Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/fullstack-phoenix/saas_kit/locale-pickernpx skills add fullstack-phoenix/saas_kit --skill locale-pickergit clone --depth 1 https://github.com/fullstack-phoenix/saas_kitWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00040 | $0.01071 |
| Opus 5 | $0.00020 | $0.00535 |
| Sonnet 5 | $0.00008 | $0.00214 |
| Haiku 4.5 | $0.00004 | $0.00107 |
Grade A, and why
locale-picker scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Locale Picker
Adds a runtime language switcher. Generates a MyAppWeb.Locale plug + LiveView
on_mount hook that resolves the active locale (query param → cookie/session →
current user → default), a LocalePickerLive dropdown rendered through a portal,
and a JS hook to redirect on selection. Locale choice persists in a cookie and
flows into Gettext for every request and LiveView.
When to use
- The app ships UI in more than one language and users should pick their own.
- You already use (or are willing to use) Gettext for translations.
- Don't reach for this for a single-language app, or when locale is fixed per
tenant and never user-selectable — a static
Gettext.put_locale/2is enough.
Dependencies
- Requires: None.
- Recommended: None. The
layoutsboilerplate option lets the installer drop the picker into the generatedapp,public, andsessionlayouts automatically.
Install
mix saaskit.feature.install locale_picker
No interactive decisions. Layout injection (instructions g–i) only runs when
the boilerplate was generated with the layouts option; otherwise mount the
picker target yourself (see Tweaking). The install also runs mix gettext.extract.
What it generates
lib/my_app_web/locale.ex— theMyAppWeb.Localemodule:set_locale/2plug,on_mount(:set_locale, ...), plusknown_locales/0andcurrent_locale/0.lib/my_app_web/live/locale_picker_live.ex—LocalePickerLive, the dropdown rendered via<.portal target="#locale-target">.assets/js/hooks/locale_picker.js—LocalePickerhook (registered inassets/js/hooks/index.js) that reports the current URL and handles redirects.test/my_app_web/live/locale_picker_live_test.exs— LiveView tests.- Router wiring: imports
set_locale/2, addsplug :set_localeto the browser pipeline, and prepends{MyAppWeb.Locale, :set_locale}to the LiveViewon_mountlist. - Mounts
live_render(@conn, MyAppWeb.LocalePickerLive, ...)at the end ofroot.html.heexand adds<div id="locale-target">to the layouts.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 108 lines · 40 tokens per session scan A c41d0d767988
locale-picker is a skill published in the GitHub repository fullstack-phoenix/saas_kit (2 stars, last pushed 2mo ago), licensed MIT. It adds 40 tokens to every session and 1,071 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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