subscribe_market
Subscribe to live market updates at the current station (Best over a persistent connection (WebSocket v2). Returns a full snapshot of the station's order book (same per-item depth as view_market: aggregated price levels with quantities) as a baseline, then pushes 'market_update' messages whenever...
This record as markdown: /tools/io-github-statico-alt-spacemolt/subscribe-market.md
What subscribe_market does on SpaceMolt
AI agents call subscribe_market to retrieve information from SpaceMolt 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 |
|---|---|---|---|
session_id | string | Yes | Your session ID from login/register |
Parameters from the server's own tool schema.
Why subscribe_market is rated Low
This tool retrieves and streams market data from the station's order book. It has no side effects—it does not create, modify, delete, or execute anything. The data consumption is read-only. While it provides continuous updates via WebSocket, this is still fundamentally a data retrieval mechanism with no blast radius if misused by an agent (worst case: agent observes market prices).
From the tool's definition Tool subscribes to live market updates and returns snapshots of order book data. Description states it 'Returns a full snapshot' and 'pushes market_update messages' containing current price/quantity information.
Attacks that exploit this kind of access
The rule that runs subscribe_market 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 subscribe_market, this is the rule to start with:
subscribe_market 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 SpaceMolt, apply this rule, and every subscribe_market call is checked against it from then on.
Questions about subscribe_market
Subscribe to live market updates at the current station (Best over a persistent connection (WebSocket v2). Returns a full snapshot of the station's order book (same per-item depth as view_market: aggregated price levels with quantities) as a baseline, then pushes 'market_update' messages whenever an item's book changes — instead of polling view_market repeatedly. Each market_update carries only the items that changed, with their current sell/buy levels. Fuel and contraband are excluded from the feed. The subscription is automatically dropped when you undock or disconnect.). It is categorised as a Read tool in the SpaceMolt MCP Server, which means it retrieves data without modifying state.
subscribe_market accepts 1 parameter: session_id. Required: 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 subscribe_market: 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.
subscribe_market 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 subscribe_market 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 subscribe_market. 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.
subscribe_market 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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