Wait until UGF sponsorship side is ready for a destination EVM tx. Agent then sends destination tx itself.
AI agents invoke ugf_evm_wait_sponsorship to trigger actions in Universal Gas Framework MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This is Execute rather than Financial because it is a transaction execution mechanism (not a direct payment/fund transfer), but at critical severity due to ability to trigger irreversible blockchain transactions across chains that could result in substantial financial loss or unintended smart contract interactions.
From the tool's definition Tool enables execution of EVM transactions on destination chains via cross-chain mechanism ('Wait until UGF sponsorship side is ready for a destination EVM tx. Agent then sends destination tx itself').
Attacks that exploit this kind of access
Wait until UGF sponsorship side is ready for a destination EVM tx. Agent then sends destination tx itself. It is categorised as a Execute tool in the Universal Gas Framework MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Universal Gas Framework MCP Server MCP server in PolicyLayer and add a rule for ugf_evm_wait_sponsorship: 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 Universal Gas Framework MCP Server. Nothing to install.
ugf_evm_wait_sponsorship is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the ugf_evm_wait_sponsorship 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 ugf_evm_wait_sponsorship. 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.
ugf_evm_wait_sponsorship is provided by the Universal Gas Framework MCP Server MCP server (tychiwallet/ugf-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.
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