User { # User
n1: circle label="User sends message"
n2: rectangle label="See agent reply"

n1.handle(right) -> Agent.n3.handle(left)
Agent.n8.handle(right) -> n2.handle(left)
}

Agent { # Agent
n3: rectangle label="Receive message"
n4: rectangle label="Load session history"
n5: rectangle label="Assemble prompt"
n6: rectangle label="Call LLM"
n7: rectangle label="Receive LLM reply"
n8: rectangle label="Return answer to user"
n9: rectangle label="Persist updated session"

n3.handle(right) -> n4.handle(left)
n4.handle(right) -> n5.handle(left)
n5.handle(right) -> n6.handle(left)
n6.handle(right) -> LLM.n10.handle(left)
n7.handle(right) -> n8.handle(left)
n8.handle(bottom) -> n9.handle(top) [label="Save session"]
}

Memory { # Session Store
n11: rectangle label="Read session state"
n12: rectangle label="Write session state"

n3.handle(bottom) -> n11.handle(top) [label="Get history"]
n11.handle(right) -> Agent.n4.handle(left)
Agent.n9.handle(bottom) -> n12.handle(top) [label="Store history"]
}

LLM { # LLM
n10: rectangle label="Generate answer"

n10.handle(right) -> Agent.n7.handle(left)
}