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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 v2.1.75 13 Mar 2026

Concurrent Session Detection

What

Claude Code now detects when multiple sessions are running simultaneously and offers a relevant tip.

Details

Sessions register PID files in the Claude Code data directory
When 2+ sessions are detected, a tip suggests: "Running multiple Claude sessions? Use /color and /rename to tell them apart at a glance."
Session count is also reported via telemetry (tengu_concurrent_sessions)

Evidence

Concurrent session tracking (search for "concurrentSessions", "color-when-multi-clauding")

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

See this entry in the whole of v2.1.75 →