Lgcodegen Graph Spec

Let me describe the pseudocode shown below, for specifying a langgraph graph we can run.

• Comment lines begin with '#'.

• The first word in the first non-comment line is the name of a State class. The State class holds information needed during the graph execution.

For example:

# description of node_1 behavior
node_1 -> node_2

These lines are the specification for node_1.

In some cases, node_1 might need to choose its destination

# node_1 might go to either node_2 or node_3
node_1 -> router_function(node_2, node_3)

The router function is similar to the Node function in that it takes the State as a parameter. It differs in the return value: the router function returns a string, the name of the node function to route to.

• In all other non-comment lines, the first word in the line (excluding lines that start with white space) is the name of a Node function. The Node function takes the State class as a parameter.

The fields stored in State are based on what the nodes do.

Everything we ask for, any sort of user input, we save in the State, in either a field or a list. Every response that is generated, we also save in the State.

The text in the pseudocode are function names, there are no state fields named.

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