get_json_type

Get the type of a JSON value.

SERVERTinyFn SOURCEhttps://api.tinyfn.io/mcp/all/

Low RISK CLASS

Category Read

Parameters 11 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-tinyfn-tinyfn/get-json-type.md

WHAT IT DOES

What get_json_type does on TinyFn

AI agents call get_json_type to retrieve information from TinyFn without modifying anything. It is 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.

RISK

Why get_json_type is rated Low

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

RECOMMENDED RULE

The rule that runs get_json_type safely

PolicyLayer is an MCP gateway: it sits between your AI agents and TinyFn, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For get_json_type, this is the rule to start with:

get_json_type Allowed

get_json_type is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_json_type": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every get_json_type call is checked against it from then on.

FAQ

Questions about get_json_type

What does the get_json_type tool do? +

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.

What parameters does get_json_type accept? +

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.

How do I enforce a policy on get_json_type? +

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.

What risk level is get_json_type? +

get_json_type is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_json_type? +

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.

How do I block get_json_type completely? +

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.

What MCP server provides get_json_type? +

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.

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