Function substitutePluginVariables

src/utils/plugins/pluginOptionsStorage.ts:326–344

(
  value: string,
  plugin: { path: string; source?: string },
)

 * Used in MCP/LSP server command/args/env, hook commands, skill/agent content.
 */
export function substitutePluginVariables(
  value: string,
  plugin: { path: string; source?: string },
): string {
  const normalize = (p: string) =>
    process.platform === 'win32' ? p.replace(/\\/g, '/') : p
  let out = value.replace(/\$\{CLAUDE_PLUGIN_ROOT\}/g, () =>
    normalize(plugin.path),
  )
  // source can be absent (e.g. hooks where pluginRoot is a skill root without
  // a plugin context). In that case ${CLAUDE_PLUGIN_DATA} is left literal.
  if (plugin.source) {
    const source = plugin.source
    out = out.replace(/\$\{CLAUDE_PLUGIN_DATA\}/g, () =>
      normalize(getPluginDataDir(source)),
    )
  }
  return out
}

/**
 * Substitute ${user_config.KEY} with saved option values.