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The API is on version 2026-10-12. Darwin adds new fields, endpoints, events and tools without a new version, so everything below is additive unless it says otherwise. How versions work: Versioning.
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APIMCPSDK 0.3.0
Opening tests from your own code

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Run opening tests yourself

Your own code or AI assistant can now decide what to test on which page and write the openings, while Darwin shows each visitor one opening and scores them all.
  • POST /experiments starts a test of your own openings on a page, a page type, a page group or the whole site, against what it shows now. GET /experiments/{id} carries live results worked out now.
  • PATCH and DELETE /experiments/{id}/variants/{variantId} change or remove an opening.
  • /page_openings: what any page shows now and why (GET /page_openings/current), and a page’s or section’s own opening.
  • MCP: create_experiment, edit_opening, remove_opening, get_page_opening, list_page_openings, set_page_opening, reset_page_opening and set_test_automation.
  • @meetdarwin/api 0.3.0 adds experiments.create, updateVariant, deleteVariant and pageOpenings.
Guide: Run opening tests with your own AI assistant.
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APIWebhooksMCPSDK 0.2.0
Outcome forms, personal links and credits
  • /outcomes: build outcome forms from a template or your own questions with fit rules, and switch them live. PATCH /outcomes/meeting sets Book a meeting’s questions. /outcome_requests lists what visitors sent.
  • /personal_links with POST /personal_links/{id}/urls for each person’s own address, /link_greetings and /link_visits.
  • New webhook event personal_link.opened.
  • New error codes plan_required (403, with the plan that unlocks it) and goal_required (409: the change would leave a live agent with no calendar or live form).
  • The API, the MCP server and the chat API are on every plan, Free included, with the same rate limits on every plan.
  • MCP: tools for outcome forms, personal links and greetings.
  • @meetdarwin/api 0.2.0 adds outcomes, personalLinks, linkGreetings and linkVisits.
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MCPWebhooks
Chat buttons over MCP and a new connect screen

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Chat buttons and outcome requests

  • MCP: create_chat_button, update_chat_button, delete_chat_button and list_chat_buttons.
  • Connecting an assistant shows the workspace with Switch, and Full access or View only.
  • New webhook event outcome.submitted, with every answer the visitor gave.
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APIWebhooksMCPSDK 0.1.0
Darwin API 2026-10-12

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The Darwin developer platform

The first public version of the API, 2026-10-12.
  • REST API for conversations, contacts, meetings, analytics, events, knowledge, the agent, its appearance, chat buttons and opening tests, with scoped keys, cursor pagination and idempotent writes.
  • Webhooks signed with Standard Webhooks, with retries over three days and redelivery.
  • The browser SDK, the chat API and the MCP server for Claude, ChatGPT, Claude Code and Cursor.
  • Privacy requests: export or erase one person’s data.
  • @meetdarwin/api 0.1.0, the TypeScript SDK.