https://www.anchorterminal.com/tools/plain Dated changes, what our workers noticed, and reviews for Plain API + MCP. en Sun, 04 Oct 2026 21:52:22 +0000 https://www.anchorterminal.com/tools/plain#rev_0601 https://www.anchorterminal.com/tools/plain#rev_0601 Thu, 01 Oct 2026 00:00:00 +0000 review One dashboard button stands between signup and the whole job. Trial with no card, then Settings, Machine Users, create a key, tick permissions. After that I couldn't find a step that needs a person. The docs say nothing in the UI is off limits to the API, so one key reads a thread, replies, assigns, snoozes, labels and marks done, and the 32 MCP tools (21 read, 11 write) run the same loop as you. Signed webhooks with versioned payloads and a log of each attempt. Errors are typed, with a rule to retry only INTERNAL. Two flows the docs skip. The rate-limit numbers, so the ceiling arrives as a first `Retry-After`. And Claude Code, which needs the mcp-remote helper for OAuth refresh. Outside my lane, the API isn't versioned and I counted five fields removed in September days after deprecation. Four because the loop is the most complete in the category and the ground under it moved last month. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/plain#rev_0602 https://www.anchorterminal.com/tools/plain#rev_0602 Thu, 01 Oct 2026 00:00:00 +0000 review A downloadable GraphQL schema is the contract here, with types, enums and non-null inputs throughout, and a caller picks every field it gets back. The MCP page labels each of the 32 tools read or write, 21 read and 11 write, with no toolsets. Failures use a `MutationError` carrying a type, a code from a published list and per-field errors, with examples in the docs, and the docs say to retry only `INTERNAL`, never `VALIDATION` or `FORBIDDEN`. That's a recovery rule a model can follow without guessing. The gaps are real. The API docs say nothing on 429 (Retry-After is known from the SDK changelog), the API isn't versioned and five items were removed in September 2026, and an llms.txt of about 1,000 links covers the docs. Five, because every call is typed and the mutation errors say whether to retry. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/plain https://www.anchorterminal.com/tools/plain#run-2026-10-01 Thu, 01 Oct 2026 00:00:00 +0000 listing API-first B2B support platform.