chore: improve serverless refresh error

[MasterPtato]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

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Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
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• I have added tests that prove my fix is effective or that my feature works
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[railway-app]

🚅 Deployed to the rivet-pr-4436 environment in rivet-frontend

Service	Status	Web	Updated (UTC)
website	😴 Sleeping (View Logs)	Web	Mar 16, 2026 at 11:47 pm
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mcp-hub	✅ Success (View Logs)	Web	Mar 16, 2026 at 11:36 pm
ladle	❌ Build Failed (View Logs)	Web	Mar 16, 2026 at 11:35 pm

[MasterPtato]

• chore: improve serverless refresh error #4436 👈 (View in Graphite)
• fix: ignore invalid base64 input #4421
• main

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commit: b4a3ace

[claude]

PR Review: chore: improve serverless refresh error. Small improvement promoting anyhow! to a typed RivetError. Bug: two-arg error macro treats second arg as static string, so the reason placeholder appears verbatim in default_message - needs a third arg for dynamic interpolation. Minor: ServerlessRunnerPool lacks Clone unlike Actor and Runner in the same file. Positives: removing unused anyhow import, cleaner await map_err chain, structured meta payload.

[claude]

PR Review: chore: improve serverless refresh error. Overall: Approved. Small, well-scoped improvement. Summary: (1) engine/packages/pegboard/src/errors.rs adds a new FailedToFetchMetadata variant to ServerlessRunnerPool wrapping ServerlessMetadataError. (2) engine/packages/api-public/src/runner_configs/utils.rs replaces a generic anyhow! string error with the typed ServerlessRunnerPool::FailedToFetchMetadata error, removes the unused anyhow::anyhow import, and renames result to metadata for clarity. What is good: Replacing an untyped anyhow! string with a structured RivetError variant is the correct pattern per conventions. The unused import is cleaned up. The variable rename improves readability. ServerlessMetadataError already derives Serialize, Deserialize, Clone, and Debug satisfying trait bounds for embedding in a RivetError variant. Minor observation: The new error uses debug formatting {reason:?} in the message template. ServerlessMetadataError does not implement Display so this produces verbose Rust debug output. Not a bug, but if user-facing consider implementing Display for ServerlessMetadataError and switching to {reason}. Asymmetry note: fetch_serverless_runner_metadata maps all ServerlessMetadataError variants to RequestFailed discarding the original variant, while refresh_runner_config_metadata preserves the full structured error. Appears intentional but worth confirming. No convention issues: correct use of derive(RivetError), no rivet.gg domains, no logging violations, no new raw anyhow! macros. No blocking issues found.

[MasterPtato]

Merge activity

• Mar 17, 1:28 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Mar 17, 1:32 AM UTC: Graphite rebased this pull request as part of a merge.
• Mar 17, 1:32 AM UTC: @MasterPtato merged this pull request with Graphite.