break_on_xhr
Sets a breakpoint that triggers when an XHR/Fetch request URL contains the specified string.
This record as markdown: /tools/1600822305-js-reverse-mcp/break-on-xhr.md
What break_on_xhr does on Js Reverse
AI agents invoke break_on_xhr to trigger actions in Js Reverse. 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.
Why break_on_xhr is rated High
Setting a breakpoint is an active browser debugging operation that modifies the browser's execution state and intercepts/pauses JavaScript execution when conditions are met. This is an Execute-category action as it triggers external operations in the browser runtime. Misuse could intercept sensitive network requests or disrupt application flow.
From the tool's definition Sets a breakpoint that triggers when an XHR/Fetch request URL contains the specified string
Attacks that exploit this kind of access
The rule that runs break_on_xhr safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Js Reverse, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For break_on_xhr, this is the rule to start with:
break_on_xhr stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Js Reverse, apply this rule, and every break_on_xhr call is checked against it from then on.
Questions about break_on_xhr
Sets a breakpoint that triggers when an XHR/Fetch request URL contains the specified string. It is categorised as a Execute tool in the Js Reverse MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Js Reverse MCP server in PolicyLayer and add a rule for break_on_xhr: 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 Js Reverse. Nothing to install.
break_on_xhr 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 break_on_xhr 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 break_on_xhr. 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.
break_on_xhr is provided by the Js Reverse MCP server (1600822305/js-reverse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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