evidence_storno
Cancel (storno) a document record in any AbraFlexi evidence.
This record as markdown: /tools/abraflexi/evidence-storno.md
What evidence_storno does on AbraFlexi
AI agents call evidence_storno to permanently remove resources in AbraFlexi, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why evidence_storno is rated Critical
Canceling/reversing document records is irreversible accounting operation that affects historical records and financial data integrity. While not a hard delete, a storno is a permanent accounting reversal that cannot be undone—it creates an offsetting entry.
From the tool's definition Tool name 'evidence_storno' and description 'Cancel (storno) a document record in any AbraFlexi evidence.' The term 'storno' in accounting means to reverse or cancel a transaction, which modifies or nullifies existing records.
Attacks that exploit this kind of access
The rule that runs evidence_storno safely
PolicyLayer is an MCP gateway: it sits between your AI agents and AbraFlexi, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For evidence_storno, this is the rule to start with:
evidence_storno is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect AbraFlexi, apply this rule, and every evidence_storno call is checked against it from then on.
Questions about evidence_storno
Cancel (storno) a document record in any AbraFlexi evidence. It is categorised as a Destructive tool in the AbraFlexi MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the AbraFlexi MCP server in PolicyLayer and add a rule for evidence_storno: 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 AbraFlexi. Nothing to install.
evidence_storno is a Destructive 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 evidence_storno 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 evidence_storno. 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.
evidence_storno is provided by the AbraFlexi MCP server (abraflexi-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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