AI agents call get_json_type to retrieve information from TinyFn without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
json_string | string | Yes | JSON string |
Parameters from the server's own tool schema.
This tool retrieves and returns information about a JSON value's type (string, number, object, array, boolean, null). It is purely informational with no ability to modify, delete, or execute code. It falls clearly under the Read category as a safe data query operation.
From the tool's definition Tool name 'get_json_type' and description 'Get the type of a JSON value' indicate a data inspection/query operation with no modification or side effects.
Attacks that exploit this kind of access
Get the type of a JSON value. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
get_json_type accepts 1 parameter: json_string. Required: json_string. The full parameter table on this page comes from the server's own tool schema.
Register the TinyFn MCP server in PolicyLayer and add a rule for get_json_type: 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 TinyFn. Nothing to install.
get_json_type 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_json_type 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_json_type. 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_json_type is provided by the TinyFn MCP server (https://api.tinyfn.io/mcp/all/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_json_type is one line of TinyFn's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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