Add new rows/fields to an existing table (additions only). Payload by type: Datatype→fields, SimpleRules/SmartRules→rules, SimpleSpreadsheet→steps, Spreadsheet→rows+cells, Vocabulary→values, RawSource→rows. For RawSource, each row must cover ALL columns of the table (one cell object per column; r...
AI agents use append_table to create or update resources in Openl — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Openl environment.
The tool creates and appends new data to existing tables within the OpenL Studio Rules Management System. It explicitly performs reversible additions (rows and fields) without deletion or destruction. This is a data modification operation that can be undone or corrected, placing it in the Write category.
From the tool's definition Add new rows/fields to an existing table (additions only). Payload by type: Datatype→fields, SimpleRules/SmartRules→rules, SimpleSpreadsheet→steps, Spreadsheet→rows+cells, Vocabulary→values, RawSource→rows.
Attacks that exploit this kind of access
Add new rows/fields to an existing table (additions only). Payload by type: Datatype→fields, SimpleRules/SmartRules→rules, SimpleSpreadsheet→steps, Spreadsheet→rows+cells, Vocabulary→values, RawSource→rows. For RawSource, each row must cover ALL columns of the table (one cell object per column; rows with a wrong cell count are rejected before anything is written). For modifying, deleting, or reordering use update_table instead. IMPORTANT: an edit that relocates the table (it had no room to grow in place) CHANGES its location-derived id; the response always returns the table. It is categorised as a Write tool in the Openl MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Openl MCP server in PolicyLayer and add a rule for append_table: 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 Openl. Nothing to install.
append_table 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 append_table 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 append_table. 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.
append_table is provided by the Openl MCP server (openl-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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