unflatten_json

Unflatten a flat JSON object back to nested structure.

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

Low RISK CLASS

Category Read

Parameters 21 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What unflatten_json does on TinyFn

AI agents call unflatten_json 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
`separator`	string	—	Key separator
`json_string`	string	Yes	Flattened JSON string

Parameters from the server's own tool schema.

RISK

Why unflatten_json is rated Low

This tool performs a deterministic data transformation (converting a flat JSON structure to a nested one) with no side effects, no data persistence, no execution of code, and no destructive operations. It is a pure read/transform operation analogous to encoding or conversion utilities on this server.

From the tool's definition Unflatten a flat JSON object back to nested structure

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs unflatten_json 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 unflatten_json, this is the rule to start with:

unflatten_json Allowed

unflatten_json 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": {
    "unflatten_json": {}
  }
}

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 unflatten_json call is checked against it from then on.

FAQ

Questions about unflatten_json

What does the unflatten_json tool do? +

Unflatten a flat JSON object back to nested structure. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.

What parameters does unflatten_json accept? +

unflatten_json accepts 2 parameters: separator, 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 unflatten_json? +

Register the TinyFn MCP server in PolicyLayer and add a rule for unflatten_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.

What risk level is unflatten_json? +

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

Can I rate-limit unflatten_json? +

Yes. Add a rate_limit block to the unflatten_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.

How do I block unflatten_json completely? +

Set action: deny in the PolicyLayer policy for unflatten_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.

What MCP server provides unflatten_json? +

unflatten_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.

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