Show HN: I ran every Claude agent turn through the Batch API

Category: devtools

Tags: agent-harness, batch-api, anthropic

Score: 6.0/10 (Innovation: 6, Technical: 6, Documentation: 8, Utility: 4)

A minimal agent harness that routes every model turn through Anthropic's Batch API to save 50% on costs, with a rich terminal UI and sandboxed bash tool execution. It's interesting for exploring whether batched agent runs can be practical despite asynchronous latency, especially for multi-agent or eval workloads.

Target audience: backend devs

Repository: https://eran.sandler.co.il/post/2026-04-27-batch-api-is-terrible-for-one-agent/ · Python · MIT · 3 stars

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