Read tags from local cache file without network.
AI agents call read_tagger_cache 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 cached tag data locally without making network requests or modifying any data. It is a straightforward read operation with no ability to create, modify, or delete data. The blast radius if misused by an AI agent is minimal—it can only expose cached information already stored locally.
From the tool's definition Tool name is 'read_tagger_cache' and description states 'Read tags from local cache file without network.' The verb 'read' and the explicit statement of reading from a cache file indicate data retrieval with no side effects.
Attacks that exploit this kind of access
Read tags from local cache file without network. 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 read_tagger_cache: 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.
read_tagger_cache 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 read_tagger_cache 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 read_tagger_cache. 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.
read_tagger_cache 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.
read_tagger_cache is one line of Scryfall MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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