Retrieve a JSON value from Redis at a given path. Args: name: The Redis key where the JSON document is stored. path: The JSON path to retrieve (default: root '$'). Returns: The retrieved JSON value or an error message.
AI agents call json_get to retrieve information from Redis MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only retrieval operation on Redis data. It queries and fetches JSON documents without creating, modifying, deleting, or executing any operations. It has no side effects and matches the 'Read' category definition of retrieving or querying data.
From the tool's definition Tool description states 'Retrieve a JSON value from Redis' with arguments for key name and path. Returns 'The retrieved JSON value or an error message.' No modification, deletion, or execution capabilities described.
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access json_get gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Redis MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for json_get:
{
"version": "1",
"default": "deny",
"tools": {
"json_get": {}
}
}json_get is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve a JSON value from Redis at a given path. Args: name: The Redis key where the JSON document is stored. path: The JSON path to retrieve (default: root '$'). Returns: The retrieved JSON value or an error message. It is categorised as a Read tool in the Redis MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Redis MCP Server MCP server in PolicyLayer and add a rule for json_get: 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 Redis MCP Server. Nothing to install.
json_get 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 json_get 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 json_get. 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.
json_get is provided by the Redis MCP Server MCP server (redis/mcp-redis). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 53 Redis MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
53 Redis MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.