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#!/usr/bin/env node

'use strict';

const fs = require('fs');

const path = require('path');

const TOOL_NAME_MAP = new Map([

['Read', 'read_file'],

['Write', 'write_file'],

['Edit', 'replace'],

['Bash', 'run_shell_command'],

['Grep', 'grep_search'],

['Glob', 'glob'],

['WebSearch', 'google_web_search'],

['WebFetch', 'web_fetch'],

]);

function usage() {

return [

'Adapt ECC agent frontmatter for Gemini CLI.',

'',

'Usage:',

' node scripts/gemini-adapt-agents.js [agents-dir]',

'',

'Defaults to .gemini/agents under the current working directory.',

'Rewrites tools: to Gemini-compatible tool names and removes unsupported color: metadata.'

].join('\n');

}

function parseArgs(argv) {

if (argv.includes('--help') || argv.includes('-h')) {

return { help: true };

}

const positional = argv.filter(arg => !arg.startsWith('-'));

if (positional.length > 1) {

throw new Error('Expected at most one agents directory argument');

}

return {

help: false,

agentsDir: path.resolve(positional[0] || path.join(process.cwd(), '.gemini', 'agents')),

};

}

function ensureDirectory(dirPath) {

if (!fs.existsSync(dirPath)) {

throw new Error(`Agents directory not found: ${dirPath}`);

}

if (!fs.statSync(dirPath).isDirectory()) {

throw new Error(`Expected a directory: ${dirPath}`);

}

}

function stripQuotes(value) {

return value.trim().replace(/^['"]|['"]$/g, '');

}

function parseToolList(line) {

const match = line.match(/^(\s*tools\s*:\s*)\[(.*)\]\s*$/);

if (!match) {

return null;

}

const rawItems = match[2].trim();

if (!rawItems) {

return [];

}

return rawItems

.split(',')

.map(part => stripQuotes(part))

.filter(Boolean);

}

function adaptToolName(toolName) {

const mapped = TOOL_NAME_MAP.get(toolName);

if (mapped) {

return mapped;

}

if (toolName.startsWith('mcp__')) {

return toolName

.replace(/^mcp__/, 'mcp_')

.replace(/__/g, '_')

.replace(/[^A-Za-z0-9_]/g, '_')

.toLowerCase();

}

return toolName;

}

function formatToolLine(tools) {

return `tools: [${tools.map(tool => JSON.stringify(tool)).join(', ')}]`;

}

function adaptFrontmatter(text) {

const match = text.match(/^---\n([\s\S]*?)\n---(\n|$)/);

if (!match) {

return { text, changed: false };

}

let changed = false;

const updatedLines = [];

for (const line of match[1].split('\n')) {

if (/^\s*color\s*:/.test(line)) {

changed = true;

continue;

}

const tools = parseToolList(line);

if (tools) {

const adaptedTools = [];

const seen = new Set();

for (const tool of tools.map(adaptToolName)) {

if (seen.has(tool)) {

continue;

}

seen.add(tool);

adaptedTools.push(tool);

}

const updatedLine = formatToolLine(adaptedTools);

if (updatedLine !== line) {

changed = true;

}

updatedLines.push(updatedLine);

continue;

}

updatedLines.push(line);

}

if (!changed) {

return { text, changed: false };

}

return {

text: `---\n${updatedLines.join('\n')}\n---${match[2]}${text.slice(match[0].length)}`,

changed: true,

};

}

function adaptAgents(dirPath) {

ensureDirectory(dirPath);

let updated = 0;

let unchanged = 0;

for (const entry of fs.readdirSync(dirPath, { withFileTypes: true })) {

if (!entry.isFile() || !entry.name.endsWith('.md')) {

continue;

}

const filePath = path.join(dirPath, entry.name);

const original = fs.readFileSync(filePath, 'utf8');

const adapted = adaptFrontmatter(original);

if (adapted.changed) {

fs.writeFileSync(filePath, adapted.text);

updated += 1;

} else {

unchanged += 1;

}

}

return { updated, unchanged };

}

function main() {

const options = parseArgs(process.argv.slice(2));

if (options.help) {

console.log(usage());

return;

}

const result = adaptAgents(options.agentsDir);

console.log(`Updated ${result.updated} agent file(s); ${result.unchanged} already compatible`);

}

try {

main();

} catch (error) {

console.error(error.message);

process.exit(1);

}