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Part of the Dyer Md server.
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AI agents call render_html to retrieve information from Dyer Md without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though render_html only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"render_html": {}
}
}See the full Dyer Md policy for all 12 tools.
These attack patterns abuse exactly the kind of access render_html gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Convert a note's Markdown to HTML. Useful for previewing or publishing.. It is categorised as a Read tool in the Dyer Md MCP Server, which means it retrieves data without modifying state.
Register the Dyer Md MCP server in PolicyLayer and add a rule for render_html: 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 Dyer Md. Nothing to install.
render_html is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the render_html 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 render_html. 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.
render_html is provided by the Dyer Md MCP server (dyer-md-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 12 Dyer Md tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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