Gets the source code of a JavaScript script by its script ID. Supports line range (for normal files) or character offset (for minified single-line files). Use list_scripts first to find the script ID.
AI agents call get_script_source to retrieve information from JS Reverse MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a query/retrieval operation to inspect existing script source code. It enables analysis and debugging but does not execute code, modify files, delete data, or create financial obligations. The action is informational only, reading what is already present in the JavaScript runtime.
From the tool's definition Tool description states 'Gets the source code' with no mention of modification, deletion, execution, or side effects. It retrieves data from already-loaded JavaScript.
Attacks that exploit this kind of access
Gets the source code of a JavaScript script by its script ID. Supports line range (for normal files) or character offset (for minified single-line files). Use list_scripts first to find the script ID. It is categorised as a Read tool in the JS Reverse MCP MCP Server, which means it retrieves data without modifying state.
Register the JS Reverse MCP server in PolicyLayer and add a rule for get_script_source: 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 MCP. Nothing to install.
get_script_source 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 get_script_source 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 get_script_source. 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.
get_script_source is provided by the JS Reverse MCP server (noone-hub/jsreverser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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