Diagnose a deployed Stylus program that cannot execute
A nonempty code response does not by itself make a Stylus contract callable. Deployment puts the program on chain, while activation prepares its code hash for execution under ArbOS.
Check deployment and activation separately
Verify the deployment receipt and expected program code hash on the target Arbitrum chain. Then use Stylus-aware tooling or the supported ArbWasm queries to inspect activation status for that program under the current chain rules.
address A: deployed WASM code hash H
ArbWasm: H has no current activation
In the example the deployment exists, but a fresh address or a second deployment of the same bytes does not establish activation. Multiple instances can share activation for identical code hashes, so resolve the hash before estimating activation work.
Check chain policy before attempting activation
Activation eligibility, expiry and permitted operations depend on the chain and ArbOS state. Consult current chain notices for restrictions or pauses. When reporting readiness, distinguish deployed code, active code and a successful test call through the intended ABI. docs.arbitrum.io Arbitrum documentation