LLMs for complex workflows - where does it actually work vs where it falls apart
been thinking about this a fair bit lately. the use cases where LLMs genuinely simplify things seem to cluster around text-heavy, unstructured stuff:, pulling fields out of contracts, triaging support tickets, converting data between formats, that kind of thing. once there's ambiguity or judgment involved, an LLM handles it way better than trying to hardcode rules that break every two weeks. the inbox automation post on here recently kind of nailed it - deterministic tools doing judgment jobs is where things fall over. the pattern that actually works in production seems to be hybrid: traditional workflow engine, for reliability, permissions, and audit trails, LLM for the classification and routing and exception handling. not LLMs replacing everything, just slotting into the parts where rigid logic fails. worth noting though - even in those slots, you still need schema validation and human review on anything high-stakes. LLMs are still probabilistic and will hallucinate, so treating their output as a confident final answer without checks is where things quietly go sideways. workflow decomposition helps heaps too - breaking it into small schema-validated steps rather than one big prompt trying to do everything at once. reduces hallucinations and makes it way easier to debug when something goes wrong. with agentic setups getting more mature now, adding branching, loops, and human-in-the-loop checkpoints at the right spots makes a real difference for reliability. the build vs buy question is where i'm less sure. for anything regulated, high-stakes, or touching data sovereignty concerns, custom pipelines still seem like the, safer move - compliance and privacy requirements alone can rule out a lot of off-the-shelf options. but for most standard stuff n8n or similar gets you there faster. curious whether people here are finding the out-of-the-box tools actually hold up at scale or if you eventually hit a wall and end up building custom anyway.