1/**
  2 * Agent discovery and configuration
  3 */
  4
  5import * as fs from "node:fs";
  6import * as os from "node:os";
  7import * as path from "node:path";
  8import { parseFrontmatter } from "@mariozechner/pi-coding-agent";
  9
 10export type AgentScope = "user" | "project" | "both";
 11
 12export interface AgentConfig {
 13	name: string;
 14	description: string;
 15	tools?: string[];
 16	model?: string;
 17	systemPrompt: string;
 18	source: "user" | "project";
 19	filePath: string;
 20}
 21
 22export interface AgentDiscoveryResult {
 23	agents: AgentConfig[];
 24	projectAgentsDir: string | null;
 25}
 26
 27function loadAgentsFromDir(dir: string, source: "user" | "project"): AgentConfig[] {
 28	const agents: AgentConfig[] = [];
 29
 30	if (!fs.existsSync(dir)) {
 31		return agents;
 32	}
 33
 34	let entries: fs.Dirent[];
 35	try {
 36		entries = fs.readdirSync(dir, { withFileTypes: true });
 37	} catch {
 38		return agents;
 39	}
 40
 41	for (const entry of entries) {
 42		if (!entry.name.endsWith(".md")) continue;
 43		if (!entry.isFile() && !entry.isSymbolicLink()) continue;
 44
 45		const filePath = path.join(dir, entry.name);
 46		let content: string;
 47		try {
 48			content = fs.readFileSync(filePath, "utf-8");
 49		} catch {
 50			continue;
 51		}
 52
 53		const { frontmatter, body } = parseFrontmatter<Record<string, string>>(content);
 54
 55		if (!frontmatter.name || !frontmatter.description) {
 56			continue;
 57		}
 58
 59		const tools = frontmatter.tools
 60			?.split(",")
 61			.map((t: string) => t.trim())
 62			.filter(Boolean);
 63
 64		agents.push({
 65			name: frontmatter.name,
 66			description: frontmatter.description,
 67			tools: tools && tools.length > 0 ? tools : undefined,
 68			model: frontmatter.model,
 69			systemPrompt: body,
 70			source,
 71			filePath,
 72		});
 73	}
 74
 75	return agents;
 76}
 77
 78function isDirectory(p: string): boolean {
 79	try {
 80		return fs.statSync(p).isDirectory();
 81	} catch {
 82		return false;
 83	}
 84}
 85
 86function findNearestProjectAgentsDir(cwd: string): string | null {
 87	let currentDir = cwd;
 88	while (true) {
 89		const candidate = path.join(currentDir, ".pi", "agents");
 90		if (isDirectory(candidate)) return candidate;
 91
 92		const parentDir = path.dirname(currentDir);
 93		if (parentDir === currentDir) return null;
 94		currentDir = parentDir;
 95	}
 96}
 97
 98export function discoverAgents(cwd: string, scope: AgentScope): AgentDiscoveryResult {
 99	const userDir = path.join(os.homedir(), ".pi", "agent", "agents");
100	const projectAgentsDir = findNearestProjectAgentsDir(cwd);
101
102	const userAgents = scope === "project" ? [] : loadAgentsFromDir(userDir, "user");
103	const projectAgents = scope === "user" || !projectAgentsDir ? [] : loadAgentsFromDir(projectAgentsDir, "project");
104
105	const agentMap = new Map<string, AgentConfig>();
106
107	if (scope === "both") {
108		for (const agent of userAgents) agentMap.set(agent.name, agent);
109		for (const agent of projectAgents) agentMap.set(agent.name, agent);
110	} else if (scope === "user") {
111		for (const agent of userAgents) agentMap.set(agent.name, agent);
112	} else {
113		for (const agent of projectAgents) agentMap.set(agent.name, agent);
114	}
115
116	return { agents: Array.from(agentMap.values()), projectAgentsDir };
117}
118
119export function formatAgentList(agents: AgentConfig[], maxItems: number): { text: string; remaining: number } {
120	if (agents.length === 0) return { text: "none", remaining: 0 };
121	const listed = agents.slice(0, maxItems);
122	const remaining = agents.length - listed.length;
123	return {
124		text: listed.map((a) => `${a.name} (${a.source}): ${a.description}`).join("; "),
125		remaining,
126	};
127}