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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.229

Remote sessions can accept much longer heartbeat intervals from the server

You'll notice
Useful2 Signal3
Remote Control

Idle remote sessions can now check in far less often when the server says so.

What

An idle remote session can now beat far less often when the server asks it to. The upper limit on a server-advised heartbeat interval was a flat 900000 ms; it is now effectively unbounded, still capped by the session token's lifetime.

Details
  • Only applies when the caller advertises heartbeat probe support, which defaults to off; without it the ceiling stays 300000 ms.
  • The new ceiling is computed as the maximum 32-bit integer divided by one plus the jitter fraction.
Evidence

cli_heartbeat_interval_updated

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.229 →