What causes "Assistants API key not provided. Please provide it again." in danny-avila/LibreChat?

Set ASSISTANTS_API_KEY in the server environment/.env and restart.

Assistants API key not provided. Please provide it again.

Error message

Assistants API key not provided. Please provide it again.

What it means

Thrown when no API key is available at all for the Assistants endpoint: the server is not configured with ASSISTANTS_API_KEY and the user did not provide one. This is the non-user-provided-key branch failure, indicating server-side configuration is incomplete.

Source

Thrown at api/server/services/Endpoints/assistants/initalize.js:40

  let apiKey = userProvidesKey ? userValues.apiKey : ASSISTANTS_API_KEY;
  let baseURL = userProvidesURL ? userValues.baseURL : ASSISTANTS_BASE_URL;

  const opts = {
    defaultHeaders: {
      'OpenAI-Beta': `assistants=${version}`,
    },
  };

  if (userProvidesKey & !apiKey) {
    throw new Error(
      JSON.stringify({
        type: ErrorTypes.NO_USER_KEY,
      }),
    );
  }

  if (!apiKey) {
    throw new Error('Assistants API key not provided. Please provide it again.');
  }

  if (baseURL) {
    opts.baseURL = baseURL;
  }

  const proxyDispatcher = getProxyDispatcher(PROXY);
  if (proxyDispatcher) {
    opts.fetchOptions = {
      dispatcher: proxyDispatcher,
    };
  }

  if (OPENAI_ORGANIZATION) {
    opts.organization = OPENAI_ORGANIZATION;
  }

  /** @type {OpenAIClient} */

View on GitHub (pinned to 5ff282f900)

Solutions

Set ASSISTANTS_API_KEY in the server environment/.env and restart.
If using user-provided keys, ensure the user supplies one (which instead yields the no_user_key error).
Verify the variable name matches what the loader reads (ASSISTANTS_API_KEY).
Confirm the env file is loaded in the running process.

Example fix

# .env
ASSISTANTS_API_KEY=sk-...

Defensive patterns

Strategy: validation

Validate before calling

if (!process.env.ASSISTANTS_API_KEY && !userValues?.apiKey) {
  throw new Error('Server is missing ASSISTANTS_API_KEY');
}

Type guard

function hasAssistantsKey(env, userValues) {
  return Boolean(env?.ASSISTANTS_API_KEY || userValues?.apiKey);
}

Try / catch

try { await initialize(req, res, version); }
catch (e) { if (/API key not provided/.test(e.message)) return res.status(500).json({ error: 'Server misconfigured: ASSISTANTS_API_KEY missing' }); throw e; }

Prevention

Set ASSISTANTS_API_KEY in .env and verify it loads at startup.
Add a startup health check that fails fast if the key is absent.
Keep the variable name consistent with the loader.

When it happens

Trigger: userProvidesKey is false (or no user key given) and ASSISTANTS_API_KEY is unset/empty, so apiKey resolves to a falsy value.

Common situations: Fresh deployment missing the ASSISTANTS_API_KEY environment variable; .env not loaded; the key was removed during a config rotation; typo in the variable name.

Related errors

AI-assisted analysis of danny-avila/LibreChat@5ff282f900 (2026-08-12). Data as JSON: /api/errors/d8afa3c05015ff08. Report an issue: GitHub.