Map Scryfall oracle_id UUIDs to Commander Spellbook numeric IDs using the local index (builds if stale).
AI agents call csb_lookup_by_oracle_ids 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 is purely a data retrieval and indexing tool. It reads from and optionally updates a local index, but produces no side effects on the underlying data. The index rebuild is transparent maintenance to support lookups. All Scryfall server tools are informational (searching, retrieving, and mapping card metadata) with no write, destructive, or financial capabilities.
From the tool's definition The tool maps Scryfall oracle_id UUIDs to Commander Spellbook numeric IDs using a local index. It is a lookup/retrieval operation that 'builds if stale'—a maintenance action that creates or updates cached data for querying purposes only.
Attacks that exploit this kind of access
Map Scryfall oracle_id UUIDs to Commander Spellbook numeric IDs using the local index (builds if stale). 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_lookup_by_oracle_ids: 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_lookup_by_oracle_ids 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_lookup_by_oracle_ids 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_lookup_by_oracle_ids. 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_lookup_by_oracle_ids 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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