Convert between currencies using live exchange rates (150+ currencies). Powered by ExchangeRate API with static fallback. Useful for trip budgeting in local currency.
Part of the Pulse server.
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AI agents use convert_currency to create or modify resources in Pulse. 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_currency 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 Pulse.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"convert_currency": {
"limits": [
{
"counter": "convert_currency_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Pulse policy for all 29 tools.
These attack patterns abuse exactly the kind of access convert_currency 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 currencies using live exchange rates (150+ currencies). Powered by ExchangeRate API with static fallback. Useful for trip budgeting in local currency.. It is categorised as a Write tool in the Pulse MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Pulse MCP server in PolicyLayer and add a rule for convert_currency: 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 Pulse. Nothing to install.
convert_currency 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_currency 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_currency. 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_currency is provided by the Pulse MCP server (onetrip/pulse). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Pulse tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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