Used to look up minimum balance required for rent exemption by data size
AI agents call getMinimumBalanceForRentExemption to retrieve information from Solana Model Context Protocol (MCP) Demo without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a lookup operation with no side effects—it queries and returns a value based on an input parameter (data size) without modifying, executing, or deleting any data. It is a read-only RPC method typical of blockchain information retrieval. Severity is low because misuse would only return incorrect informational data, with no financial, destructive, or execution risk.
From the tool's definition Tool name 'getMinimumBalanceForRentExemption' and description 'look up minimum balance required for rent exemption by data size' indicate a read-only query operation that retrieves informational data about Solana protocol parameters.
Documented attack patterns abuse exactly the kind of access getMinimumBalanceForRentExemption gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Solana Model Context Protocol (MCP) Demo, and nothing reaches the server without passing your rules. This is the rule we recommend for getMinimumBalanceForRentExemption:
{
"version": "1",
"default": "deny",
"tools": {
"getMinimumBalanceForRentExemption": {}
}
}getMinimumBalanceForRentExemption is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Used to look up minimum balance required for rent exemption by data size. It is categorised as a Read tool in the Solana Model Context Protocol (MCP) Demo MCP Server, which means it retrieves data without modifying state.
Register the Solana Model Context Protocol (MCP) Demo MCP server in PolicyLayer and add a rule for getMinimumBalanceForRentExemption: 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 Solana Model Context Protocol (MCP) Demo. Nothing to install.
getMinimumBalanceForRentExemption 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 getMinimumBalanceForRentExemption 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 getMinimumBalanceForRentExemption. 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.
getMinimumBalanceForRentExemption is provided by the Solana Model Context Protocol (MCP) Demo MCP server (solana-foundation/solana-dev-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Solana Model Context Protocol (MCP) Demo tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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4 Solana Model Context Protocol (MCP) Demo tools catalogued and risk-classified — across an index of 42,500+ MCP servers.