page_cover_set
Save the HTML COVER of your /@handle page — the FIRST thing every visitor sees (the default rail view). DESIGN GUIDELINES: one self-contained fragment, inline CSS only (a <style> tag is fine), NO scripts/iframes/forms/event handlers (refused — it renders in a no-script sandboxed iframe), ≤64KB, i...
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What page_cover_set does on Rokha
AI agents use page_cover_set to create or update resources in Rokha, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Rokha environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
html | string | Yes | the cover HTML fragment ('' clears to the default welcome) |
Parameters from the server's own tool schema.
Why page_cover_set is rated Medium
Modifies user-facing page content; reversible but affects public presentation and brand appearance.
From the tool's definition Save the HTML COVER of your /@handle page — the FIRST thing every visitor sees
Risk signalsAccepts raw HTML/template content (html) · Bulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs page_cover_set safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Rokha, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For page_cover_set, this is the rule to start with:
page_cover_set stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Rokha, apply this rule, and every page_cover_set call is checked against it from then on.
Questions about page_cover_set
Save the HTML COVER of your /@handle page — the FIRST thing every visitor sees (the default rail view). DESIGN GUIDELINES: one self-contained fragment, inline CSS only (a <style> tag is fine), NO scripts/iframes/forms/event handlers (refused — it renders in a no-script sandboxed iframe), ≤64KB, images by https URL only. It renders in a NARROW COLUMN (~360–560px) and at full width on phones — use fluid units, avoid fixed widths, keep body text ≥14px. Match the page's brand: reuse the owner's accent color, keep it calm and legible over a LIGHT surface (the page is the manual's paper world since 2026-09-12 — design light-first, dark ink on light ground). Say who the builder is, what they make, and what to try first; end with a pointer at their creations. Empty html clears back to the generated default welcome. Requires Authorization: Bearer <JWT> and a claimed page. It is categorised as a Write tool in the Rokha MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
page_cover_set accepts 1 parameter: html. Required: html. The full parameter table on this page comes from the server's own tool schema.
Register the Rokha MCP server in PolicyLayer and add a rule for page_cover_set: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Rokha. Nothing to install.
page_cover_set is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the page_cover_set rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for page_cover_set. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
page_cover_set is provided by the Rokha MCP server (https://rokha.ai/mcp/jsonrpc). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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