💭 I'm reviewing this PR against the Effect service conventions, starting with the new ManagedTunnelLimits.ts service module and how it integrates with the existing ManagedEndpointProvider and the relay contracts. Looking at the structure and error handling, the service follows the conventions well: it uses namespace imports for Effect modules, defines errors with Schema.TaggedErrorClass, and implements the standard Context.Service pattern with make and layer exports in the correct order. The ManagedTunnelLimitPersistenceError is particularly well-designed—it uses a multi-value operation discriminator with a generic message derived from the operation type, which matches the convention for when failures share the same semantics but occur across different operations like loading limits or counting tunnels. However, I'm noticing a potential issue with the cause field. The convention states that cause should be required when every construction wraps a failure, and optional only when the error can legitimately originate without an underlying failure. Looking at both construction sites in the make function, they both pass a cause, which means the field should be required rather than optional—this appears to be a minor violation of the stated convention. For ManagedTunnelLimitExceeded, it's a pure domain error with no cause needed, which is appropriate. On the dependency side, the code correctly acquires the database via Effect.gen and consumes the provider through ManagedTunnelLimits. But I'm spotting a clear convention violation in the error handling: the code uses Effect.catchTag for a single error tag, when the convention explicitly requires using Effect.catchTags instead and forbids catchTag entirely. The file infra/relay/src/environments/ManagedEndpointProvider.ts is in scope, so this is a real issue. The Api.ts change looks fine—it's using a mapper object structure that aligns with catchTags patterns. Now checking the RelayEnvironmentLinkLimitExceededError definition in contracts... I need to verify these potential issues by examining the actual files to confirm whether catchTag vs catchTags is a real inconsistency and whether the cause field should be required rather than optional. I found a violation in ManagedEndpointProvider.ts at line 517 where Effect.catchTag is being used for a single tagged error, but the convention requires Effect.catchTags instead. This is inconsistent since the rest of the file follows the correct pattern with Effect.catchTags on lines 323, 367, and 387. For the second issue, the cause field on ManagedTunnelLimitPersistenceError is marked optional, but every construction site passes a cause value. The convention states that when all constructions provide a cause, it should be required rather than optional. However, I'm noticing that similar errors in the codebase like ManagedEndpointProvisioningFailed use optional cause because they're sometimes constructed without one, so I need to verify whether ManagedTunnelLimitPersistenceError truly has cause in every construction. The code field is a single-value literal, but this appears to be an intentional wire contract pattern for HTTP errors across the repo, not a convention violation, so I'll skip flagging it. The catchTag issue is the strongest finding here—the convention explicitly prohibits using catchTag, so that's the primary violation to focus on. For the cause field in ManagedTunnelLimitPersistenceError, the convention says it should be required if every construction wraps a failure. Both construction sites do pass cause, so this is a legitimate secondary finding worth reporting as well. The primary issue is the catchTag usage that should be catchTags with an object pattern. I'll prepare an inline suggestion that changes the single-tag catch to the multi-value discriminator pattern, though this will require adjusting the closing braces. Writing the refactored catchTags... Both constructions wrap a failure, so I'll flag this as a lower-severity note as well. Now I'm ready to post the review.

1. modify_pr — Effect Service Conventions: found two issues in the new managed tunnel-it service in infra/relay.

💭 I'm reconsidering whether to add a comment about the optional cause parameter. The catchTag is the clear finding I already flagged, but both ManagedTunnelLimitPersistenceError constructions pass cause, which suggests it should be required per convention—a valid but minor point. I could submit a second review comment, though I've already posted the initial one. I'm going back and forth on whether to flag the optional cause as a separate issue. The convention is explicit that if every construction wraps a failure, cause should be required—and that's the case here. But I've already submitted one review, and adding another feels like over-flagging. I'll stick with the single strong finding on catchTag and keep the check as failed. The second review attempt failed since only one review can be submitted per session, but that's okay since I already posted the primary finding about the catchTag violation. I'll include the cause finding in the check summary instead. Now I need to finalize the JSON check run result with a failure state, title, and summary that clearly document this catchTag convention violation.