Suggest Portuguese tax categories for uncategorised Xero expenses. Returns category, VAT tier, deductibility, and VAT breakdown per transaction.
Part of the Accounting Mcp server.
Free to start. No card required.
AI agents use categorise_expenses to create or modify resources in Accounting Mcp. 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 categorise_expenses 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 Accounting Mcp.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"categorise_expenses": {
"limits": [
{
"counter": "categorise_expenses_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Accounting Mcp policy for all 9 tools.
These attack patterns abuse exactly the kind of access categorise_expenses 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.
Suggest Portuguese tax categories for uncategorised Xero expenses. Returns category, VAT tier, deductibility, and VAT breakdown per transaction.. It is categorised as a Write tool in the Accounting Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Accounting MCP server in PolicyLayer and add a rule for categorise_expenses: 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 Accounting Mcp. Nothing to install.
categorise_expenses 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 categorise_expenses 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 categorise_expenses. 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.
categorise_expenses is provided by the Accounting MCP server (https://xero.api.ainode.tech/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 Accounting Mcp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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