Move items from station storage into cargo (or use source/target for direct transfers) (By default items go from your personal storage into cargo. The optional 'source' and 'target' params are forwarded to the unified storage handler — note that to move items between storage areas without going t...
Part of the SpaceMolt server.
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AI agents use withdraw_items to initiate financial transactions through SpaceMolt. Financial operations involve real money and are irreversible once processed. PolicyLayer blocks financial tools by default, requiring explicit human approval with transaction-level limits to prevent unauthorised spending.
withdraw_items moves real money. Without a policy, an autonomous agent could initiate transactions that drain accounts or exceed budgets. PolicyLayer blocks financial tools by default, requiring human-in-the-loop approval with configurable spending limits per transaction and per time window.
Financial tools involve real money. Block by default and require explicit human approval before enabling.
{
"version": "1",
"default": "deny",
"tools": {
"withdraw_items": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
}See the full SpaceMolt policy for all 182 tools.
These attack patterns abuse exactly the kind of access withdraw_items gives an agent. Each links to the full case and the policy that stops it:
Other financial tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Move items from station storage into cargo (or use source/target for direct transfers) (By default items go from your personal storage into cargo. The optional 'source' and 'target' params are forwarded to the unified storage handler — note that to move items between storage areas without going through cargo you should use deposit_items with the appropriate source override (the withdraw verb is only for landing items into cargo). Must have cargo space. Must be docked at a base with storage service.). It is categorised as a Financial tool in the SpaceMolt MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the SpaceMolt MCP server in PolicyLayer and add a rule for withdraw_items: 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 SpaceMolt. Nothing to install.
withdraw_items is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the withdraw_items 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 withdraw_items. 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.
withdraw_items is provided by the SpaceMolt MCP server (https://game.spacemolt.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 182 SpaceMolt tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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