Get DIAN rejection errors for an invoice that failed electronic stamping
AI agents call siigo_get_invoice_stamp_errors to retrieve information from Siigo 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 error information about a previously failed invoice stamping process. It performs a read-only query against stored data and does not modify, execute, delete, or affect any financial transactions. The retrieved errors are informational and help diagnose why an invoice failed validation, but retrieving this information carries no risk of unintended data changes or operational impact.
From the tool's definition Tool name contains 'get_' and description states 'Get DIAN rejection errors' — both indicate data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Get DIAN rejection errors for an invoice that failed electronic stamping. It is categorised as a Read tool in the Siigo MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Siigo MCP Server MCP server in PolicyLayer and add a rule for siigo_get_invoice_stamp_errors: 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 Siigo MCP Server. Nothing to install.
siigo_get_invoice_stamp_errors 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 siigo_get_invoice_stamp_errors 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 siigo_get_invoice_stamp_errors. 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.
siigo_get_invoice_stamp_errors is provided by the Siigo MCP Server MCP server (jdlar1/siigo-mcp). 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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