diff --git a/src/ai/tools/tool-logger.ts b/src/ai/tools/tool-logger.ts
new file mode 100644
index 0000000..a056778
--- /dev/null
+++ b/src/ai/tools/tool-logger.ts
@@ -0,0 +1,3 @@
+import {appLogger} from "../../logging/logger";
+
+export const toolsLogger = appLogger.child("ai-tools");
diff --git a/src/commands/provider-model-command.ts b/src/commands/provider-model-command.ts
new file mode 100644
index 0000000..f7d1fc0
--- /dev/null
+++ b/src/commands/provider-model-command.ts
@@ -0,0 +1,98 @@
+import {Message} from "typescript-telegram-bot-api";
+import {Command} from "../base/command";
+import {Requirement} from "../base/requirement";
+import {Requirements} from "../base/requirements";
+import {createOllamaClient, resolveAiRuntimeTarget} from "../ai/ai-runtime-target";
+import {formatRuntimeModelInfo, getRuntimeModel, listProviderModels, setRuntimeModel} from "../ai/provider-model-runtime";
+import {Environment} from "../common/environment";
+import {AiProvider} from "../model/ai-provider";
+import {appLogger} from "../logging/logger";
+import {escapeHtml, logError, replyToMessage} from "../util/utils";
+
+const logger = appLogger.child("commands:models");
+
+type ProviderModelCommandOptions = {
+    provider: AiProvider;
+    title: string;
+    description: string;
+};
+
+export abstract class ProviderModelCommand extends Command {
+    protected readonly provider: AiProvider;
+
+    title: string;
+    description: string;
+
+    protected constructor(options: ProviderModelCommandOptions) {
+        super();
+        this.provider = options.provider;
+        this.title = options.title;
+        this.description = options.description;
+    }
+}
+
+export class ProviderGetModelCommand extends ProviderModelCommand {
+    async execute(msg: Message): Promise<void> {
+        logger.debug("get_model", {provider: this.provider, chatId: msg.chat?.id, messageId: msg.message_id});
+        await replyToMessage({message: msg, text: await formatRuntimeModelInfo(this.provider)}).catch(logError);
+    }
+}
+
+export class ProviderSetModelCommand extends ProviderModelCommand {
+    argsMode = "required" as const;
+    requirements = Requirements.Build(Requirement.BOT_CREATOR);
+
+    async execute(msg: Message, match?: RegExpExecArray | null): Promise<void> {
+        const newModel = match?.[3]?.trim();
+        logger.info("set_model.request", {provider: this.provider, hasModel: !!newModel, chatId: msg.chat?.id, messageId: msg.message_id});
+
+        if (newModel) setRuntimeModel(this.provider, newModel);
+
+        const model = getRuntimeModel(this.provider);
+        const text = newModel
+            ? Environment.getSelectedModelWithInfoText(model, await formatRuntimeModelInfo(this.provider))
+            : Environment.getModelIsNotSetCurrentText(model);
+
+        logger.debug("set_model.reply", {provider: this.provider, model});
+        await replyToMessage({message: msg, text}).catch(logError);
+    }
+}
+
+export class ProviderListModelsCommand extends ProviderModelCommand {
+    requirements = Requirements.Build(Requirement.BOT_CREATOR);
+
+    async execute(msg: Message): Promise<void> {
+        try {
+            logger.info("list_models.request", {provider: this.provider, chatId: msg.chat?.id, messageId: msg.message_id});
+            const models = (await listProviderModels(this.provider)).sort((a, b) => a.localeCompare(b));
+            const modelsString = escapeHtml(models.join("\n").substring(0, 4000));
+            const text = await this.buildListText(modelsString);
+
+            logger.debug("list_models.reply", {provider: this.provider, count: models.length, textChars: text.length});
+            await replyToMessage({message: msg, text, parse_mode: "HTML"});
+        } catch (e) {
+            logger.error("list_models.failed", {provider: this.provider, error: e});
+            logError(e);
+            await replyToMessage({message: msg, text: Environment.modelListLoadFailedText}).catch(logError);
+        }
+    }
