Portkey
AI gateway with guardrails for production agents.
Portkey builds an AI gateway that routes across 1,600+ models with integrated guardrails — caching, fallbacks, load balancing, rate limiting and observability — the control plane between a harness and every model provider. Strong presence in the APAC market.
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Modal
Serverless cloud built for AI and agentic compute.
Modal lets teams run inference, fine-tuning and arbitrary agent workloads as serverless Python without managing infrastructure — a common substrate for harness backends at scale.
Temporal
Durable execution for long-running agent workflows.
Temporal's durable execution engine is widely adopted to make agent pipelines reliable: state survives crashes, retries are automatic, and workflows run for minutes or months. A key piece of serious harness infrastructure.
Inngest
Durable functions and workflows for AI agents.
Inngest runs agent logic as durable steps — queueing, retries, concurrency control and human-in-the-loop waits — without operating your own workflow infrastructure.