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/ibuilder/massing/verify-frontendnpx skills add ibuilder/massing --skill verify-frontendgit clone --depth 1 https://github.com/ibuilder/massingWhat 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 | $0.00073 | $0.00999 |
| Opus 5 | $0.00036 | $0.00500 |
| Sonnet 5 | $0.00015 | $0.00200 |
| Haiku 4.5 | $0.00007 | $0.00100 |
Grade A, and why
verify-frontend 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 3d 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 — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Verify a Massing frontend change
Standing directions for this repo: docs/roadmap-directions.md. Read those first.
The "preview stall" was diagnosed and FIXED in v0.3.703 — it was never the geometry loader. Five
SSE endpoints polled the database inside async def gen(), blocking the event loop for every other
client; two open tabs left the server wedged and every request timed out, including the app's boot
api.health(). That left projectId unset, so the portal showed "No project open" while a model sat
rendered on screen. Fixed with run_in_threadpool; measured >8s timeouts → ~20 ms. Full live
verification now works — start both servers and drive the real app.
A SECOND "stall" was diagnosed and fixed 2026-08-02, and it was not the loader either — the canvas
had width ZERO. Container 830x572, canvas 0x493, four meshes and 230 triangles built and visible,
.frag 200, worker fine, console clean. The renderer sizes itself once at construction; if the
container is not at final width yet, that first size sticks for ever. A ResizeObserver in
createViewer now tracks it (apps/web/src/viewer/canvasResize.test.ts).
Twice now, "the geometry loader stalls" has meant something else entirely — once a blocked event loop, once a zero-width canvas. Before writing that sentence a third time, ask the page:
const c = document.querySelector('canvas'), k = document.querySelector('#container');
({ canvas: c.width+'x'+c.height, container: k.clientWidth+'x'+k.clientHeight }) // canvas ≈ container × devicePixelRatio
and count what is actually in the scene (v.viewer.world._scene.three, not v.world). A caveat
nobody re-tests becomes folklore: this skill asserted the stall in its own frontmatter for weeks
while its body said it was fixed, and the contradiction propagated into eight changelog entries.
Always
cd apps/web && export PATH="/c/Program Files/nodejs:$PATH"
npm run typecheck && npm run lint # Node 24 (Node 18 breaks the build)
npx vitest run <path/if/covered>
npm run build # strongest compile check; ~1 min
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.
- 3d ago First seen · 63 lines · 73 tokens per session scan A e7d9ce184084
verify-frontend is a skill published in the GitHub repository ibuilder/massing (132 stars, last pushed 3d ago), licensed MIT. It adds 73 tokens to every session and 999 once invoked, about $0.0004 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 2026-08-30.
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