Summary

Introduce client support for the new XREADGROUP … CLAIM <min-idle-time> option so consumers can reclaim idle pending entries (from the group PEL) and read new entries in a single call. When entries are claimed, Redis returns two extra fields per entry:

• msSinceLastDelivery
• redeliveryCount

The client should surface these alongside the stream message.

Motivation

• Reduce round-trips and complexity vs. separate PEL inspection and claim flows.
• Enable a single read path that first yields overdue PEL items (claimed) and then new entries.
• Align with server support that returns additional metadata about claimed entries.

Backward compatibility

• Without CLAIM, behavior is unchanged.
• On servers that don’t support CLAIM, the command will fail with a syntax error; applications can feature-detect or fall back (e.g., XAUTOCLAIM).
• Parsing remains compatible with legacy XREAD/XREADGROUP replies.

References

• Redis Streams: XREADGROUP
• Existing claim flows: XAUTOCLAIM (fallback on older servers)
• https://redis.io/docs/latest/commands/xreadgroup/