Félix Malfait
6ac8ebcd18
## Rationale `StreamAgentChatJob` is the most failure-sensitive path in the AI chat stack — it coordinates the model stream, Redis event publishing, message persistence, the thread's stream claim, and the queued-message flush — and it had **zero unit coverage**. Both historical hangs lived here: - a throw before the model stream merges bypassed `onFinish` entirely and hung the job until the **10-minute BullMQ lock** expired (thread stuck the whole time); - a throw inside `onFinish` (persistence failure) left trailing chunks published with **no terminal event** — the client spinner ran forever. Production still shows this class is live: `Query read timeout` thrown from inside `handleStreamFinish` ([TWENTY-SERVER-GV7](https://twenty-v7.sentry.io/issues/TWENTY-SERVER-GV7)). ## Why this shape, not something else Tests-only PR, zero production risk. The fake chat stream mirrors the one AI SDK contract the job's coordination depends on — verified against the installed `ai@6.0.97` dist: `toUIMessageStream` converts mid-stream errors into error parts and **always** fires `onFinish` when the stream ends (`handleUIMessageStreamFinish` invokes it from both `flush()` and `cancel()`). Pinning that contract in the fake means a future SDK upgrade that breaks it fails these tests instead of production. Six tests pin current behavior: chunk ordering with `message-persisted` last, opaque error-chunk suppression, mid-stream failure persisting `lastStreamError` + releasing the claim, the two hang regressions above, and cancel skipping the queued flush. Three sibling PRs extend this exact spec file (missing-workspace routing, halted queue, and — later — auto-retry), which is why the harness lands first. ## User impact None directly; it makes the two worst historical user-facing hangs (10-minute dead thread, infinite spinner) regression-proof before the stuck-state fix series touches this code. ## Test plan - [x] 6 unit tests, no production code changed - [ ] CI green https://claude.ai/code/session_01Lyi6zTema2FMVVh8MD6c38 --- _Generated by [Claude Code](https://claude.ai/code/session_01Lyi6zTema2FMVVh8MD6c38)_ <!-- This is an auto-generated description by cubic. --> <a href="https://cubic.dev/pr/twentyhq/twenty/pull/22479?utm_source=github" target="_blank" rel="noopener noreferrer" data-no-image-dialog="true"><picture><source media="(prefers-color-scheme: dark)" srcset="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://www.cubic.dev/buttons/review-in-cubic-light.svg"><img alt="Review in cubic" src="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"></picture></a> <!-- End of auto-generated description by cubic. -->
The #1 Open-Source CRM
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Why Twenty
Twenty gives technical teams the building blocks for a custom CRM that meets complex business needs and quickly adapts as the business evolves. Twenty is the CRM you build, ship, and version like the rest of your stack.
Learn more about why we built Twenty
Installation
Cloud
The fastest way to get started. Sign up at twenty.com and spin up a workspace in under a minute, with no infrastructure to manage and always up to date.
Build an app
Scaffold a new app with the Twenty CLI:
npx create-twenty-app my-app
Define objects, fields, and views as code:
import { defineObject, FieldType } from 'twenty-sdk/define';
export default defineObject({
nameSingular: 'deal',
namePlural: 'deals',
labelSingular: 'Deal',
labelPlural: 'Deals',
fields: [
{ name: 'name', label: 'Name', type: FieldType.TEXT },
{ name: 'amount', label: 'Amount', type: FieldType.CURRENCY },
{ name: 'closeDate', label: 'Close Date', type: FieldType.DATE_TIME },
],
});
Then ship it to your workspace:
npx twenty app:publish --private
See the app development guide for objects, views, agents, and logic functions.
Self-hosting
Run Twenty on your own infrastructure with Docker Compose, or contribute locally via the local setup guide.
Everything you need
Twenty gives you the building blocks of a modern CRM (objects, views, workflows, and agents) and lets you extend them as code. Here's a tour of what's in the box.
Want to go deeper? Read the 
User Guide for product walkthroughs, or the Documentation for developer reference.
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Learn more about version control in doc
Stack
TypeScript
Nx
NestJS, with BullMQ, 
PostgreSQL, 
Redis
React, with Jotai, Linaria and Lingui
Thanks
Thanks to these amazing services that we use and recommend for code review (Greptile), catching bugs (Sentry) and translating (Crowdin).
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