CREATE LANG PLUGIN

A lang plugin is a single CommonJS file at <projectDir>/lang/<id>.js. gm-cc's hooks auto-discover it — no hook editing, no settings changes. The plugin gets three integration points: exec dispatch, LSP diagnostics, and context injection.

PLUGIN SHAPE

'use strict';
module.exports = {
  id: 'mytool',                          // must match filename: lang/mytool.js
  exec: {
    match: /^exec:mytool/,               // regex tested against full "exec:mytool\n<code>" string
    run(code, cwd) {                     // returns string or Promise<string>
      // ...
    }
  },
  lsp: {                                 // optional — synchronous only
    check(fileContent, cwd) {            // returns Diagnostic[] synchronously
      // ...