSON-schema constrained sampling, but ${error.message}.

What it means

resolveJsonSchemaStrictSampling wraps makeStrictJsonSchema failures: when a tool demands strict sampling (config.strict === 'require') and the schema cannot be strictened for a reason the provider cannot support, the underlying UnsupportedStrictJsonSchemaError message is embedded in this error. Soft-requirement tools instead just fall back to non-strict.

Solutions

1. Fix the tool parameter schema per the embedded error, or disable JSON-schema constrained sampling for this tool.

When it happens

Trigger: Thrown at packages/ai/src/api/constrained-sampling.ts:219 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/ba278472807acfc0. Report an issue: GitHub.

Appendix: source

Thrown at packages/ai/src/api/constrained-sampling.ts:219

	}
	if (schema.properties[inputProperty]?.type !== "string") {
		throw new Error(`grammar constrained sampling property ${inputProperty} must have type string`);
	}
	return inputProperty;
}

export function resolveJsonSchemaStrictSampling(tool: Tool, supportsStrictMode: boolean): boolean | undefined {
	const config = tool.constrainedSampling;
	if (!config || config.type !== "json_schema") return undefined;

	if (supportsStrictMode) {
		try {
			makeStrictJsonSchema(tool.parameters);
			return true;
		} catch (error) {
			if (!(error instanceof UnsupportedStrictJsonSchemaError)) throw error;
			if (config.strict !== "require") return undefined;
			throw new Error(`Tool "${tool.name}" requires JSON-schema constrained sampling, but ${error.message}.`);
		}
	}
	if (config.strict === "require") {
		throw new Error(
			`Tool "${tool.name}" requires JSON-schema constrained sampling, but strict tools are unsupported.`,
		);
	}
	return undefined;
}

export function resolveGrammarConstrainedSampling(
	tool: Tool,
	supportsOpenAIGrammarTools: boolean,
): GrammarConstrainedSampling | undefined {
	const config = tool.constrainedSampling;
	if (!config || config.type !== "grammar") {
		return undefined;
	}

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