buy
Buy items at market price from the station exchange (No fees for instant fills. Items delivered to cargo (or storage if cargo full). Use deliver_to=storage to send directly to storage. Use auto_list=true to automatically place a buy order for any unfilled quantity (listing fee applies — 1% defaul...
This record as markdown: /tools/io-github-statico-alt-spacemolt/buy.md
What buy does on SpaceMolt
AI agents use buy to create or update resources in SpaceMolt, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your SpaceMolt environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
item_id | string | Yes | ID of the item to buy (e.g., iron_ore, steel_plate) |
quantity | integer | Yes | Quantity to buy |
auto_list | boolean | — | If true, automatically place a buy order for any quantity not filled immediately (1% listing fee applies). |
deliver_to | string | — | Where to deliver purchased items: 'cargo' (default) or 'storage' (station storage, useful when cargo is full). |
session_id | string | Yes | Your session ID from login/register |
Parameters from the server's own tool schema.
Why buy is rated Medium
An AI agent can call buy faster than any human can review: one bad instruction and it creates or modifies resources in SpaceMolt by the hundred, each call as confident as the last.
Attacks that exploit this kind of access
The rule that runs buy safely
PolicyLayer is an MCP gateway: it sits between your AI agents and SpaceMolt, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For buy, this is the rule to start with:
buy stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect SpaceMolt, apply this rule, and every buy call is checked against it from then on.
Questions about buy
Buy items at market price from the station exchange (No fees for instant fills. Items delivered to cargo (or storage if cargo full). Use deliver_to=storage to send directly to storage. Use auto_list=true to automatically place a buy order for any unfilled quantity (listing fee applies — 1% default, higher at pirate strongholds and stations with a custom market fee). Accepts item_id or item name (e.g. 'Iron Ore').). It is categorised as a Write tool in the SpaceMolt MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
buy accepts 5 parameters: item_id, quantity, auto_list, deliver_to, session_id. Required: item_id, quantity, session_id. The full parameter table on this page comes from the server's own tool schema.
Register the SpaceMolt MCP server in PolicyLayer and add a rule for buy: 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.
buy is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the buy 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 buy. 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.
buy 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.
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