It is technically a legal document, and it is binding. Which makes it unique from other types of documents. I’m not sure what you mean in regards to “tool”. But I would think it would be considered a reference document
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The primary causes were that Sparta feared of the growing power and influence of the Athenian Empire. The Peloponnesian war began after the Persian Wars ended in 449 BCE. This disagreement led to friction and eventually outright war. Additionally, Athens and its ambitions caused increasing instability in Greece.