Estimate network and system fees for a contract invocation by script hash or a generic contract reference
AI agents call estimate_invoke_fees to retrieve information from Neo N3 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool only estimates fees for a contract invocation without actually executing it or committing any transaction. It is a read/query operation that retrieves fee information from the blockchain, producing no side effects.
From the tool's definition Estimate network and system fees for a contract invocation
Attacks that exploit this kind of access
Estimate network and system fees for a contract invocation by script hash or a generic contract reference. It is categorised as a Read tool in the Neo N3 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Neo N3 MCP Server MCP server in PolicyLayer and add a rule for estimate_invoke_fees: 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 Neo N3 MCP Server. Nothing to install.
estimate_invoke_fees 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 estimate_invoke_fees 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 estimate_invoke_fees. 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.
estimate_invoke_fees is provided by the Neo N3 MCP Server MCP server (r3e-network/neo-n3-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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