Automatic plugin installation does not work in version 4.0.0

[florianmutter]

Bug description

When running we get the following output:

$ npx @datadog/datadog-ci synthetics run-tests
Could not find @datadog/datadog-ci-plugin-synthetics. Installing...

┏━ [Installed plugin 🔌]
┃ Successfully installed @datadog/datadog-ci-plugin-synthetics@4.0.0
┗━


┏━ [Plugin not installed 🔌]
┃ The datadog-ci synthetics run-tests command could not be found.
┃ To use this command, please install @datadog/datadog-ci-plugin-synthetics alongside datadog-ci.
┗━

You can install the plugin using:
  datadog-ci plugin install synthetics
or
  datadog-ci plugin install @datadog/datadog-ci-plugin-synthetics

To troubleshoot, run:
  datadog-ci plugin check synthetics
or
  datadog-ci plugin check synthetics run-tests

Next run does not fail anymore

Describe what you expected

We expect the command to work on the first try.

Steps to reproduce the issue

Run npx @datadog/datadog-ci synthetics run-tests

Additional context

• macOS 26
• node v20.19.5
• npx v10.8.2

Command

synthetics

[Drarig29]

Hi @florianmutter! Please pin the last major version while we find a fix for the npx @datadog/datadog-ci synthetics run-tests use case. See message below.

[Drarig29]

We are going to reintroduce the synthetics plugin as a built-in plugin.

[florianmutter]

Maybe this was an issue only on our side? I struggle a little bit to reproduce it. We saw it in our pipeline and it happened locally once.

[florianmutter]

Ah now I see it again in the pipeline. Will update this comment with details

[Drarig29]

@florianmutter @GurayCetin @ihorkokotskyi This should be fixed now! Sorry for the inconvenience.

[tgentry300]

Good morning. Just wanted to add, we ran into this issue with the datadog-ci-plugin-lambda today. We're always installing latest datadog-ci in our workflow. Installing the plugin alongside the datadog-ci fixed this problem.

[Drarig29]

Hi @tgentry300! Were you using npx? If not, what package manager are you using?

[tgentry300]

Hello @Drarig29! We're just using npm.

[Drarig29]

Can you send the logs you encountered?