extract_metadata
Extract page metadata including JSON-LD, Open Graph, Twitter cards, and standard meta tags.
This record as markdown: /tools/1600822305-js-reverse-mcp/extract-metadata.md
What extract_metadata does on Js Reverse
AI agents call extract_metadata 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 extract_metadata is rated Low
This tool performs passive data retrieval of metadata already present in the DOM. It has no side effects, cannot modify or delete data, and poses minimal risk even if misused by an AI agent—the data extracted is publicly visible in the page source. Classified as Read with low severity.
From the tool's definition Tool description states it 'Extract[s] page metadata' from standard, publicly-exposed meta tags (JSON-LD, Open Graph, Twitter cards, meta tags). No modification, deletion, or execution of code is indicated.
Attacks that exploit this kind of access
The rule that runs extract_metadata 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 extract_metadata, this is the rule to start with:
extract_metadata 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 extract_metadata call is checked against it from then on.
Questions about extract_metadata
Extract page metadata including JSON-LD, Open Graph, Twitter cards, and standard meta tags. 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 extract_metadata: 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.
extract_metadata 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 extract_metadata 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 extract_metadata. 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.
extract_metadata 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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