Fetch esa limited sample of rows (default 5) from a specified table...
AI agents call preview_table_data to retrieve information from Advanced Hasura GraphQL 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 and queries data with built-in safety constraints (limited sample of 5 rows), producing no side effects. It falls squarely under the Read category. While the server enables mutations via sibling tools (run_graphql_mutation, run_graphql_query), this specific tool is limited to non-destructive data preview. Severity is low due to the sampling limitation and read-only nature.
From the tool's definition Tool name 'preview_table_data' and description 'Fetch a limited sample of rows (default 5) from a specified table' indicate data retrieval with no modification, deletion, or execution capabilities.
Attacks that exploit this kind of access
Fetch esa limited sample of rows (default 5) from a specified table. It is categorised as a Read tool in the Advanced Hasura GraphQL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Advanced Hasura GraphQL MCP Server MCP server in PolicyLayer and add a rule for preview_table_data: 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 Advanced Hasura GraphQL MCP Server. Nothing to install.
preview_table_data 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 preview_table_data 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 preview_table_data. 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.
preview_table_data is provided by the Advanced Hasura GraphQL MCP Server MCP server (vikasversetest-debug/hasura_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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