json_prettify
Prettify JSON (format with indentation).
This record as markdown: /tools/io-tinyfn-tinyfn/json-prettify.md
What json_prettify does on TinyFn
AI agents call json_prettify 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 |
|---|---|---|---|
indent | integer | — | Indentation spaces |
json_str | string | Yes | JSON to prettify |
Parameters from the server's own tool schema.
Why json_prettify is rated Low
This tool only reformats JSON for readability by adding indentation and whitespace. It does not retrieve data from external sources, create/modify stored data, execute code, delete anything, or involve financial transactions. It is a deterministic formatting utility that transforms input to output without side effects, characteristic of the Read category.
From the tool's definition Tool name 'json_prettify' and description 'Prettify JSON (format with indentation)' indicate a read-only operation that reformats JSON structure without modifying data or producing side effects.
Attacks that exploit this kind of access
The rule that runs json_prettify 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_prettify, this is the rule to start with:
json_prettify 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_prettify call is checked against it from then on.
Questions about json_prettify
Prettify JSON (format with indentation). It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
json_prettify accepts 2 parameters: indent, json_str. Required: json_str. 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_prettify: 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_prettify 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_prettify 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_prettify. 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_prettify 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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