GET /api/categories
AI agents call get_categories to retrieve information from REI Crypto 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 category data from a crypto data API. It performs a simple GET request with no side effects, no financial transactions, and no destructive operations. The blast radius of misuse is minimal—an agent could only retrieve unwanted categories information, not modify or delete data. Low severity reflects the read-only nature and lack of sensitive operational impact.
From the tool's definition Tool name 'get_categories' and HTTP method 'GET' indicate data retrieval. Description shows it queries a '/api/categories' endpoint without modifying, deleting, or executing operations.
Attacks that exploit this kind of access
GET /api/categories. It is categorised as a Read tool in the REI Crypto MCP Server MCP Server, which means it retrieves data without modifying state.
Register the REI Crypto MCP Server MCP server in PolicyLayer and add a rule for get_categories: 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 REI Crypto MCP Server. Nothing to install.
get_categories 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 get_categories 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 get_categories. 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.
get_categories is provided by the REI Crypto MCP Server MCP server (0xreisearch/crypto-mcp-beta). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_categories is one line of REI Crypto 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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