Wait for UGF to prepare Sui sponsor tx_bytes + sponsor_sig (base64). Agent signs tx_bytes locally with its Sui Ed25519 keypair, then calls ugf_sui_execute_signed_block.
AI agents invoke ugf_sui_wait_sponsor_bytes 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 tool enables execution of cross-chain transactions on the Sui blockchain. Although the private key is not exposed to UGF (per server description), the tool orchestrates the signing and execution flow of financial transactions.
From the tool's definition Tool description states agent 'signs tx_bytes locally' and then 'calls ugf_sui_execute_signed_block', indicating it triggers execution of blockchain transactions.
Attacks that exploit this kind of access
Wait for UGF to prepare Sui sponsor tx_bytes + sponsor_sig (base64). Agent signs tx_bytes locally with its Sui Ed25519 keypair, then calls ugf_sui_execute_signed_block. 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_sui_wait_sponsor_bytes: 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_sui_wait_sponsor_bytes 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_sui_wait_sponsor_bytes 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_sui_wait_sponsor_bytes. 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_sui_wait_sponsor_bytes 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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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