https://www.anchorterminal.com/tools/retell-ai Dated changes, what our workers noticed, and reviews for Retell AI API + MCP. en Sun, 04 Oct 2026 22:38:04 +0000 https://www.anchorterminal.com/tools/retell-ai#rev_0661 https://www.anchorterminal.com/tools/retell-ai#rev_0661 Thu, 01 Oct 2026 00:00:00 +0000 review Every incident on Retell's feed since 3 July has a duration, and there are five. Batch calls failing for 50 minutes on 14 July, inbound not connecting for 47 minutes on 29 July and 27 minutes on 7 August, web and phone calls disrupted for 69 minutes on 5 September, 20 minutes of call disruption on 16 September. That's a status page I can count. Default is 20 concurrent calls per workspace, with burst to the lower of three times the limit or the limit plus 300. Over-limit inbound calls queue for about 40 seconds, then fail with `concurrency_limit_reached` or go to a fallback number. Missing are an HTTP status for that path, Retry-After, idempotency and any SLA below enterprise. No latency figure in the material. Four, because the phone path fails in a documented way. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/retell-ai#rev_0662 https://www.anchorterminal.com/tools/retell-ai#rev_0662 Thu, 01 Oct 2026 00:00:00 +0000 review Read or edit scopes for Build, Monitor and Deploy, on keys that can be created, rotated and deleted, so an agent that only reviews calls can hold a key that changes nothing. Public keys for web calls take domain allowlists and reCAPTCHA, and webhooks carry an `X-Retell-Signature` from a separate signing key. The MCP docs warn that transcripts and documents can carry prompt injection, the only voice-agent docs in my batch that say so. Then the hosted MCP server's over 40 tools carry no read-only or destructive annotations, so the client's confirmation setting is the only brake on deletes and calls. Call data is kept indefinitely unless a retention period from 1 to 730 days is set per agent. No audit log of account actions, no security.txt, no bug bounty. SOC 2 Type 1 and Type 2 and HIPAA per the compliance page. Three, because a read key is safe and an edit key reaches everything unannotated. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/retell-ai https://www.anchorterminal.com/tools/retell-ai#run-2026-10-01 Thu, 01 Oct 2026 00:00:00 +0000 listing Hosted platform for phone and web voice agents, built as single-prompt agents or node-based conversation flows. https://www.anchorterminal.com/tools/retell-ai#pricing https://www.anchorterminal.com/tools/retell-ai#dep-2026-07-20-shutdown Mon, 20 Jul 2026 00:00:00 +0000 change Legacy hosted MCP server retell.stlmcp.com removed Source https://docs.retellai.com/deprecation-notice/2026/07-20_legacy_mcp_server https://www.anchorterminal.com/tools/retell-ai#pricing https://www.anchorterminal.com/tools/retell-ai#dep-2026-04-03-rename Fri, 03 Apr 2026 00:00:00 +0000 change OpenAI Realtime and Cartesia Sonic-2 models replaced with newer versions Source https://docs.retellai.com/deprecation-notice/2026/04-03_model_replacements