Notion released Developer Platform 3.5 on May 13, 2026 — the most significant developer-facing update in the company's history. The release introduces four new capabilities that transform Notion from a knowledge workspace into a programmable platform with agentic AI execution.

Workers runtime

Workers runtime allows developers to write and deploy custom serverless JavaScript functions that run directly inside Notion. Logic — automations, data transformations, integrations — lives alongside content rather than in external services. A Notion database can now trigger a function, process the data, call an external API, and write results back — all within the Notion environment without routing through Zapier, Make, or custom backend infrastructure.

Database Sync

Database Sync adds two-way, bidirectional connections between Notion databases and external data sources including SQL databases and third-party APIs. Unlike Notion's previous one-way data imports, changes made in Notion are now reflected in the external system and vice versa. Notion becomes a live operational interface rather than a static copy of external data — enabling use cases like a Notion-based CRM that stays synchronized with Salesforce or a product database connected to a PostgreSQL backend.

Bidirectional Webhooks and Plan Mode

Bidirectional Webhooks extend the event model in both directions: Notion can receive incoming webhooks from external services to trigger workflows and send outgoing webhooks when Notion content changes. Plan Mode is a new AI agent capability: agents reason about multi-step tasks, create a plan, execute each step, and adapt when circumstances change — behaving autonomously on structured Notion knowledge bases rather than responding to single prompts.

Why it matters

Developer Platform 3.5 positions Notion as a platform where AI agents operate on structured, interconnected data rather than just on documents. For teams already using Notion as their operational hub, Workers and Database Sync unlock automation and integration capabilities that previously required dedicated engineering work. For AI builders, Plan Mode with bidirectional data access opens Notion databases as a substrate for autonomous agent workflows.