I got 403 plan_required or model_not_in_plan from an old tool. What now?

Both were removed on October 31, 2026: the Agent API works on every plan, and every plan has every model. If an old tool still mentions them, update it (for Line CLI, line update).

Good to know#

• Limit errors include resets_at (UTC) and a Retry-After header.
• 402 out_of_credits means credits, not plan limits.
• Never retry limit errors in a tight loop.

Learn more#

• API errors reference
• Plans and credits

Still need help?#

• General support: support@clatterlabs.com or team@clatterlabs.xyz
• Infrastructure questions, or permanent deletion of your data (your whole account or one service): infrastructure@clatterlabs.xyz

We usually reply within the first hour, and always within 24 hours. A full support team is with you.