gleam-lang/gleam

Error message when reverting version that doesn't exist could be improved

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#5,709 opened on May 13, 2026

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good first issuehelp wanted

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Description

When trying to revert a version that doesn't exist we get the following error message:

> gleam hex revert --package birdie --version 1.234234.2
error: Hex API failure

There was a problem when using the Hex API.

This was error from the Hex client library:

    Resource was not found

I think a much better error would look something like this:

> gleam hex revert --package birdie --version 1.234234.2

error: Hex API failure

There is no version 1.234234.2 of the package birdie.

Contributor guide

Research direction
Locate the `revert` command handler in the Hex API client code, where the error for non existent version is generated. Modify the error message to indicate the specific version and package name.
Tech stack
rust
Domain
clideveloper experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
85