Execute an element action and capture what changed in the UI. Returns before/after diff with categorization.
AI agents invoke sdk_execute_with_diff to trigger actions in UI Bridge MCP. 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 executes actions on UI elements, which can have arbitrary side effects depending on what elements and actions the AI agent targets. While it captures diffs for visibility, the execution itself is not limited to read-only operations—it performs actions that modify application state.
From the tool's definition Tool name contains 'execute' and description states 'Execute an element action' and 'capture what changed in the UI'. It triggers UI interactions whose effects depend on which element is targeted and what action is performed.
Attacks that exploit this kind of access
Execute an element action and capture what changed in the UI. Returns before/after diff with categorization. It is categorised as a Execute tool in the UI Bridge MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the UI Bridge MCP server in PolicyLayer and add a rule for sdk_execute_with_diff: 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 UI Bridge MCP. Nothing to install.
sdk_execute_with_diff 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 sdk_execute_with_diff 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 sdk_execute_with_diff. 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.
sdk_execute_with_diff is provided by the UI Bridge MCP server (qontinui/ui-bridge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
sdk_execute_with_diff is one line of UI Bridge's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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