This record as markdown: /tools/io-tinyfn-tinyfn/json-stats.md
What json_stats does on TinyFn
AI agents call json_stats 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 to analyze |
Parameters from the server's own tool schema.
Why json_stats is rated Low
The tool queries and returns statistical metadata about a JSON structure (e.g., size, depth, key counts). This is a pure read operation with no side effects, no code execution, and no data modification. It falls squarely in the Read category. Severity is low because misuse would only expose non-sensitive structural metadata about JSON data provided to it.
From the tool's definition Tool name 'json_stats' and description 'Get statistics about a JSON structure' indicate a read-only operation that analyzes and retrieves information about JSON data without modifying, executing code, or producing side effects.
Attacks that exploit this kind of access
The rule that runs json_stats 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 json_stats, this is the rule to start with:
json_stats is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect TinyFn, apply this rule, and every json_stats call is checked against it from then on.
Questions about json_stats
Get statistics about a JSON structure. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
json_stats 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 json_stats: 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.
json_stats 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_stats 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_stats. 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_stats 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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