AI agents call extract-images to retrieve information from Pdf without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves image content from PDF documents without creating, modifying, deleting, or executing any operations. It is purely a read operation that extracts and returns image data from existing PDF files, posing minimal security risk as the action is non-destructive and produces no side effects beyond data retrieval.
From the tool's definition Tool name 'extract-images' and description '从PDF文件中提取图片' (extract images from PDF files) indicate data retrieval with no modification, deletion, or execution capabilities.
Documented attack patterns abuse exactly the kind of access extract-images gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Pdf, and nothing reaches the server without passing your rules. This is the rule we recommend for extract-images:
{
"version": "1",
"default": "deny",
"tools": {
"extract-images": {}
}
}extract-images is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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从PDF文件中提取图片. It is categorised as a Read tool in the Pdf MCP Server, which means it retrieves data without modifying state.
Register the Pdf MCP server in PolicyLayer and add a rule for extract-images: 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 Pdf. Nothing to install.
extract-images 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 extract-images 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 extract-images. 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.
extract-images is provided by the Pdf MCP server (saury1120/pdf-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 9 Pdf tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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9 Pdf tools catalogued and risk-classified — across an index of 42,500+ MCP servers.