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Comment by seg_lol

20 days ago

HN is technical but not that technical. Next time explain why "Affine MultiParty Session Types for Rust" are cool! And maybe how they relate to choreographies and choreographic programming.

Thanks for sharing, this looks cool.

3 comments

seg_lol

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o8vm  20 days ago

Thank you — this is very helpful feedback.

You’re absolutely right that I led with terminology instead of value. A simpler way to describe it is:

Hibana helps prevent protocol drift bugs in distributed systems. You describe the interaction once as a global choreography, and each role gets a projected local API. Because steps are affine (consumed once), invalid transitions like skipping, reusing, or taking the wrong branch are rejected by the type/protocol model.

So the practical goal is fewer hidden state-machine bugs, with one global source of truth for interaction order.

I appreciate the suggestion, and I’ll explain it this way in the next write-up.

  • antonvs  16 days ago

    Examples would help.

    • o8vm  15 days ago

      Here is an example of how a protocol defined in Hibana can confine even an AI agent’s behavior within an explicit interaction flow.

      https://github.com/hibanaworks/hibana-agent

      From an AMPST perspective, the key idea is this: one global choreography is projected into role-local protocols (Agent/Browser/Human), with affine progression (each step is consumed exactly once).

        const LOOP_BODY: g::Program<LoopBodySteps> = g::seq(
      g::send::<Agent, Browser, BrowserAction, 0>(),
      g::send::<Browser, Agent, BrowserObservation, 0>(),
  );
  
  const ADD_TO_CART_APPROVAL: g::Program<AddToCartApprovalSteps> = g::seq(
      g::send::<Agent, Human, RequestApproval, 0>(),
      g::seq(
          g::send::<Human, Agent, ApprovalDecision, 0>(),
          g::route::<0, _>(
              g::route_chain::<0, AddToCartArm>(ADD_TO_CART_ARM)
                  .and::<SkipAddToCartArm>(SKIP_ADD_TO_CART_ARM),
          ),
      ),
  );

      So even AI-agent behavior is confined by protocol structure: illegal traces (skip/reorder/reuse/wrong branch) are unrepresentable, not merely blocked by ad hoc runtime checks.

      As another example, we’re also preparing `hibana-quic` (a QUIC implementation built with Hibana) for public release. It already passes interop tests with neqo.