Short answer: LangGraph and similar libraries give you the building blocks for a multi-agent graph — nodes, edges, state. What they don't give you is the guarantees around that graph: validated routing, durable handoff persistence, bounded chains, execution tracing. Building those is on you. Anter ships them as the runtime's default behavior.
A library is not a platform
Orchestration libraries like LangGraph, LlamaIndex, and hand-rolled routing on top of raw model APIs share a common shape: they hand you the primitives to construct a multi-agent graph, and everything past that — is a given transfer actually allowed, does a crashed run resume where it left off, can you reconstruct why an agent routed the way it did last week — is left as engineering work for your own team to design, build, and maintain.
None of that is a criticism of the libraries themselves. It's a genuine, deliberate trade-off: full control over every layer, in exchange for owning every layer.
What "already built" concretely means on Anter
Where a library-first approach requires building the surrounding infrastructure, Anter's execution model ships it as default runtime behavior:
- Validated routing — every transfer and delegation checked against a write-time allowlist and a runtime existence check, not left to whatever the graph code currently does.
- Durable handoff persistence — each handoff is written as a structured routing event atomically, before the next step executes, so a crash mid-run doesn't lose the trace of what happened.
- Bounded chains — an exact cycle guard, hop-depth ceiling, and step-budget decay apply to every cross-agent dispatch, by construction.
- Full observability — per-run OpenTelemetry spans and a step-by-step execution trace, without instrumenting it yourself.
When a library is still the right call
If a team wants full architectural control, is comfortable owning the operational surface, or has requirements a managed platform's opinions don't fit, a library-first approach is a reasonable choice — that trade-off is real, not a sales point to argue away. The relevant question is whether that ownership is differentiating work for the product being built, or infrastructure the roadmap would rather not carry.
See the full side-by-side comparison for how Anter compares to Claude Managed Agents, OpenAI AgentKit, CrewAI, and Base44 on the same dimensions.