[alongubkin]

Fixes ALIEN-1122.

Problem

When a deployment fails, alien deployments get and deploy failure output showed only the summary:

Deployment failed: 1 resource error(s), 4 interrupted, 10 total

The failed resources and their errors are in the DEPLOYMENT_FAILED error's context.resource_errors, which render_human_error never read. Finding out which resource failed, and why, meant fetching the deployment as JSON and walking the nested errors. alien dev already had this logic (deployment_error_message / root_cause_message), but only for its own status card.

Fix

• render_human_error finds a DEPLOYMENT_FAILED error in the chain and adds a Failed resources: section with one resource: root cause line per failed resource. The root cause is the deepest non-internal message in that resource's error chain.
• alien deploy and alien destroy returned a new phase-level DEPLOYMENT_FAILED ("provisioning failed") with no details. They now attach the final deployment state's headline error, which lists the failed resources, as its source.
• The resource/root-cause extraction moved from lib.rs into ui.rs, and alien dev uses the same function, so there's one copy.

Tests

• New render_human_error_names_each_failed_resource: a real alien_deployment DeploymentFailed error with two failed resources, serialized and read back the way deployments get reads the stored error, renders both resources with their root cause, both as stored and wrapped the way alien deploy returns it.
• cargo test -p alien-cli --lib passes (341 tests).

🤖 Generated with Claude Code

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Improves error messages for deployment and deletion failures.

No distinct new blocking issue was found, but the previously reported deploy failure-output problem remains in the code.

Summary

The PR adds per-resource causes to human-readable deployment errors and shares the extraction logic with alien dev.

• The follow-up attempts to attach the final deployment-state error to deploy and destroy failures.
• A test covers rendering a stored failure and a wrapped failure.

_{Reviews (2) · Last reviewed commit: "fix: carry failed resources into deploy ..."}

[alongubkin]

@greptileai