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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 v2.1.242

Session journal keys are checked for consistency

Under the hood
Useful1 Signal1
Sessions

A key naming a session's own journal is rejected if it also carries agent or run details.

What

A key that names a session's own journal is now rejected if it also carries an agent id, an agent path or a run journal, with a message spelling out the rule.

Evidence

a session journal key names the session's own journal: no agentId, agentRelPath or run journal

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

See this entry in the whole of v2.1.242 →