+
+    private async buildListText(modelsString: string): Promise<string> {
+        if (this.provider !== AiProvider.OLLAMA) {
+            return Environment.modelListHeaderText + "<blockquote expandable>" + modelsString + "</blockquote>";
+        }
+
+        const target = resolveAiRuntimeTarget(AiProvider.OLLAMA, "chat");
+        const loadedModels = ((await createOllamaClient(target).ps())?.models ?? [])
+            .map(model => model.model || model.name)
+            .filter((model): model is string => !!model);
+
+        logger.debug("list_models.loaded", {provider: this.provider, loaded: loadedModels.length});
+        return Environment.getLoadedModelsText(loadedModels)
+            + "\n\n"
+            + Environment.modelListHeaderText
+            + "<blockquote expandable>"
+            + modelsString
+            + "</blockquote>";
+    }
+}
diff --git a/src/logging/ai-logger.ts b/src/logging/ai-logger.ts
new file mode 100644
index 0000000..8fc4811
--- /dev/null
+++ b/src/logging/ai-logger.ts
@@ -0,0 +1,69 @@
+import {Message} from "typescript-telegram-bot-api";
+import {createLogger, formatDuration, LogDetails, LogLevel} from "./logger";
+
+export type AiRunnerLogLevel = LogLevel;
+export type AiRunnerLogDetails = LogDetails;
+
+export type AiLogToolCallLike = {
+    id: string;
+    name: string;
+    argumentsText: string;
+};
+
+const aiRunnerLogger = createLogger("unified-ai-runner", {
+    envPrefix: "AI",
+    defaultLevel: "debug",
+    enabledEnvNames: ["AI_RUNNER_LOGS", "AI_LOG_ENABLED"],
+    colorsEnvNames: ["AI_RUNNER_LOG_COLORS", "AI_LOG_COLORS"],
+});
+
+function safeJsonParseObject(value?: string): Record<string, unknown> {
+    if (!value?.trim()) return {};
+
+    try {
+        const parsed: unknown = JSON.parse(value);
+        return parsed && typeof parsed === "object" && !Array.isArray(parsed)
+            ? parsed as Record<string, unknown>
+            : {};
+    } catch {
+        return {};
+    }
+}
+
+export function aiLog(level: AiRunnerLogLevel, event: string, details?: AiRunnerLogDetails): void {
+    aiRunnerLogger[level](event, details);
+}
+
+export function aiLogDuration(startedAt: number): string {
+    return formatDuration(startedAt);
+}
+
+export function aiLogToolCall(toolCall: AiLogToolCallLike): Record<string, unknown> {
+    return {
+        id: toolCall.id,
+        name: toolCall.name,
+        arguments: safeJsonParseObject(toolCall.argumentsText),
+    };
+}
+
+export function aiLogMessageIdentity(msg: Message | undefined): Record<string, unknown> | undefined {
+    if (!msg) return undefined;
+    return {
+        chatId: msg.chat?.id,
+        chatType: msg.chat?.type,
+        messageId: msg.message_id,
+        fromId: msg.from?.id,
+        username: msg.from?.username,
+    };
+}
+
+export function aiLogProviderTarget(target: {provider: string; purpose?: string; model?: string; baseUrl?: string; apiKey?: string} | undefined): Record<string, unknown> | undefined {
+    if (!target) return undefined;
+    return {
+        provider: target.provider,
+        purpose: target.purpose,
+        model: target.model,
+        baseUrl: target.baseUrl,
+        apiKey: target.apiKey,
+    };
+}
diff --git a/src/logging/logger.ts b/src/logging/logger.ts
new file mode 100644
index 0000000..b19529b
--- /dev/null
+++ b/src/logging/logger.ts
@@ -0,0 +1,352 @@
+export type LogLevel = "trace" | "debug" | "info" | "success" | "warn" | "error";
+
+export type LogDetails = Record<string, unknown>;
+
+export type LoggerOptions = {
+    envPrefix?: string;
+    defaultLevel?: LogLevel;
+    enabledEnvNames?: readonly string[];
+    colorsEnvNames?: readonly string[];
+};
+
+export type Logger = {
+    scope: string;
+    trace(event: string, details?: LogDetails): void;
+    debug(event: string, details?: LogDetails): void;
+    info(event: string, details?: LogDetails): void;
+    success(event: string, details?: LogDetails): void;
+    warn(event: string, details?: LogDetails): void;
