Search for Magic cards using Scryfall syntax. Examples: "f:commander id:sultai t:creature", "o:destroy t:instant cmc<=3" See https://scryfall.com/docs/syntax for full syntax reference.
Risk signalsAccepts freeform code/query input (query)
Part of the MTG MCP Server server.
Free to start. No card required.
AI agents may call scryfall_search_cards to permanently remove or destroy resources in MTG MCP Server. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call scryfall_search_cards in a loop, permanently destroying resources in MTG MCP Server. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"scryfall_search_cards"
]
}See the full MTG MCP Server policy for all 69 tools.
These attack patterns abuse exactly the kind of access scryfall_search_cards gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Search for Magic cards using Scryfall syntax. Examples: "f:commander id:sultai t:creature", "o:destroy t:instant cmc<=3" See https://scryfall.com/docs/syntax for full syntax reference.. It is categorised as a Destructive tool in the MTG MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MTG MCP Server MCP server in PolicyLayer and add a rule for scryfall_search_cards: 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 MTG MCP Server. Nothing to install.
scryfall_search_cards is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the scryfall_search_cards 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 scryfall_search_cards. 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.
scryfall_search_cards is provided by the MTG MCP Server MCP server (pypi:mtg-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 69 MTG MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.