Convert between units: length, weight, temperature, volume, time, etc. Returns converted value. E.g., "5 m to ft", "100 kg to lbs", "32 degF to degC". Use for unit conversions.
Part of the Mathjs server.
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AI agents use convert_units to create or modify resources in Mathjs. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call convert_units repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Mathjs.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"convert_units": {
"limits": [
{
"counter": "convert_units_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Mathjs policy for all 22 tools.
These attack patterns abuse exactly the kind of access convert_units gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Convert between units: length, weight, temperature, volume, time, etc. Returns converted value. E.g., "5 m to ft", "100 kg to lbs", "32 degF to degC". Use for unit conversions.. It is categorised as a Write tool in the Mathjs MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mathjs MCP server in PolicyLayer and add a rule for convert_units: 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 Mathjs. Nothing to install.
convert_units 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 convert_units 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 convert_units. 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.
convert_units is provided by the Mathjs MCP server (https://gateway.pipeworx.io/mathjs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 Mathjs tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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