+    error(event: string, details?: LogDetails): void;
+    child(scope: string, options?: LoggerOptions): Logger;
+    duration(startedAt: number): string;
+    enabled(level?: LogLevel): boolean;
+};
+
+const DEFAULT_MAX_STRING = 600;
+const DEFAULT_MAX_ARRAY = 8;
+const DEFAULT_MAX_DEPTH = 3;
+
+const LOG_LEVEL_WEIGHT: Record<LogLevel, number> = {
+    trace: 10,
+    debug: 20,
+    info: 30,
+    success: 30,
+    warn: 40,
+    error: 50,
+};
+
+const LOG_COLORS: Record<LogLevel | "reset" | "bold" | "dim" | "label" | "key" | "value", string> = {
+    reset: "\x1b[0m",
+    bold: "\x1b[1m",
+    dim: "\x1b[2m",
+    trace: "\x1b[90m",
+    debug: "\x1b[90m",
+    info: "\x1b[36m",
+    success: "\x1b[32m",
+    warn: "\x1b[33m",
+    error: "\x1b[31m",
+    label: "\x1b[35m",
+    key: "\x1b[94m",
+    value: "\x1b[97m",
+};
+
+const FALSE_VALUES = new Set(["0", "false", "no", "off", "disable", "disabled"]);
+const TRUE_VALUES = new Set(["1", "true", "yes", "on", "enable", "enabled"]);
+
+export function envBool(name: string, defaultValue: boolean): boolean {
+    const value = process.env[name];
+    if (value === undefined) return defaultValue;
+
+    const normalized = value.trim().toLowerCase();
+    if (FALSE_VALUES.has(normalized)) return false;
+    if (TRUE_VALUES.has(normalized)) return true;
+    return defaultValue;
+}
+
+function envNumber(name: string, defaultValue: number): number {
+    const raw = process.env[name];
+    if (!raw?.trim()) return defaultValue;
+
+    const parsed = Number(raw);
+    return Number.isFinite(parsed) && parsed >= 0 ? parsed : defaultValue;
+}
+
+function configuredMaxString(): number {
+    return envNumber("LOG_MAX_STRING", DEFAULT_MAX_STRING);
+}
+
+function configuredMaxArray(): number {
+    return envNumber("LOG_MAX_ARRAY", DEFAULT_MAX_ARRAY);
+}
+
+function configuredMaxDepth(): number {
+    return envNumber("LOG_MAX_DEPTH", DEFAULT_MAX_DEPTH);
+}
+
+function isValidLogLevel(level: string): level is LogLevel {
+    return level in LOG_LEVEL_WEIGHT;
+}
+
+function scopedEnvName(prefix: string | undefined, suffix: string): string | undefined {
+    if (!prefix?.trim()) return undefined;
+    return `${prefix.trim().toUpperCase()}_${suffix}`;
+}
+
+function configuredMinLevel(options: LoggerOptions): LogLevel {
+    const scoped = scopedEnvName(options.envPrefix, "LOG_LEVEL");
+    const raw = (scoped ? process.env[scoped] : undefined) ?? process.env.LOG_LEVEL;
+    const normalized = raw?.trim().toLowerCase();
+
+    if (normalized && isValidLogLevel(normalized)) return normalized;
+    return options.defaultLevel ?? "debug";
+}
+
+function envChainEnabled(names: readonly string[], defaultValue: boolean): boolean {
+    return names.every(name => envBool(name, defaultValue));
+}
+
+function logsEnabled(options: LoggerOptions): boolean {
+    const scoped = scopedEnvName(options.envPrefix, "LOG_ENABLED");
+    const names = [
+        "LOG_ENABLED",
+        "APP_LOG_ENABLED",
+        ...(scoped ? [scoped] : []),
+        ...(options.enabledEnvNames ?? []),
+    ];
+
+    return envChainEnabled(names, true);
+}
+
+function colorsEnabled(options: LoggerOptions): boolean {
+    if (process.env.NO_COLOR) return false;
+
+    const scoped = scopedEnvName(options.envPrefix, "LOG_COLORS");
+    const names = [
+        "LOG_COLORS",
+        ...(scoped ? [scoped] : []),
+        ...(options.colorsEnvNames ?? []),
+    ];
+
+    return envChainEnabled(names, true);
+}
+
+function shouldWriteLevel(level: LogLevel, options: LoggerOptions): boolean {
+    return LOG_LEVEL_WEIGHT[level] >= LOG_LEVEL_WEIGHT[configuredMinLevel(options)];
+}
+
+function paint(value: string, color: keyof typeof LOG_COLORS, options: LoggerOptions): string {
+    if (!colorsEnabled(options)) return value;
+    return `${LOG_COLORS[color]}${value}${LOG_COLORS.reset}`;
+}
+
+export function truncateLogString(value: string, max = configuredMaxString()): string {
+    if (value.length <= max) return value;
