[FacturaHub] Add a sale (or other movement) to the open cash register. For sales, you can include line items with product details. Consumer-final sales are grouped into a single invoice when the register is closed.
AI agents use add_movement to create or update resources in FacturaHub MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FacturaHub MCP Server environment.
The tool creates or modifies financial data (sales records, movements, line items) in the POS system. This is a Write operation because it creates new entries that are reversible (movements can be adjusted or voided). It is not Destructive since additions to a register are not deletions. It is not Financial because it records sales rather than moving actual money/payments.
From the tool's definition Tool description states it 'Add[s] a sale (or other movement) to the open cash register' and 'line items with product details' are included. This creates new financial records (sales/movements) that modify the cash register state.
Attacks that exploit this kind of access
[FacturaHub] Add a sale (or other movement) to the open cash register. For sales, you can include line items with product details. Consumer-final sales are grouped into a single invoice when the register is closed. It is categorised as a Write tool in the FacturaHub MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the FacturaHub MCP Server MCP server in PolicyLayer and add a rule for add_movement: 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 FacturaHub MCP Server. Nothing to install.
add_movement is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the add_movement 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 add_movement. 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.
add_movement is provided by the FacturaHub MCP Server MCP server (santy1422/facturahub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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