You'll notice
Useful2 Signal2
Old transcripts keep tool calls intact even when the tool no longer exists.
What's wrong with this entry?
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What
Transcript normalisation accepts a list of tool names to keep. Those names are added to the known-tool set and treated as known when rewriting tool call inputs, so historical calls to a tool the current registry no longer offers are not mangled. A companion option lists tool references that were stripped.
Evidence
keptToolNames
Strings lifted out of the shipped bundle, so the claim above can be checked against them.