sap_modify_cell

THE RISK

Medium Risk

Why sap_modify_cell needs a policy

This tool creates or modifies data within SAP systems. Depending on context, modified cells could represent business-critical data (financial records, inventory, customer information, etc.). The high severity reflects the potential for widespread business impact if an AI agent modifies incorrect cells or values in production SAP systems.

From the tool's definition Tool name 'sap_modify_cell' and description 'Modify the value of a cell in an ALV grid or table control' explicitly indicate data modification. The action modifies existing values in SAP tables/grids, which is a reversible write operation.

Documented attack patterns abuse exactly the kind of access sap_modify_cell gives an agent:

POLICY

How to control sap_modify_cell

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP SAP GUI Server, and nothing reaches the server without passing your rules. This is the rule we recommend for sap_modify_cell:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sap_modify_cell": {
      "limits": [
        {
          "counter": "sap_modify_cell_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

sap_modify_cell stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register MCP SAP GUI Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP SAP GUI Server tools

Execute sap_execute_transaction sap_execute_transaction Execute sap_click_tree_link Click a hyperlink in a tree node item. Execute sap_collapse_tree_node Collapse a folder node in a tree control Execute sap_connect sap_connect Execute sap_connect_existing Connect to an already open SAP session. Use this when SAP is already logged in. Execute sap_disconnect Disconnect from the current SAP session and release the binding. Execute sap_double_click_cell Double-click a cell in a table/grid (often opens details or drills down). Execute sap_double_click_tree_item Double-click a specific item (column cell) in a tree node row.

All 57 MCP SAP GUI Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about sap_modify_cell

What does the sap_modify_cell tool do? +

Modify the value of a cell in an ALV grid or table control. It is categorised as a Write tool in the MCP SAP GUI Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sap_modify_cell? +

Register the MCP SAP GUI Server MCP server in PolicyLayer and add a rule for sap_modify_cell: 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 MCP SAP GUI Server. Nothing to install.

What risk level is sap_modify_cell? +

sap_modify_cell is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit sap_modify_cell? +

Yes. Add a rate_limit block to the sap_modify_cell 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.

How do I block sap_modify_cell completely? +

Set action: deny in the PolicyLayer policy for sap_modify_cell. 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.

What MCP server provides sap_modify_cell? +

sap_modify_cell is provided by the MCP SAP GUI Server MCP server (kts982/mcp-sap-gui). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP SAP GUI Server tool call.

Start from MCP SAP GUI Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →