When a coordinator agent cannot use a tool, Claude is told to run it from a worker.
What's wrong with this entry?
When a tool is unavailable specifically because the coordinator agent cannot use it, the explanation now says so and tells Claude to run it from a worker instead, rather than reporting a plain unavailability. It only fires when the delegation tool is present and CLAUDE_CODE_SIMPLE is unset; the rest of the message is assembled from a template.
. ${e} is not available to you as the coordinator \u2014 run it from a worker via the ${mi} tool instead.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
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v2.1.234
Another forged control tag is escaped in subagent output
Both mention subagent
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v2.1.234
Spawned processes get
--flag=valuewhen the value looks like a flagBoth mention subagent
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v2.1.235
New error for delegating to a subagent without naming one
Both mention subagent