Critical-risk tools in Firefly III MCP Server
6 of the 23 tools in Firefly III MCP Server are classified as critical risk. This page profiles those tools specifically, with recommended policy actions and the attack patterns that target them.
Every operation listed below is an action PolicyLayer recommends controlling at the transport layer. Open any tool to see the full profile, risk score, and YAML policy snippet.
Tools at critical risk
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firefly_delete_accountDestructivePermanently delete an account. All linked transactions will also be deleted. This cannot be undone.
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firefly_delete_budgetDestructiveDelete a budget. Transactions linked to this budget will have their budget cleared.
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firefly_delete_categoryDestructiveDelete a category. Transactions using this category will have their category cleared.
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firefly_delete_tagDestructiveDelete a tag. It will be removed from all transactions that use it.
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firefly_delete_transactionDestructivePermanently delete a transaction by its ID. This action cannot be undone.
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firefly_create_transactionFinancialCreate a new transaction in Firefly III. Supports withdrawals (expenses), deposits (income), and transfers between accounts. For a withdrawal: provide source_name (your asset ...
Attacks that target this class
Critical-risk tools in any server share these documented attack patterns. Each links to the full case and the defensive policy.