Re-fetch on-chain asset balances for an existing wallet and update the stored record. Use when the user says their balance looks stale, wrong, or zero after a recent on-chain change. Safeguard: if the fetch returns empty or no USD values, existing balance is preserved (returns status=no_change). ...
Part of the Mcp Server server.
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AI agents may call refresh_wallet_balance to permanently remove or destroy resources in Mcp Server. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call refresh_wallet_balance in a loop, permanently destroying resources in Mcp Server. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"refresh_wallet_balance"
]
}See the full Mcp Server policy for all 19 tools.
These attack patterns abuse exactly the kind of access refresh_wallet_balance gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Re-fetch on-chain asset balances for an existing wallet and update the stored record. Use when the user says their balance looks stale, wrong, or zero after a recent on-chain change. Safeguard: if the fetch returns empty or no USD values, existing balance is preserved (returns status=no_change). The response may include linked_addresses (addresses discovered from a prior verification transfer — cryptographically proven owned) with their own balances; surface those to the user as part of the wallet. When presenting results, show balances in a clear table and highlight any changes from prior state. ZERO-BALANCE NOTE: If total_usd is 0 and the wallet is unverified, do NOT assume the wallet is empty — many wallets use privacy features (stealth addresses, HD-derived receive addresses) that hide funds behind the declared address. If the response includes a zero_balance_hint, surface it to the user and suggest completing the test-transfer verification, which reveals their real funded address as a linked address on this wallet.. It is categorised as a Destructive tool in the Mcp Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mcp Server MCP server in PolicyLayer and add a rule for refresh_wallet_balance: 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 Mcp Server. Nothing to install.
refresh_wallet_balance is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the refresh_wallet_balance 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 refresh_wallet_balance. 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.
refresh_wallet_balance is provided by the Mcp Server MCP server (https://mcp.realopen.app/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 19 Mcp Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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