Get a single transaction by its ID. Returns full details including all splits.
AI agents call firefly_get_transaction to retrieve information from Firefly III MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries transaction data from Firefly III without modifying, deleting, or creating records. It is a pure read operation that returns existing financial information. While it accesses sensitive financial data (which may lower user privacy), the tool itself poses minimal risk of misuse—fetching a transaction cannot cause direct harm.
From the tool's definition Tool name 'firefly_get_transaction' and description 'Get a single transaction by its ID. Returns full details including all splits.' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get a single transaction by its ID. Returns full details including all splits. It is categorised as a Read tool in the Firefly III MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Firefly III MCP Server MCP server in PolicyLayer and add a rule for firefly_get_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_get_transaction 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 firefly_get_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_get_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_get_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.
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