Read oracleId→CSB id index from local cache.
AI agents call csb_read_card_index 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 retrieves pre-built index data from a local cache. It performs a simple lookup operation to map oracleIds to CSB IDs. There is no data modification, deletion, code execution, or external side effects. The operation is read-only and returns cached information, making it a straightforward Read category tool with low severity.
From the tool's definition Tool name contains 'read' and description explicitly states 'Read oracleId→CSB id index from local cache.' The verb 'read' combined with 'retrieve from local cache' indicates data retrieval with no side effects.
Attacks that exploit this kind of access
Read oracleId→CSB id index from local cache. 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_read_card_index: 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_read_card_index 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_read_card_index 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_read_card_index. 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_read_card_index 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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