+    return `${value.slice(0, max)}… (+${value.length - max} chars)`;
+}
+
+function isSecretKey(keyPath: string): boolean {
+    const normalized = keyPath.toLowerCase();
+    return normalized.includes("token")
+        || normalized.includes("secret")
+        || normalized.includes("password")
+        || normalized.includes("passwd")
+        || normalized.includes("apikey")
+        || normalized.includes("api_key")
+        || normalized.includes("authorization")
+        || normalized.includes("cookie")
+        || normalized.includes("session")
+        || normalized.endsWith(".key")
+        || normalized === "key";
+}
+
+function isPromptKey(keyPath: string): boolean {
+    const normalized = keyPath.toLowerCase();
+    return normalized.includes("prompt") || normalized.includes("systemprompt");
+}
+
+function isTextPreviewKey(keyPath: string): boolean {
+    const normalized = keyPath.toLowerCase();
+    return normalized.includes("content")
+        || normalized.includes("message")
+        || normalized.includes("text")
+        || normalized.includes("preview")
+        || normalized.includes("input")
+        || normalized.includes("output")
+        || normalized.includes("transcript");
+}
+
+function isToolArgsKey(keyPath: string): boolean {
+    const normalized = keyPath.toLowerCase();
+    return normalized.endsWith("args")
+        || normalized.endsWith("arguments")
+        || normalized.includes("toolargs")
+        || normalized.includes("tool_args");
+}
+
+function isDaoKey(keyPath: string): boolean {
+    const normalized = keyPath.toLowerCase();
+    return normalized.includes("dao")
+        || normalized.includes("database")
+        || normalized.includes("db.")
+        || normalized.includes("sql")
+        || normalized.includes("chunk");
+}
+
+function shouldRedactKey(keyPath: string): boolean {
+    if (isSecretKey(keyPath)) return true;
+    if (isPromptKey(keyPath) && !envBool("AI_LOG_PROMPTS", false)) return true;
+    if (isToolArgsKey(keyPath) && !envBool("AI_LOG_TOOL_ARGS", false)) return true;
+    if (isDaoKey(keyPath) && !envBool("AI_LOG_DAO", false)) return true;
+    if (isTextPreviewKey(keyPath) && !envBool("AI_LOG_TEXT_PREVIEW", false)) return true;
+    return false;
+}
+
+function primitiveToLogValue(value: unknown): unknown {
+    if (value instanceof Error) {
+        return {
+            name: value.name,
+            message: value.message,
+            stack: value.stack?.split("\n").slice(0, 8).join("\n"),
+        };
+    }
+
+    if (value instanceof Date) return value.toISOString();
+    if (typeof value === "string") return truncateLogString(value);
+    if (typeof value === "number" || typeof value === "boolean" || value === null || value === undefined) return value;
+    if (typeof value === "bigint") return value.toString();
+    if (typeof value === "function") return `[Function ${value.name || "anonymous"}]`;
+    if (Buffer.isBuffer(value)) return `<Buffer ${value.length} bytes>`;
+    return undefined;
+}
+
+function looksLikeLargeBinaryKey(key: string): boolean {
+    const normalized = key.toLowerCase();
+    return normalized === "data"
+        || normalized === "image_url"
+        || normalized.endsWith("b64")
+        || normalized.endsWith("base64")
+        || normalized.includes("binary");
+}
+
+export function flattenLogDetails(
+    value: unknown,
+    keyPath = "",
+    depth = 0,
+    seen = new WeakSet<object>(),
+): Record<string, unknown> {
+    if (keyPath && shouldRedactKey(keyPath)) {
+        return {[keyPath]: "<redacted>"};
+    }
+
+    const primitive = primitiveToLogValue(value);
+    if (primitive !== undefined || value === undefined) {
+        return keyPath ? {[keyPath]: primitive} : {value: primitive};
+    }
+
+    if (typeof value !== "object" || value === null) {
+        return keyPath ? {[keyPath]: String(value)} : {value: String(value)};
+    }
+
+    if (seen.has(value)) {
+        return keyPath ? {[keyPath]: "[Circular]"} : {value: "[Circular]"};
