Simulate a transaction on a forked chain WITHOUT actually executing it. Detects reverts, abnormal gas usage, and other red flags. Use this to preview what will happen before sending a real transaction.
AI agents call simulate_transaction to retrieve information from Aegis Defi without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool explicitly states it does NOT actually execute transactions — it only simulates on a forked chain. This is a read/preview operation with no real-world side effects. It retrieves simulation results (reverts, gas usage, red flags) without modifying any on-chain state or moving funds. Misuse risk is low since no real transaction is sent.
From the tool's definition Simulate a transaction on a forked chain WITHOUT actually executing it. Detects reverts, abnormal gas usage, and other red flags. Use this to preview what will happen before sending a real transaction.
Attacks that exploit this kind of access
Simulate a transaction on a forked chain WITHOUT actually executing it. Detects reverts, abnormal gas usage, and other red flags. Use this to preview what will happen before sending a real transaction. It is categorised as a Read tool in the Aegis Defi MCP Server, which means it retrieves data without modifying state.
Register the Aegis Defi MCP server in PolicyLayer and add a rule for simulate_transaction: 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 Aegis Defi. Nothing to install.
simulate_transaction 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 simulate_transaction 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 simulate_transaction. 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.
simulate_transaction is provided by the Aegis Defi MCP server (stanleythegoat/aegis). 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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