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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 v2.1.200

Background Agent Markers: isBackgroundAgent Field

Agent context objects for background (sidecar) agents now carry an isBackgroundAgent: true field. This enables the system to distinguish background agents from in-process subagents without relying on agentType alone.

Evidence

Background agent context update (search for "isBackgroundAgent: !0" near "isMainSession: !0")

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

See this entry in the whole of v2.1.200 →