AI agents call calculate-similarity 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 and analyzes content from PDFs to produce a similarity metric. It has no side effects—it does not modify, delete, or execute code. It fits the Read category as it queries/analyzes document data without irreversible or code-execution consequences. Severity is low because misuse would only expose analysis results, not enable data destruction, financial impact, or arbitrary code execution.
From the tool's definition calculate-similarity computes similarity between two PDF documents; the description '计算两个PDF文档的相似度' (calculate the similarity of two PDF documents) indicates a read-only analytical operation with no modification, deletion, or execution of external code.
Documented attack patterns abuse exactly the kind of access calculate-similarity 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 calculate-similarity:
{
"version": "1",
"default": "deny",
"tools": {
"calculate-similarity": {}
}
}calculate-similarity is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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计算两个PDF文档的相似度. 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 calculate-similarity: 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.
calculate-similarity 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 calculate-similarity 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 calculate-similarity. 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.
calculate-similarity 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.
Free to start. No card required.
9 Pdf tools catalogued and risk-classified — across an index of 42,500+ MCP servers.