tool_load always re-reads the tool from disk (reload semantics).
tool_list calls RefreshLoaded to update schemas for all promoted tools.
Skills registry gets the same treatment: dynamic discovery, no cache.
Registry.Summaries() and Load() now scan the tools directory on every
call instead of reading from a startup cache. New tools dropped into
the directory are immediately visible without restarting the server.
When tool_list is called, the OnToolsChanged hook fires and updates
the preamble's '# Available Tools' section in the live agent runtime.
No agent reload or session restart required.
Levi Neely