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 skills add unbounce/agent-plugins --skill mcp-page-authoringgit clone --depth 1 https://github.com/unbounce/agent-pluginsWrote 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/skills/unbounce/agent-plugins/mcp-page-authoring)<a href="https://agentmods.dev/skills/unbounce/agent-plugins/mcp-page-authoring"><img src="https://agentmods.dev/badge/skills/unbounce/agent-plugins/mcp-page-authoring.svg" alt="Measured on agentmods" 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 | $0.00102 | $0.06211 |
| Opus 5 | $0.00051 | $0.03106 |
| Sonnet 5 | $0.00020 | $0.01242 |
| Haiku 4.5 | $0.00010 | $0.00621 |
Grade B, and why
mcp-page-authoring scanned grade B with 2 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.
Subtle steeringmediumPrompt injection
Instructions that bias recommendations or shape behaviour without the user noticing.
- An MCP-authored page **cannot be edited in the Unbounce builder**. Never tell the user they can open, tweak, swap images, or finish the page "in the Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
`upload` and `download` hand you `curl` commands to run locally. If your client How it starts
The opening of the file, as written. The whole thing — 431 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authoring an Unbounce MCP page
These rules apply when you write the HTML/CSS/JS body for create_page_from_html,
create_variant_from_html, or update_variant_from_html. The page is a full-bleed
custom-HTML page — you own the markup end to end. Design the page to be optimized
for conversions: by default, every layout, copy, and hierarchy decision should
serve the page's single conversion goal.
This covers MCP-authored pages only, and the split is exclusive both ways:
- A page hand-built in the Unbounce builder is not editable this way —
update_variant_from_htmlrefuses it. Replicating or modernizing a builder-built page is a different, audit-first job. - An MCP-authored page cannot be edited in the Unbounce builder. Never tell the user they can open, tweak, swap images, or finish the page "in the Unbounce builder/editor" — they cannot. Every edit goes through these MCP tools: the user asks for the change, or supplies updated HTML.
Updating a variant: HTML/CSS replace, JS is left alone
update_variant_from_html full-replaces the body HTML and the stylesheet, so
send every stylesheet the variant should keep on every call. JavaScript is the
exception: omit scripts and the variant's existing custom-JavaScript elements
are kept, reported back as scripts_preserved.
That matters because a variant can carry scripts nobody authored through these tools — an Unbounce popup attaches itself as one. So:
- Editing HTML or CSS? Just omit
scripts. The popup and anything like it survive, and you don't need to know they were there. - Changing the scripts? Pass
scriptswith the complete desired set — it replaces all of them, including external includes. Whatever it drops comes back inremoved_scripts. Those entries — and thescripts_preservedones — are already inscriptsentry form: pass one straight back to restore it, unchanged, no translation. A plain include appears assrc(withasync/deferif it had them); everything else — including an include whose tag carries other attributes, such as adata-*-configured analytics embed — comes back as verbatimtag. Read the variant first (get_variant) if you don't know what's there. - Removing every script is deliberate: pass
scripts: [].
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 Changed · +2 lines 6644e59484c1
- 7d ago First seen · 429 lines · 102 tokens per session scan B 07edc0a7e29d
mcp-page-authoring is a skill published in the GitHub repository unbounce/agent-plugins (1 stars, last pushed 4d ago), licensed MIT. It adds 102 tokens to every session and 6,211 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 2 findings (subtle steering, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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