AI agents call get_sql_table_schema to retrieve information from Cryo 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 metadata about SQL table structure without modifying or executing code against blockchain data. It supports query construction but has no side effects. While the description is uninformative, the name and context of similar Read-only tools on the server indicate safe data inspection.
From the tool's definition Tool name 'get_sql_table_schema' indicates schema retrieval. The empty description prevents full certainty, but the naming pattern aligns with sibling tools like 'list_available_sql_tables' and 'list_datasets', which are clearly Read operations.
Documented attack patterns abuse exactly the kind of access get_sql_table_schema gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cryo MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_sql_table_schema:
{
"version": "1",
"default": "deny",
"tools": {
"get_sql_table_schema": {}
}
}get_sql_table_schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_sql_table_schema. It is categorised as a Read tool in the Cryo MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Cryo MCP Server MCP server in PolicyLayer and add a rule for get_sql_table_schema: 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 Cryo MCP Server. Nothing to install.
get_sql_table_schema 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 get_sql_table_schema 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 get_sql_table_schema. 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.
get_sql_table_schema is provided by the Cryo MCP Server MCP server (z80dev/cryo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 10 Cryo MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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10 Cryo MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.