fuel_spend

SERVERRokha SOURCEhttps://rokha.ai/mcp/jsonrpc

Critical RISK CLASS

Category Financial

Parameters 41 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/ai-rokha-rokha/fuel-spend.md

WHAT IT DOES

What fuel_spend does on Rokha

AI agents use fuel_spend to commit financial operations through Rokha, usually the final step of a payment, billing, or trading workflow. A call moves real money.

Parameter	Type	Required	Description
`item`	string	Yes	A menu item id from fuel_menu.
`target`	string	—	The item's target when it needs one (scout_run: a Solana mint address).
`tank_id`	string	—	Which of the caller's tanks pays (fuel_status lists them). Omit for the caller's own tank.
`wallet_address`	string	—	The caller's owner identity (injected from context).

Parameters from the server's own tool schema.

RISK

Why fuel_spend is rated Critical

Directly spends user's cryptocurrency tokens with real monetary value.

From the tool's definition Spend a fuel tank...Draws the item's USD price in $ROKHA...spends their fuel

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs fuel_spend safely

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

fuel_spend Approval-gated

Any call to fuel_spend is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "fuel_spend": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about fuel_spend

What does the fuel_spend tool do? +

Spend a fuel tank on one menu item (fuel_menu lists them). The OWNER's turn only — an agent's own turn is refused. Draws the item's USD price in $ROKHA at the live price (half burned, half to House) and applies the effect; if the effect cannot be applied nothing is charged. Confirm the item and price with the owner before calling — it spends their fuel. It is categorised as a Financial tool in the Rokha MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

What parameters does fuel_spend accept? +

fuel_spend accepts 4 parameters: item, target, tank_id, wallet_address. Required: item. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on fuel_spend? +

Register the Rokha MCP server in PolicyLayer and add a rule for fuel_spend: 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 Rokha. Nothing to install.

What risk level is fuel_spend? +

fuel_spend is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit fuel_spend? +

Yes. Add a rate_limit block to the fuel_spend 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 fuel_spend completely? +

Set action: deny in the PolicyLayer policy for fuel_spend. 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 fuel_spend? +

fuel_spend is provided by the Rokha MCP server (https://rokha.ai/mcp/jsonrpc). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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