Calculate the minimum SOL balance needed to keep an account rent-exempt
AI agents call get_minimum_balance_for_rent to retrieve information from Solana 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 or computes information about Solana's rent exemption requirements without modifying state, executing code, or moving funds. It is a pure read operation used for informational purposes, similar to get_balance and get_account_info on the same server.
From the tool's definition Tool name 'get_minimum_balance_for_rent' and description 'Calculate the minimum SOL balance needed to keep an account rent-exempt' indicate a query/calculation operation with no side effects.
Attacks that exploit this kind of access
Calculate the minimum SOL balance needed to keep an account rent-exempt. It is categorised as a Read tool in the Solana MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Solana MCP Server MCP server in PolicyLayer and add a rule for get_minimum_balance_for_rent: 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 MCP Server. Nothing to install.
get_minimum_balance_for_rent 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_minimum_balance_for_rent 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_minimum_balance_for_rent. 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_minimum_balance_for_rent is provided by the Solana MCP Server MCP server (visioneth/solana-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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