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Agentium 4.0.0 · Upgrade from 3.x.
Public logging signatures and configuration in @agentium/core 4.0.0.
@agentium/core. Read the logging guide for setup and behavior, or return to the package reference.
A ? marks an optional field. These are declarations for lookup; run the examples in the linked guide. Follow related-type links for Agentium types and source links for imported dependency types.
export declare class Logger {
constructor(config?: LoggerConfig);
/** Compact JSON when it fits one line; otherwise pretty-print. Never slice mid-token. */
formatPayload(value: unknown, maxChars?: number): string;
debug(msg: string, data?: Record<string, unknown>): void;
info(msg: string, data?: Record<string, unknown>): void;
warn(msg: string, data?: Record<string, unknown>): void;
error(msg: string, data?: Record<string, unknown>): void;
agentStart(agentName: string, input: string): void;
toolCall(toolName: string, args?: Record<string, unknown>): void;
toolResult(toolName: string, result: string): void;
thinking(content: string): void;
agentEnd(_agentName: string, output: string, usage: {
promptTokens: number;
completionTokens: number;
totalTokens: number;
reasoningTokens?: number;
}, durationMs: number): void;
separator(): void;
}
LoggerConfig.
export interface LoggerConfig {
level?: LogLevel;
color?: boolean;
prefix?: string;
/**
* Max characters of a tool arg/result body printed at debug.
* Default: 100_000 (full JSON in practice). Set lower if a toolkit dumps megabytes.
*/
maxPayloadChars?: number;
}
LogLevel.
export type LogLevel = "debug" | "info" | "warn" | "error" | "silent";