Delete a category. Transactions using this category will have their category cleared.
AI agents call firefly_delete_category to permanently remove resources in Firefly III MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly removes a category from the financial system and severs its associations with existing transactions. While transactions themselves persist, the deletion of the category and removal of category data from related transactions cannot be undone, fitting the Destructive category.
From the tool's definition Tool name explicitly includes 'delete' and description states it will 'Delete a category' and permanently clear category associations from transactions, which are irreversible modifications to financial records.
Attacks that exploit this kind of access
Delete a category. Transactions using this category will have their category cleared. It is categorised as a Destructive tool in the Firefly III MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Firefly III MCP Server MCP server in PolicyLayer and add a rule for firefly_delete_category: 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 Firefly III MCP Server. Nothing to install.
firefly_delete_category is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the firefly_delete_category 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 firefly_delete_category. 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.
firefly_delete_category is provided by the Firefly III MCP Server MCP server (przbadu/firefly-iii-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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