This skill should be used when the user asks to "create a Temporal workflow", "write a Temporal activity", "debug stuck workflow", "fix non-determinism error", "Temporal TypeScript", "workflow replay", "activity timeout", "signal workflow", "query workflow", "worker not starting", "activity keeps retrying", "Temporal heartbeat", "continue-as-new", "child workflow", "saga pattern", "workflow versioning", "durable execution", "reliable distributed systems", mentions Temporal SDK development or implementing Temporal stuff (workflows, workers, activities), managing queries, updates and signals for existing workflows or updating the configuration for the Temporal worker and clients from our package packages/workflows such as WorkflowsModule, WorkerService, ClientService, or Workflow utils.
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This skill should be used when the user asks to "create a Temporal workflow", "write a Temporal activity", "debug stuck workflow", "fix non-determinism error", "Temporal TypeScript", "workflow replay", "activity timeout", "signal workflow", "query workflow", "worker not starting", "activity keeps retrying", "Temporal heartbeat", "continue-as-new", "child workflow", "saga pattern", "workflow versioning", "durable execution", "reliable distributed systems", mentions Temporal SDK development or implementing Temporal stuff (workflows, workers, activities), managing queries, updates and signals for existing workflows or updating the configuration for the Temporal worker and clients from our package packages/workflows such as WorkflowsModule, WorkerService, ClientService, or Workflow utils.
allowed-tools
Read, Grep, Glob, Edit, Write
version
0.1.0
Temporal Workflow Development
Overview
Temporal is a durable execution platform that makes workflows survive failures automatically. This skill provides guidance for building Temporal applications.
Core Architecture
The Temporal Cluster is the central orchestration backend. It maintains three key subsystems: the Event History (a durable log of all workflow state), Task Queues (which route work to the right workers), and a Visibility store (for searching and listing workflows). There are three ways to run a Cluster:
Temporal CLI dev server — a local, single-process server started with . Suitable for development and testing only, not production.
temporal server start-dev
Self-hosted — you deploy and manage the Temporal server and its dependencies (e.g., database) in your own infrastructure for production use.
Temporal Cloud — a fully managed production service operated by Temporal. No cluster infrastructure to manage.
Workers are long-running processes that you run and manage. They poll Task Queues for work and execute your code. You might run a single Worker process on one machine during development, or run many Worker processes across a large fleet of machines in production. Each Worker hosts two types of code:
Workflow Definitions — durable, deterministic functions that orchestrate work. These must not have side effects.
Activity Implementations — non-deterministic operations (API calls, file I/O, etc.) that can fail and be retried.
Workers communicate with the Cluster via a poll/complete loop: they poll a Task Queue for tasks, execute the corresponding Workflow or Activity code, and report results back.
History Replay: Why Determinism Matters
Temporal achieves durability through history replay:
Initial Execution - Worker runs workflow, generates Commands, stored as Events in history
Recovery - On restart/failure, Worker re-executes workflow from beginning
Matching - SDK compares generated Commands against stored Events
Restoration - Uses stored Activity results instead of re-executing
If Commands don't match Events = Non-determinism Error = Workflow blocked
Workflow Code
Command
Event
Execute activity
ScheduleActivityTask
ActivityTaskScheduled
Sleep/timer
StartTimer
TimerStarted
Child workflow
StartChildWorkflowExecution
ChildWorkflowExecutionStarted
See references/core/determinism.md for detailed explanation.
Read All Relevant References
First, read the getting started guide for the language you are working in:
