APort vs Modal
Modal secures execution with user-space kernel isolation. OAP authorizes whether the agent should invoke that execution path at all.
Modal is a developer platform for running agent code in managed containers quickly—valuable for scaling tool-heavy agents.
Use OAP at the agent framework boundary to ensure only entitled agents trigger Modal functions, with parameters bounded by policy.
| Comparison point | OAP / APort | Modal |
|---|---|---|
| Layer of stack | Application/agent integration (hooks, SDKs, verify API). | Cloud execution platform with sandboxed containers. |
| Enforcement type | Allow/deny + obligations encoded in policy packs. | Isolation + infra quotas; not semantic business rules by default. |
| Identity | OAP passport ties decisions to agent + org assurance tier. | Modal auth for your account; separate from agent authorization model. |
| Together | OAP gate → Modal sandbox for approved heavy tools only. | Modal runs what OAP already authorized. |
Use Modal when
- You want fast elastic sandboxes for agent-written code
- You already deploy Python/Node tool servers on Modal
- You need gVisor-class isolation without operating Firecracker yourself
Use OAP / APort when
- You must bind Modal invocations to customer policy and audit
- You run agents in multiple clouds—not only Modal
- You need consistent deny reasons across Modal and non-Modal tools
Why teams choose OAP / APort
Semantic gate first
Stop abusive or out-of-policy Modal calls before they consume GPU time.
Cross-runtime passport
Same policy artifact for Modal, local shells, and SaaS APIs.
Deterministic audit
Signed OAP decisions supplement Modal logs for regulated workflows.