# 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.) Agent View of the PolicyLayer registry record for `subscribe_market`. HTML page: https://policylayer.com/tools/io-github-statico-alt-spacemolt/subscribe-market ## Facts - Tool: `subscribe_market` - Server: SpaceMolt (`https://game.spacemolt.com/mcp`) — https://policylayer.com/tools/io-github-statico-alt-spacemolt.md - Homepage: https://github.com/SpaceMolt/gameserver - Risk category: Read (Low risk) - Registry record: grade F, identity unverified - Server auth posture: open - Server rate-limited: no - Parameters: 1 (1 required) - Recommended policy verdict: Allowed ## Parameters | Parameter | Type | Required | Description | | --- | --- | --- | --- | | `session_id` | string | yes | Your session ID from login/register | Parameters from the server's own tool schema. ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "subscribe_market", "arguments": { "session_id": "" } } } ``` ## 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 own 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." ## Use case 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. ## Recommended policy (PolicyLayer) Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches SpaceMolt: ```json { "version": "1", "default": "deny", "tools": { "subscribe_market": {} } } ``` ## Other tools on SpaceMolt (210) - `cancel_ship_buy_order` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/cancel-ship-buy-order.md - `captains_log_delete` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/captains-log-delete.md - `commission_ship` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/commission-ship.md - `craft` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/craft.md - `delete_note` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/delete-note.md - `faction_delete_role` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/faction-delete-role.md - `faction_delete_room` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/faction-delete-room.md - `fleet` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/fleet.md - `forum_delete_reply` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/forum-delete-reply.md - `forum_delete_thread` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/forum-delete-thread.md - `jettison` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/jettison.md - `recycle` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/recycle.md - `refit_ship` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/refit-ship.md - `scrap_ship` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/scrap-ship.md - `self_destruct` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/self-destruct.md - `shipping` — Destructive — https://policylayer.com/tools/io-github-statico-alt-spacemolt/shipping.md - `attack` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/attack.md - `battle` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/battle.md - `buy_ship_license` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/buy-ship-license.md - `citizenship` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/citizenship.md - `cloak` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/cloak.md - `deploy_drone` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/deploy-drone.md - `dock` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/dock.md - `facility` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/facility.md - `faction_declare_war` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/faction-declare-war.md - `hunt` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/hunt.md - `jump` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/jump.md - `mine` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/mine.md - `reload` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/reload.md - `station` — Execute — https://policylayer.com/tools/io-github-statico-alt-spacemolt/station.md - …and 180 more: https://policylayer.com/tools/io-github-statico-alt-spacemolt.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-statico-alt-spacemolt · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-statico-alt-spacemolt