+    }
+    seen.add(value);
+
+    if (Array.isArray(value)) {
+        if (depth >= configuredMaxDepth()) {
+            return keyPath ? {[keyPath]: `[Array ${value.length}]`} : {value: `[Array ${value.length}]`};
+        }
+
+        const entries: Record<string, unknown> = {};
+        value.slice(0, configuredMaxArray()).forEach((item, index) => {
+            Object.assign(entries, flattenLogDetails(item, keyPath ? `${keyPath}.${index}` : String(index), depth + 1, seen));
+        });
+        if (value.length > configuredMaxArray()) {
+            entries[keyPath ? `${keyPath}.__more` : "__more"] = value.length - configuredMaxArray();
+        }
+        return entries;
+    }
+
+    if (depth >= configuredMaxDepth()) {
+        return keyPath ? {[keyPath]: "[Object]"} : {value: "[Object]"};
+    }
+
+    const entries: Record<string, unknown> = {};
+    for (const [key, raw] of Object.entries(value)) {
+        const childPath = keyPath ? `${keyPath}.${key}` : key;
+        if (looksLikeLargeBinaryKey(key) && typeof raw === "string") {
+            entries[childPath] = `<${raw.length} chars>`;
+            continue;
+        }
+
+        Object.assign(entries, flattenLogDetails(raw, childPath, depth + 1, seen));
+    }
+
+    return entries;
+}
+
+export function redactLogValue(value: unknown): Record<string, unknown> {
+    return flattenLogDetails(value);
+}
+
+function formatDetails(details: LogDetails | undefined, options: LoggerOptions): string {
+    if (!details || !Object.keys(details).length) return "";
+
+    const flattened = flattenLogDetails(details);
+    const chunks = Object.entries(flattened).map(([key, value]) => {
+        const safeValue = typeof value === "string" ? value : JSON.stringify(value);
+        return `${paint(key, "key", options)}=${paint(safeValue ?? "undefined", "value", options)}`;
+    });
+
+    return ` ${chunks.join(" ")}`;
+}
+
+function writeLine(level: LogLevel, line: string): void {
+    if (level === "error") {
+        console.error(line);
+        return;
+    }
+
+    if (level === "warn") {
+        console.warn(line);
+        return;
+    }
+
+    console.log(line);
+}
+
+export function formatDuration(startedAt: number): string {
+    const ms = Date.now() - startedAt;
+    if (ms < 1000) return `${ms}ms`;
+    return `${(ms / 1000).toFixed(2)}s`;
+}
+
+export function createLogger(scope: string, options: LoggerOptions = {}): Logger {
+    const normalizedScope = scope.trim() || "app";
+    const resolvedOptions = {...options};
+
+    const log = (level: LogLevel, event: string, details?: LogDetails): void => {
+        if (!logsEnabled(resolvedOptions) || !shouldWriteLevel(level, resolvedOptions)) return;
+
+        const timestamp = paint(new Date().toISOString(), "dim", resolvedOptions);
+        const prefix = paint(normalizedScope, "bold", resolvedOptions);
+        const levelText = paint(level.toUpperCase().padEnd(7), level, resolvedOptions);
+        const eventText = paint(event, "label", resolvedOptions);
+        writeLine(level, `${timestamp} ${prefix} ${levelText} ${eventText}${formatDetails(details, resolvedOptions)}`);
+    };
+
+    return {
+        scope: normalizedScope,
+        trace: (event, details) => log("trace", event, details),
+        debug: (event, details) => log("debug", event, details),
+        info: (event, details) => log("info", event, details),
+        success: (event, details) => log("success", event, details),
+        warn: (event, details) => log("warn", event, details),
+        error: (event, details) => log("error", event, details),
+        child: (childScope, childOptions) => createLogger(`${normalizedScope}:${childScope}`, {...resolvedOptions, ...childOptions}),
+        duration: formatDuration,
+        enabled: (level = "debug") => logsEnabled(resolvedOptions) && shouldWriteLevel(level, resolvedOptions),
+    };
+}
+
+export const appLogger = createLogger("app", {envPrefix: "APP", defaultLevel: "debug"});