Function removeMcpEntryAt

src/installer/targets/opencode.ts:233–254

* Surgically drop `mcp.codegraph` from one config file. Leaves sibling * servers, comments, and formatting untouched; drops an emptied `mcp` * wrapper too. Shared by uninstall and the legacy-%APPDATA% sweep.

(file: string)

 * wrapper too. Shared by uninstall and the legacy-%APPDATA% sweep.
 */
function removeMcpEntryAt(file: string): WriteResult['files'][number] {
  if (!fs.existsSync(file)) return { path: file, action: 'not-found' };
  const text = readConfigText(file);
  const config = parseConfig(text);
  if (!config.mcp?.codegraph) return { path: file, action: 'not-found' };

  let edits = modify(text, ['mcp', 'codegraph'], undefined, {
    formattingOptions: FORMATTING,
  });
  let updated = applyEdits(text, edits);

  // If `mcp` is now an empty object, drop the wrapper too.
  const afterParsed = parseConfig(updated);
  if (afterParsed.mcp && typeof afterParsed.mcp === 'object' &&
      Object.keys(afterParsed.mcp).length === 0) {
    edits = modify(updated, ['mcp'], undefined, { formattingOptions: FORMATTING });
    updated = applyEdits(updated, edits);
  }

  atomicWriteFileSync(file, updated);
  return { path: file, action: 'removed' };
}

/**
 * Remove whatever a pre-#535 install left in `%APPDATA%/opencode` — an MCP