Unclear Which tool gets added, and which kept tools cause it, is not stated.
What
--tools is a command-line flag that limits which built-in tools Claude can use. When working out the final set of tools, Claude Code now also takes into account the tools you deny on the command line.
If some of the tools you keep meet a certain condition, and no rule denies that tool outright, Claude Code adds one more tool to the kept set. It does not add it if that tool is excluded.
Why
The tools available under --tools may not exactly match the list you give.
Names in the bundle--tools
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
Which tool gets added, and which kept tools cause it, is not stated.