Broaden tool-use guidance to cover capability-based tools
The previous wording ("requires external or real-time data") was too
narrow and could suppress legitimate tool calls like image generation
or code execution. Reword to "requires capabilities you lack (e.g.,
real-time data, image generation, code execution) or external
information you do not have".
Addresses review feedback in PR #2155.
https://claude.ai/code/session_0151FUrN7XkXeS4FNhB9mz4C
