jackwener/OpenCLI · error · CommandExecutionError

Failed to add @${username} to list ${listId}: no member_coun

Error message

Failed to add @${username} to list ${listId}: no member_count in response

What it means

A CommandExecutionError from buildListAddMemberRow thrown when the add-member response contains neither a member_count nor any fatal GraphQL errors. The library uses member_count as its success signal, so an absent count means the mutation's outcome cannot be verified and the command is treated as failed.

Source

Thrown at clis/twitter/list-add-core.js:71

export function buildListAddMemberRow({ addResult, memberCountBefore, listId, username, userId }) {
    if (!addResult?.httpOk) {
        throw new CommandExecutionError(
            `Failed to add @${username} to list ${listId}: HTTP ${addResult?.status ?? 0}${addResult?.fetchError ? ' (' + addResult.fetchError + ')' : ''}${addResult?.raw ? ' — ' + addResult.raw : ''}`
        );
    }

    // X often returns a partial GraphQL error on `default_banner_media_results`
    // even on successful mutations. Treat only missing main data or non-decode
    // GraphQL errors as command failures.
    const hasMemberCount = addResult.mc !== null && addResult.mc !== undefined;
    const fatalErrors = fatalGraphqlErrors(addResult.errors);
    if (!hasMemberCount && fatalErrors.length) {
        const msg = fatalErrors.map((e) => e.message || JSON.stringify(e)).join('; ');
        throw new CommandExecutionError(`Failed to add @${username} to list ${listId}: ${msg.slice(0, 300)}`);
    }
    if (!hasMemberCount) {
        throw new CommandExecutionError(`Failed to add @${username} to list ${listId}: no member_count in response`);
    }

    const memberCountAfter = Number(addResult.mc);
    if (!Number.isFinite(memberCountAfter)) {
        throw new CommandExecutionError(`Failed to add @${username} to list ${listId}: invalid member_count in response`);
    }

    if (memberCountAfter < memberCountBefore) {
        throw new CommandExecutionError(
            `Failed to add @${username} to list ${listId}: member_count decreased unexpectedly (${memberCountBefore} → ${memberCountAfter})`
        );
    }

    const countIncreased = memberCountAfter > memberCountBefore;
    const noop = !countIncreased;
    if (noop && addResult.isMember !== true) {
        throw new CommandExecutionError(
            `Failed to add @${username} to list ${listId}: member_count unchanged and membership was not confirmed`

View on GitHub (pinned to 49907e53dc)

Solutions

1. Update this library to the latest version to pick up fixes for X's current response schema.
2. Retry after a short wait — intermittent bot-check pages can produce empty payloads.
3. Refresh session cookies; a logged-out or challenged session may receive degraded responses.
4. Inspect the raw response (enable debug logging) to confirm what X actually returned and file an issue if the schema changed.

Example fix

// before: outdated library parses old schema
await listAddUser(page, { listId: '123456789', username: 'alice' });
// after
npm update <this-cli-package>  # then rerun the list-add command

null

function hasVerifiableMemberCount(r) {
  return r?.mc !== null && r?.mc !== undefined;
}

let lastErr;
for (let i = 0; i < 3; i++) {
  try { return await listAddUser(page, { listId, username }); }
  catch (e) {
    if (!/no member_count in response/.test(e.message)) throw e;
    lastErr = e;
    await sleep(5000 * (i + 1));
  }
}
throw lastErr;

When it happens

Trigger: addResult.mc is null/undefined, fatalGraphqlErrors() returns empty, and HTTP was ok — X returned a success-shaped but structurally unexpected payload (schema drift or a non-mutation response).

Common situations: X changing the GraphQL response shape (version drift); hitting an unexpected page/redirect that returned HTML parsed as an empty payload; a bot-checked response stripped of data.

Related errors

• Failed to add @${username} to list ${listId}: ${msg.slice(0,
• Failed to add @${username} to list ${listId}: invalid member
• Failed to add @${username} to list ${listId}: member_count u
• ${probe.detail}
• 12306 whoami failed: ${probe.detail}

AI-assisted analysis of jackwener/OpenCLI@49907e53dc (2026-08-29). Data as JSON: /api/errors/07d4e09a995afae5. Report an issue: GitHub.