Lists all shares (users/groups with access) for a sheet
AI agents call list_sheet_shares to retrieve information from Smartsheet 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 sharing permission information for a sheet. It performs a read-only query that does not create, modify, delete, or execute any operations. The information retrieved (list of users/groups with access) could be sensitive, but the tool itself only observes existing state without changing anything.
From the tool's definition Tool name 'list_sheet_shares' and description 'Lists all shares (users/groups with access) for a sheet' indicates a query/retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Lists all shares (users/groups with access) for a sheet. It is categorised as a Read tool in the Smartsheet MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Smartsheet MCP Server MCP server in PolicyLayer and add a rule for list_sheet_shares: 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 Smartsheet MCP Server. Nothing to install.
list_sheet_shares 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 list_sheet_shares 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 list_sheet_shares. 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.
list_sheet_shares is provided by the Smartsheet MCP Server MCP server (thomaswtwrt/smar-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.
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