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/binary16labs/prime-silo/frontend-runtimenpx skills add binary16labs/prime-silo --skill frontend-runtimegit clone --depth 1 https://github.com/binary16labs/prime-siloWhat 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 | $0.00022 | $0.01142 |
| Opus 5 | $0.00011 | $0.00571 |
| Sonnet 5 | $0.00004 | $0.00228 |
| Haiku 4.5 | $0.00002 | $0.00114 |
Grade A, and why
Frontend Runtime scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
Do not hardcode third-party CORS proxy services such as allorigins, corsproxy, or codetabs in frontend code or widget renderers. For external HTTP reads, use plain `fetch(externalUrl)` or `space.fetchExternal(externalUrl This is a copy
100% identical to Frontend Runtime — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Use this skill when the task changes browser runtime behavior, framework-backed UI, store orchestration, shared helpers, or general frontend composition under app/.
Editable Scope
- You may edit
app/. - Keep agent logic in the browser when possible.
- Treat
server/as read-only infrastructure from this skill set.
Where First-Party Frontend Code Lives
- Repo-owned first-party frontend code should normally live under
app/L0/_all/mod/_core/.... - New shared browser-runtime helpers belong in
_core/framework/only when multiple modules genuinely need them. - New shared UI primitives belong in
_core/visual/. - Do not place durable repo-owned first-party features directly into
L1orL2.
Framework Boot And Runtime
- Framework-backed pages boot through
/mod/_core/framework/js/initFw.js. - The runtime installs onto
globalThis.space. initFw.jsruns the extensible framework bootstrap step at_core/framework/initializer.js/initializebefore Alpine startup.- Framework bootstrap also creates
_core/framework/head/endindocument.headfor declarative head-side tags or inline bootstraps. - Use
_core/framework/head/endwhen the setup can stay declarative, and use_core/framework/initializer.js/initialize/endwhen the setup must stay imperative instead of editing page shells. - Framework-backed pages centrally handle same-origin
/and/adminopens through normaltarget="_blank"link clicks andwindow.open(..., "_blank")by granting the child window the current tab's/enteraccess marker before navigation; context-menu, middle-click, and modifier-key browser opens stay unmodified and still route through/enter. - Current shared runtime surface includes:
space.apispace.configspace.chatwhen the current agent surface publishes the active thread snapshotspace.fw.createStorespace.utils.markdown.render(text, target)space.utils.markdown.parseDocumentspace.utils.yaml.parseandspace.utils.yaml.stringifyspace.proxyspace.downloadspace.fetchExternal(...)space.browserfor registered browser-surface control; load the top-levelbrowser-controlskill for the detailed method list and browser-frame bridge usage
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 · 77 lines · 22 tokens per session scan A 24b2267b237b
Frontend Runtime is a skill published in the GitHub repository binary16labs/prime-silo (5 stars, last pushed 9d ago), licensed MIT. It adds 22 tokens to every session and 1,142 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to Frontend Runtime, differing in 0 lines, and is treated as a copy.
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draw-image
Generate an image from a text prompt using an OpenAI-compatible image generation API (gpt-image-1-mini or compatible). The image is uploaded to the gofile.io public file sharing service and ONLY the public download page URL is returned. Trigger when user asks to draw, paint, generate, or create an image.
compose:subagent
Use when executing implementation plans with independent tasks in the current session.
compose:worktree
Use when starting feature work that needs isolation from current workspace or before executing implementation plans - ensures an isolated workspace exists via native tools or git worktree fallback.
compose:merge
Use when implementation is complete, all tests pass, and you need to decide how to integrate the work - guides completion of development work by presenting structured options for merge, PR, or cleanup.
compose:new-skill
Use when creating new skills or editing existing skills for the project or personal skill library.
compose:plan
Use when you have a spec or requirements for a multi-step task, before touching code.