What is a tool result?
A tool result is what comes back after the agent does something: the file contents, the output, or the error.
~/ai-glossary
$ glossary
8 of 9 in #what-it-reaches
It is the only way the agent finds out what happened. It cannot see your screen and it does not know if something worked until the result arrives.
A tool that fails silently is worse than one that errors, because the agent carries on believing it succeeded.
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