The h2A (Half-to-Half Asynchronous) message queue introduced by Claude Code is the core technology of its real-time Steering mechanism. This innovative communication architecture solves the common problem of response latency in AI systems.
The h2A queue is designed with double buffering:
- Maintain two separate buffer queues simultaneously (A/B)
- Write and read operations are executed in parallel on separate buffers.
- Seamless data flow through timed switching
The system is realized:
- Zero-latency response for messaging
- Efficient back pressure control mechanism
- 99.91 TP3T service availability
- Ability to process over 5000 messages per second
This technology provides key underlying support for real-time AI interaction systems.
This answer comes from the articleanalysis_claude_code: a library for reverse engineering Claude Code.The
May not be reproduced without permission:AI productivity tools " h2A double-buffered asynchronous message queue technology ensures zero-latency real-time response for Claude Code
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