break_on_subtree_modified
Sets a breakpoint that triggers when the DOM subtree of an element is modified (child added/removed). Useful for tracking dynamic content changes.
This record as markdown: /tools/1600822305-js-reverse-mcp/break-on-subtree-modified.md
What break_on_subtree_modified does on Js Reverse
AI agents invoke break_on_subtree_modified 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_subtree_modified is rated High
This tool triggers a browser debugging action (setting a DOM mutation breakpoint via Chrome DevTools Protocol) that causes execution to pause when DOM subtree changes occur. It actively controls browser behavior and intercepts execution flow, making it an Execute-category action. Misuse could interfere with normal browser operation or be used to monitor sensitive dynamic content changes.
From the tool's definition Sets a breakpoint that triggers when the DOM subtree of an element is modified (child added/removed)
Attacks that exploit this kind of access
The rule that runs break_on_subtree_modified 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_subtree_modified, this is the rule to start with:
break_on_subtree_modified 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_subtree_modified call is checked against it from then on.
Questions about break_on_subtree_modified
Sets a breakpoint that triggers when the DOM subtree of an element is modified (child added/removed). Useful for tracking dynamic content changes. 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_subtree_modified: 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_subtree_modified 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_subtree_modified 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_subtree_modified. 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_subtree_modified 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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