extract_json
AI agents call extract_json to retrieve information from Ultimate-MCP-Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name indicates JSON extraction, which is typically a read operation that retrieves or queries structured data without creating, modifying, or deleting anything. The empty description reduces confidence slightly, but the naming pattern aligns with other sibling Read tools (extract_key_value_pairs, extract_semantic_schema, extract_table).
From the tool's definition Tool name 'extract_json' suggests data extraction without modification. No description provided to confirm side effects.
Attacks that exploit this kind of access
extract_json. It is categorised as a Read tool in the Ultimate-MCP-Server MCP Server, which means it retrieves data without modifying state.
Register the Ultimate-MCP-Server MCP server in PolicyLayer and add a rule for extract_json: 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 Ultimate-MCP-Server. Nothing to install.
extract_json 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_json 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_json. 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_json is provided by the Ultimate-MCP-Server MCP server (logos-parthenos-ai/ultimate_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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