AI agents call prettify_json 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 |
|---|---|---|---|
indent | integer | — | Indentation spaces |
sort_keys | boolean | — | Sort keys alphabetically |
json_string | string | Yes | JSON string to prettify |
Parameters from the server's own tool schema.
This is a deterministic formatting utility that only reformats the structure of a JSON string for readability. It retrieves and processes data without creating, modifying, deleting, executing code, or triggering external operations. The output is derived from the input with no persistent changes or external effects.
From the tool's definition Tool name 'prettify_json' and description 'Prettify (format) a JSON string' indicate a pure formatting operation. The tool takes JSON input and returns reformatted output with no side effects, data modification, or external operations.
Attacks that exploit this kind of access
Prettify (format) a JSON string. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
prettify_json accepts 3 parameters: indent, sort_keys, 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 prettify_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 TinyFn. Nothing to install.
prettify_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 prettify_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 prettify_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.
prettify_json 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.
prettify_json 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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