List all tags. Tags are flexible labels you can attach to transactions.
AI agents call firefly_list_tags 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 only retrieves and displays a list of tags from the financial system. It performs no write, delete, or execute operations. Even in the context of a financial management system, listing tags poses minimal risk—it merely exposes metadata about categorization labels without moving money, modifying records, or executing arbitrary operations.
From the tool's definition Tool name 'firefly_list_tags' and description 'List all tags' explicitly indicate a retrieval operation with no modification. The verb 'list' is a classic read-only query that returns existing data without side effects.
Attacks that exploit this kind of access
List all tags. Tags are flexible labels you can attach to transactions. 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_list_tags: 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_list_tags 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_list_tags 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_list_tags. 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_list_tags 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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