Search Commander Spellbook variants (combos) by filters like uses/produces.
AI agents call csb_variants_search to retrieve information from Scryfall MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool searches and retrieves combo variant data from Commander Spellbook based on filter criteria. It performs a read-only query against a database of Magic: The Gathering combo information. No data is created, modified, deleted, or executed—only retrieved. This aligns with the Read category definition: 'retrieves or queries data; no side effects (search, list, get, fetch).'
From the tool's definition Tool name 'csb_variants_search' and description 'Search Commander Spellbook variants (combos) by filters' indicates querying/searching functionality.
Attacks that exploit this kind of access
Search Commander Spellbook variants (combos) by filters like uses/produces. It is categorised as a Read tool in the Scryfall MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Scryfall MCP Server MCP server in PolicyLayer and add a rule for csb_variants_search: 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 Scryfall MCP Server. Nothing to install.
csb_variants_search 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 csb_variants_search 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 csb_variants_search. 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.
csb_variants_search is provided by the Scryfall MCP Server MCP server (latte-chan/scryfall-connector). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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