# estimate_purchase Preview what buying would cost without executing (Read-only. Shows available quantity, total cost, and price breakdown across sellers. Accepts item_id or item name (e.g. 'Iron Ore').) Agent View of the PolicyLayer registry record for `estimate_purchase`. HTML page: https://policylayer.com/tools/io-github-statico-alt-spacemolt/estimate-purchase ## Facts - Tool: `estimate_purchase` - 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: 3 (3 required) - Recommended policy verdict: Allowed ## Parameters | Parameter | Type | Required | Description | | --- | --- | --- | --- | | `item_id` | string | yes | ID of the item to estimate buying | | `quantity` | integer | yes | Number of items to estimate buying | | `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": "estimate_purchase", "arguments": { "item_id": "", "quantity": 0, "session_id": "" } } } ``` ## Why estimate_purchase is rated Low This tool merely retrieves and displays market pricing information. It performs no transactions, modifications, or state changes. The explicit 'Read-only' designation and 'without executing' language confirm it is purely informational. Even in an MMO context with financial systems, previewing costs carries minimal risk since no actual purchase or resource movement occurs. From the tool's own definition: "Tool description explicitly states 'Preview what buying would cost without executing' and 'Read-only.' It accepts item identifiers and returns informational outputs (available quantity, total cost, price breakdown) with no side effects." ## Use case AI agents call estimate_purchase 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": { "estimate_purchase": {} } } ``` ## 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