alibaba/spring-ai-alibaba · error · IllegalArgumentException

No AgentTypeProvider for type: ${type}

Error message

No AgentTypeProvider for type: ${type}

What it means

AgentTypeProviderRegistry.get() throws this IllegalArgumentException when no registered AgentTypeProvider matches the requested agent type string. The registry maps each provider's type() to the provider; unknown types are rejected up-front during generation. It means the DSL declares an agent type this build of the framework does not know.

Source

Thrown at spring-ai-alibaba-admin/spring-ai-alibaba-admin-server-start/src/main/java/com/alibaba/cloud/ai/studio/admin/builder/generator/service/generator/agent/AgentTypeProviderRegistry.java:41

/**
 * @author yHong
 * @version 1.0
 * @since 2025/8/28 17:56
 */
@Component
public class AgentTypeProviderRegistry {

	private final Map<String, AgentTypeProvider> providers;

	public AgentTypeProviderRegistry(List<AgentTypeProvider> providers) {
		this.providers = providers.stream().collect(Collectors.toMap(AgentTypeProvider::type, p -> p));
	}

	public AgentTypeProvider get(String type) {
		AgentTypeProvider p = providers.get(type);
		if (p == null) {
			throw new IllegalArgumentException("No AgentTypeProvider for type: " + type);
		}
		return p;
	}

}

View on GitHub (pinned to f82da0b50f)

Solutions

1. Fix the "type" value to a registered type (e.g. react_agent, sequential_agent, parallel_agent, routing_agent, loop_agent)
2. Upgrade the spring-ai-alibaba-admin dependency to a version supporting the type
3. If it's a custom type, implement AgentTypeProvider and ensure it is registered as a bean so the registry picks it up

Example fix

// before
{"type": "react_agant", "name": "assistant", ...}
// after
{"type": "react_agent", "name": "assistant", ...}

Set<String> known = Set.of("react_agent","sequential_agent","parallel_agent","routing_agent","loop_agent");
if (!known.contains(config.get("type"))) {
    throw new IllegalArgumentException("unknown agent type: " + config.get("type"));
}

try {
    registry.get(type);
} catch (IllegalArgumentException e) {
    if (e.getMessage().startsWith("No AgentTypeProvider")) {
        // suggest known types or check dependency version
    }
}

When it happens

Trigger: Calling registry.get(type) with a type string that no provider registers, e.g. a typo like "react-agant", an unsupported custom type, or a type from a newer framework version than the one on the classpath.

Common situations: Typo in the "type" field of the DSL; using a new agent type with an older spring-ai-alibaba-admin dependency; case mismatch ("ReactAgent" vs "react_agent"); custom provider not registered as a Spring bean so it isn't collected into the registry.

Understand the failure class

Background: Invalid enum value errors: "Unknown type", "Invalid scope", "must be one of" — when a string is not on the library's allowed list — this error's family across 23 libraries.

Related errors

• AppTypeNotSupport
• unsupported format:
• Read dsl file failed, please check if the encoding of file i
• Not support dslValue: [${dslValue}] for type: [${variableTyp
• Unsupported logical operator type: ${value}

AI-assisted analysis of alibaba/spring-ai-alibaba@f82da0b50f (2026-09-09). Data as JSON: /api/errors/d980829e850b513f. Report an issue: GitHub.