diff_globals
Compares current global variables with a previous snapshot. Shows added, removed, and changed variables. Use after snapshot_globals to find what changed.
This record as markdown: /tools/1600822305-js-reverse-mcp/diff-globals.md
What diff_globals does on Js Reverse
AI agents call diff_globals to retrieve information from Js Reverse without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why diff_globals is rated Low
diff_globals is a read-only diagnostic tool that performs comparative analysis of JavaScript global state. It takes snapshots (presumed to be taken separately) and reports differences. There is no evidence of mutation, execution of arbitrary code, deletion, or financial operations. The tool operates entirely in the observation/analysis domain, making it a Read category risk with low severity.
From the tool's definition The tool 'compares current global variables with a previous snapshot' and 'shows added, removed, and changed variables'—it retrieves and analyzes existing data without modifying it, creating side effects, executing code, deleting data, or moving money.
Attacks that exploit this kind of access
The rule that runs diff_globals 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 diff_globals, this is the rule to start with:
diff_globals is read-only, so it stays allowed. 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 diff_globals call is checked against it from then on.
Questions about diff_globals
Compares current global variables with a previous snapshot. Shows added, removed, and changed variables. Use after snapshot_globals to find what changed. It is categorised as a Read tool in the Js Reverse MCP Server, which means it retrieves data without modifying state.
Register the Js Reverse MCP server in PolicyLayer and add a rule for diff_globals: 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.
diff_globals 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 diff_globals 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 diff_globals. 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.
diff_globals 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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