AI agents use create_and_save_chart to create or update resources in Math MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Math MCP Server environment.
Creating and saving charts is a reversible write operation that persists new data (visualizations) to the filesystem. It does not execute arbitrary code, destroy data, or involve financial transactions. The empty description is a limitation, but the semantic content of 'create_and_save' clearly indicates write category.
From the tool's definition Tool name 'create_and_save_chart' indicates it creates and saves data (chart files) to persistent storage. The empty description reduces confidence but the name strongly suggests a write/create operation.
Documented attack patterns abuse exactly the kind of access create_and_save_chart gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Math MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_and_save_chart:
{
"version": "1",
"default": "deny",
"tools": {
"create_and_save_chart": {
"limits": [
{
"counter": "create_and_save_chart_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_and_save_chart 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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create_and_save_chart. It is categorised as a Write tool in the Math MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Math MCP Server MCP server in PolicyLayer and add a rule for create_and_save_chart: 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 Math MCP Server. Nothing to install.
create_and_save_chart 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 create_and_save_chart 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 create_and_save_chart. 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.
create_and_save_chart is provided by the Math MCP Server MCP server (111-test-111/math-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Math MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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22 Math MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.