MCP Global Configuration Installer for Claude Code

install-mcp-config.ts

#!/usr/bin/env bun
/**
 * MCP Global Configuration Installer
 *
 * Fetches MCP server configuration from 1Password and merges it into ~/.claude.json
 *
 * Prerequisites:
 *   - 1Password CLI (op) installed and signed in
 *   - bun runtime
 *
 * Installation:
 *   1. Save this script to ~/.local/bin/install-mcp-config.ts
 *   2. chmod +x ~/.local/bin/install-mcp-config.ts
 *   3. Run: install-mcp-config.ts
 *
 * Or run directly with:
 *   bun run ~/.local/bin/install-mcp-config.ts
 */

import { $ } from "bun";
import { homedir } from "os";
import { join } from "path";

const CLAUDE_CONFIG_PATH = join(homedir(), ".claude.json");
const OP_REFERENCE = "op://Config/mcp.global-configuration/notesPlain";

async function main() {
  console.log("Fetching MCP configuration from 1Password...");

  // Fetch config from 1Password
  const result = await $`op read ${OP_REFERENCE}`.text();
  const mcpServers = JSON.parse(result.trim());

  console.log(`Found ${Object.keys(mcpServers).length} MCP servers:`, Object.keys(mcpServers).join(", "));

  // Read existing claude.json
  const claudeConfigFile = Bun.file(CLAUDE_CONFIG_PATH);
  if (!(await claudeConfigFile.exists())) {
    console.error(`Error: ${CLAUDE_CONFIG_PATH} not found`);
    process.exit(1);
  }

  const claudeConfig = await claudeConfigFile.json();

  // Merge MCP servers
  const existingServers = claudeConfig.mcpServers || {};
  const mergedServers = { ...existingServers, ...mcpServers };

  const added = Object.keys(mcpServers).filter((k) => !existingServers[k]);
  const updated = Object.keys(mcpServers).filter((k) => existingServers[k]);

  claudeConfig.mcpServers = mergedServers;

  // Write back
  await Bun.write(CLAUDE_CONFIG_PATH, JSON.stringify(claudeConfig, null, 2));

  console.log("\nMCP configuration installed successfully!");
  if (added.length) console.log(`  Added: ${added.join(", ")}`);
  if (updated.length) console.log(`  Updated: ${updated.join(", ")}`);
  console.log(`\nRestart Claude Code to apply changes.`);
}

main().catch((err) => {
  console.error("Error:", err.message);
  process.exit(1);
});