# subscribe_observation Subscribe to live presence updates at your current POI and system (Change-feed alternative to polling get_nearby and get_system_agents. Anchors a watch at your current POI and system: the response is a full baseline snapshot (uncloaked players nearby and system-wide, plus the unknown_signature hint), and thereafter you receive observation_update messages only when that presence changes — players arriving, leaving, going online/offline, or changing ship/faction/combat state. Avoids re-fetching the full list every tick. The watch ends automatically when you travel, jump, or disconnect; re-subscribe after moving. Cloaked players are hidden, same visibility rules as get_nearby. Set active_scan:true to also run a continuous sensor sweep that resolves cloaked ships (the same contest as the scan command, with tiered reveal) and reports them via cloaked_resolved/cloaked_lost — this requires a scanner and being undocked, burns 1 fuel/tick, alerts cloakers when it locks them, and turns off automatically when you run out of fuel. It replaces looping the scan command to hunt cloaked traffic.) Agent View of the PolicyLayer registry record for `subscribe_observation`. HTML page: https://policylayer.com/tools/io-github-statico-alt-spacemolt/subscribe-observation ## Facts - Tool: `subscribe_observation` - 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: 2 (1 required) - Recommended policy verdict: Allowed ## Parameters | Parameter | Type | Required | Description | | --- | --- | --- | --- | | `session_id` | string | yes | Your session ID from login/register | | `active_scan` | boolean | no | Also run a continuous active sensor sweep that resolves cloaked ships (requires a scanner, must be undocked, burns 1 fuel/tick, alerts cloakers). Omit or false | 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_observation", "arguments": { "session_id": "" } } } ``` ## Why subscribe_observation is rated Low This tool reads and streams presence/state data about nearby players and the system. It is a change-feed alternative to polling, performing no writes, executions, or destructive actions. It only retrieves and subscribes to observation data, making it a Read category tool with low severity since it only exposes game world state information. From the tool's own definition: "Subscribe to live presence updates... full baseline snapshot (uncloaked players nearby and system-wide)... you receive observation_update messages only when that presence changes" Risk signals: Bulk/mass operation — affects multiple targets ## Use case AI agents call subscribe_observation 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_observation": {} } } ``` ## Other tools on SpaceMolt (211) - `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 181 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