Get the change buffer size and enabled status in the runner
AI agents call ui_change_buffer_size to retrieve information from UI Bridge MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries configuration state (change buffer size and enabled status) from the runner without modifying, executing, or destructing anything. It is a straightforward information retrieval operation with minimal blast radius if misused.
From the tool's definition Tool name 'ui_change_buffer_size' and description 'Get the change buffer size and enabled status in the runner' indicate a retrieval operation. The verb 'Get' explicitly denotes a read-only query with no side effects.
Attacks that exploit this kind of access
Get the change buffer size and enabled status in the runner. It is categorised as a Read tool in the UI Bridge MCP MCP Server, which means it retrieves data without modifying state.
Register the UI Bridge MCP server in PolicyLayer and add a rule for ui_change_buffer_size: 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.
ui_change_buffer_size 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 ui_change_buffer_size 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 ui_change_buffer_size. 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.
ui_change_buffer_size 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →