Eric Allam
82853debea
## Summary Long-running chat agents were filling `session.out` forever — every `chat.agent` turn appended to the same S2 stream with no trim, and the Sessions dashboard re-streamed the entire history from `seq_num=0` on every page load. After this change the agent appends an S2 `trim` command record after each `trigger:turn-complete`, pointing back at the previous turn-complete's seq_num. `session.out` stays roughly one turn long at steady state, regardless of session age. `trigger:turn-complete` and `trigger:upgrade-required` move from `chunk.type`-shaped data records into header-form control records under a uniform `trigger-control` namespace. Built-in transports (`TriggerChatTransport`, `AgentChat`, the dashboard's `AgentView`) handle the new shape transparently. Custom transports need a one-line filter on the `trigger-control` header — see the rewritten "Records on session.out" section in the client-protocol docs. The Sessions detail page in the dashboard fetches the agent's per-turn S3 snapshot via a presigned URL and seeds the transcript view, then SSE-tails from the snapshot's `lastOutEventId`. Bandwidth and time-to-first-render scale with unread turns instead of session lifetime. Resume contract is now explicit: single-turn-boundary resume always works (the prior turn-complete is still on the stream), the S2 trim is eventually consistent over 10-60s, and multi-turn-away resume falls back to a snapshot reload.
Official TypeScript SDK for Trigger.dev
The Trigger.dev SDK is a TypeScript/JavaScript library that allows you to define and trigger tasks in your projects.
About Trigger.dev
Trigger.dev is an open source platform for building and deploying fully-managed AI agents and workflows. Write workflows in normal async TypeScript for everything from simple tasks to long-running AI agents, heavy media processing, complex real-time systems and more. Complete with full observability, managed queues, and elastic infrastructure which handles the horizontal scaling.
Core features
- Task creation and execution
- CLI for development and deployment
- Build system with extensions
- Management API for runs, schedules, and environment variables
Key Components:
- Tasks: Background jobs written in TypeScript/JavaScript
- CLI: Commands for login, init, dev, deploy
- Build Extensions: Customize builds (Prisma, Python, FFmpeg, etc.)
- Management API: Programmatic control over runs and resources
Getting started
There are two ways to get started:
- Create an account in our web app, create a new project and follow the instructions in the onboarding. Build and deploy your first task in minutes.
- Manual setup in your existing project.
SDK documentation
For more information on our SDK, refer to our docs.
Support
If you have any questions, please reach out to us on Discord and we'll be happy to help.