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`ai-client.ts`

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3ef4c9dClaude	1	/**
	2	* Shared Anthropic client + helpers for all AI-powered features.
	3	* Centralised here so model choice, caching, and key handling live in one place.
	4	*/
	5
	6	import Anthropic from "@anthropic-ai/sdk";
	7	import { config } from "./config";
	8
	9	let _client: Anthropic \| null = null;
	10
	11	export function getAnthropic(): Anthropic {
	12	if (!_client) {
	13	if (!config.anthropicApiKey) {
	14	throw new Error("ANTHROPIC_API_KEY is not set");
	15	}
	16	_client = new Anthropic({ apiKey: config.anthropicApiKey });
	17	}
	18	return _client;
	19	}
	20
	21	export function isAiAvailable(): boolean {
	22	return !!config.anthropicApiKey;
	23	}
	24
40e7738Claude	25	/**
	26	* Default model for code understanding + review.
	27	* Owner-mandated to `claude-sonnet-4-6` — the most reliable model for the
	28	* gluecron workload as of this build. Override at runtime with MODEL_SONNET
	29	* env if a future model proves better; do not edit the constant.
	30	*/
	31	export const MODEL_SONNET = process.env.MODEL_SONNET \|\| "claude-sonnet-4-6";
	32	/** Fast model for lightweight tasks (commit messages, titles, completions). */
	33	export const MODEL_HAIKU = process.env.MODEL_HAIKU \|\| "claude-haiku-4-5-20251001";
3ef4c9dClaude	34
	35	/**
	36	* Extract text content from an Anthropic message response.
	37	*/
	38	export function extractText(
	39	message: Anthropic.Messages.Message
	40	): string {
	41	for (const block of message.content) {
	42	if (block.type === "text") return block.text;
	43	}
	44	return "";
	45	}
	46
	47	/**
	48	* Safely parse JSON from a Claude response that may include surrounding prose
	49	* or a ```json code block.
	50	*/
	51	export function parseJsonResponse<T = unknown>(text: string): T \| null {
	52	// Prefer ```json blocks
	53	const fenced = text.match(/```(?:json)?\s(\{[\s\S]?\}\|\[[\s\S]?\])\s```/);
	54	const candidate = fenced ? fenced[1] : null;
	55	if (candidate) {
	56	try {
	57	return JSON.parse(candidate) as T;
	58	} catch {
	59	// fall through
	60	}
	61	}
	62	// Fall back to first top-level {...} or [...]
	63	const braceMatch = text.match(/\{[\s\S]*\}/);
	64	if (braceMatch) {
	65	try {
	66	return JSON.parse(braceMatch[0]) as T;
	67	} catch {
	68	// fall through
	69	}
	70	}
	71	const bracketMatch = text.match(/\[[\s\S]*\]/);
	72	if (bracketMatch) {
	73	try {
	74	return JSON.parse(bracketMatch[0]) as T;
	75	} catch {
	76	return null;
	77	}
	78	}
	79	return null;
	80	}