Extracts key-value pairs from arbitrary noisy text and returns them as type-safe JSON (dict).
AI agents call extract_json to retrieve information from Flexible Key-Value Extracting MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs text parsing and data extraction with no side effects. It reads unstructured input and converts it to structured JSON format. There is no mention of persistence, external calls, data modification, or irreversible operations. The output is a new transformed representation of existing data, making this a straightforward Read category tool.
From the tool's definition Tool "extracts key-value pairs from arbitrary noisy text and returns them as type-safe JSON". No mutation, deletion, or code execution capabilities described. Purely transforms and structures input text into output JSON.
Attacks that exploit this kind of access
Extracts key-value pairs from arbitrary noisy text and returns them as type-safe JSON (dict). It is categorised as a Read tool in the Flexible Key-Value Extracting MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Flexible Key-Value Extracting 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 Flexible Key-Value Extracting 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 Flexible Key-Value Extracting MCP Server MCP server (kunihiros/kv-extractor-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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