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symfonic.agent.cutover.errors

errors

The one exception the migrated run raises that legacy also raised.

An exhausted round budget is the only failure whose type an adopter's code already keys on: the legacy body lets LangGraph's GraphRecursionError propagate out of SymfonicAgent.run, so except GraphRecursionError is documented, working adopter code today. A cutover that swapped it for a SymfonicAgentError would keep "parity of kind" — both still fail loudly — while breaking the observable the except clause actually reads, and the turn would sail past the handler into the caller's top-level catch.

So the migrated path raises a type that is both. The ancestry is a widening, never a rename: except GraphRecursionError catches exactly what it caught before the flip, except SymfonicAgentError (and except SymfonicError) catch it too, and the message says which budget ran out.

RecursionExhaustedError 

RecursionExhaustedError(message: str, code: str | None = None)

Bases: GraphRecursionError, SymfonicAgentError

The invocation used every model round its budget allows.

Inherits from both hierarchies on purpose — see the module docstring. The LangGraph base comes first so GraphRecursionError's own args handling wins, and SymfonicAgentError.__init__ still supplies the optional code.

Source code in src/symfonic/agent/cutover/errors.py 
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def __init__(self, message: str, code: str | None = None) -> None:
    SymfonicAgentError.__init__(self, message, code)