AI agents call get_financial_year to retrieve information from Fortnox without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves read-only information about financial/accounting years. It does not create, modify, delete, or execute any operations. The 'get_' pattern is consistent with other Read tools on this server (get_accounts, get_company_info, get_customer, get_invoice, get_invoice_payments). Low severity because misuse would only expose accounting period metadata, not cause data modification or financial harm.
From the tool's definition Tool name 'get_' prefix and description 'Get information about' indicate a retrieval operation with no side effects. Returns financial year metadata from the Fortnox accounting platform.
Attacks that exploit this kind of access
Get information about financial/accounting years. It is categorised as a Read tool in the Fortnox MCP Server, which means it retrieves data without modifying state.
Register the Fortnox MCP server in PolicyLayer and add a rule for get_financial_year: 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 Fortnox. Nothing to install.
get_financial_year is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_financial_year 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 get_financial_year. 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.
get_financial_year is provided by the Fortnox MCP server (proviscale/fortnox-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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