Rephrase a given text to sound more formal or fluent.
AI agents use paraphrase_tool to create or update resources in FastMCP Boilerplate — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FastMCP Boilerplate environment.
The tool transforms input text by rephrasing it, which constitutes a modification/creation of content. However, it only produces output text and has no side effects on external systems, databases, or files. Severity is low because misuse is limited to generating rephrased text with no broader impact.
From the tool's definition Rephrase a given text to sound more formal or fluent
Documented attack patterns abuse exactly the kind of access paraphrase_tool gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FastMCP Boilerplate, and nothing reaches the server without passing your rules. This is the rule we recommend for paraphrase_tool:
{
"version": "1",
"default": "deny",
"tools": {
"paraphrase_tool": {
"limits": [
{
"counter": "paraphrase_tool_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}paraphrase_tool 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.
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Rephrase a given text to sound more formal or fluent. It is categorised as a Write tool in the FastMCP Boilerplate MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the FastMCP Boilerplate MCP server in PolicyLayer and add a rule for paraphrase_tool: 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 FastMCP Boilerplate. Nothing to install.
paraphrase_tool 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 paraphrase_tool 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 paraphrase_tool. 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.
paraphrase_tool is provided by the FastMCP Boilerplate MCP server (rainer85ah/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from FastMCP Boilerplate, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
16 FastMCP Boilerplate tools catalogued and risk-classified — across an index of 43,000+ MCP servers.