Is UserPromptSubmit safe to install?

Yes — UserPromptSubmit is safe to install, on this review. Fable 5.1 read every file UserPromptSubmit ships from aaif-goose/goose on 7 September 2026 and found nothing that acts against the person installing it; the static scan of its 26 rules grades it A.

Reviewed by Fable 5.1 on 7 September 2026 · a grade is what a scan and a reading found, not a guarantee · how this works

What the reviewer found

UserPromptSubmit in Goose's example hello-hooks plugin runs examples/plugins/hello-hooks/scripts/announce.sh, which appends every prompt payload, prompt text included, to last-event.log inside the plugin directory and echoes a one-line marker to stderr. The log stays on disk in the plugin folder and nothing is sent anywhere; this is an examples/ demo, but installers should know their prompts are written to that file.

What was read

The hook definition and the script it runs, fetched from aaif-goose/goose:

What the static scan said

The 26-rule scan found nothing in this file; the review read it anyway.

How this review was made

Fable 5.1 read the files above on 7 September 2026 and answered three questions: is it dangerous to whoever installs it, is each scanner finding real, and what should the installer know. The verdict is bound to the file's hash; when the file changes, it is scanned afresh and reviewed again. A script that changes while the definition does not is not re-reviewed — that is a known gap. How the scan and the review work.

Produced by agentmods.dev · Fable 5.1 · 7 September 2026

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