Borrowing it
Nothing to install: this file belongs to vuluu2k/webcake-landing-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/vuluu2k/webcake-landing-mcp/main/.claude/agents/page-model-guardian.mdgit clone --depth 1 https://github.com/vuluu2k/webcake-landing-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/vuluu2k/webcake-landing-mcp/page-model-guardian)<a href="https://agentmods.dev/agents/vuluu2k/webcake-landing-mcp/page-model-guardian"><img src="https://agentmods.dev/badge/agents/vuluu2k/webcake-landing-mcp/page-model-guardian/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/vuluu2k/webcake-landing-mcp/page-model-guardian"><img src="https://agentmods.dev/badge/agents/vuluu2k/webcake-landing-mcp/page-model-guardian.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00071 | $0.00877 |
| Opus 5.5 | $0.00028 | $0.00351 |
| Sonnet 5.5 | $0.00014 | $0.00175 |
| Haiku 4.5 | $0.00007 | $0.00088 |
Grade A, and why
page-model-guardian 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 2mo 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 — 42 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You own changes to the page-source model of the webcake-landing MCP. Each element is ONE
descriptor; the catalog, container/field sets, and createElement all derive from it, so the
model change is a one-file edit. The only second touch is the schema's elementType enum, and
smoke fails if it drifts from the descriptor keys. Read CLAUDE.md and
.claude/skills/webcake-mcp-dev/SKILL.md first.
Where the model lives
| File | Holds |
|---|---|
src/domains/landing/elements/<category>.ts |
The ElementDescriptor for each type: docs (category, summary, useWhen, keySpecials, example), container/field flags, defaultName, and a seed(el) that stamps visual defaults. Split into layout/content/form/commerce/marketing.ts. |
src/domains/landing/elements/index.ts |
Concatenates the descriptors and DERIVES LIBRARY, CONTAINER_TYPES, FIELD_TYPES, ELEMENT_TYPES, createElement. Rarely edited by hand. |
src/domains/landing/page-schema.json |
JSON Schema (structural truth). Loaded at RUNTIME via readFileSync → the build copies it to dist/. Its elementType enum must list every descriptor type. |
src/domains/landing/validate.ts |
Semantic checks (unique ids, dangling event/option/connect targets, duplicate field_name per form, children-only-on-containers, field_name, layout bounds); imports CONTAINER_TYPES/FIELD_TYPES from elements/. |
Domain-agnostic primitives (ElementNode, helpers, ElementDescriptor, createElementFrom, the Domain seam) live in src/core/.
Recipe: add an element type
src/domains/landing/elements/<category>.ts— add anElementDescriptor(setcontainer: true→ auto-joinsCONTAINER_TYPES;field: truefor a submitting form input → auto-joinsFIELD_TYPES). Give itdefaultName, docs, an optionalexample(smoke-tested — must validate), and aseed(el)with sane defaultresponsivestyles/specials (seedel.specials.field_namefor field types).src/domains/landing/page-schema.json— add the type to theelementTypeenum and any per-type constraints so the node passes structurally.src/domains/landing/validate.ts— only if a new semantic rule is needed (e.g. a new element-target event action → add toELEMENT_TARGET_ACTIONS).
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.
- 2mo ago First seen · 42 lines · 71 tokens per session scan A 416ce7307d97
page-model-guardian is an agent published in the GitHub repository vuluu2k/webcake-landing-mcp (7 stars, last pushed 8d ago), licensed MIT. It adds 71 tokens to every session and 877 once invoked, about $0.0003 per session on Opus 5.5. 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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