Create a new transaction in Firefly III. Supports withdrawals (expenses), deposits (income), and transfers between accounts. For a withdrawal: provide source_name (your asset account, e.g.
AI agents use firefly_create_transaction to commit financial operations through Firefly III MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool creates financial transactions including withdrawals, deposits, and transfers — directly committing financial record entries that affect account balances. Even though Firefly III is personal finance tracking software rather than a live banking system, creating transactions represents a financial operation that moves or records money, placing it firmly in the Financial category.
From the tool's definition Create a new transaction in Firefly III. Supports withdrawals (expenses), deposits (income), and transfers between accounts.
Attacks that exploit this kind of access
Create a new transaction in Firefly III. Supports withdrawals (expenses), deposits (income), and transfers between accounts. For a withdrawal: provide source_name (your asset account, e.g. It is categorised as a Financial tool in the Firefly III MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Firefly III MCP Server MCP server in PolicyLayer and add a rule for firefly_create_transaction: 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_create_transaction is a Financial 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_create_transaction 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_create_transaction. 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_create_transaction 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.
Teams ship this data inside their own products. See what a licence covers →