Get the full parameter schema for a specific tool.
AI agents call get_tool_schema to retrieve information from Fastmcp Gateway without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries and returns schema information about available tools. It has no side effects, does not execute code or commands, and does not modify any state. The blast radius of misuse is minimal — an agent might discover tool signatures, but cannot act on them without invoking other tools like execute_tool or execute_code.
From the tool's definition Tool name is 'get_tool_schema' and description states 'Get the full parameter schema for a specific tool' — this retrieves metadata without modifying or executing any underlying tools or data.
Attacks that exploit this kind of access
Get the full parameter schema for a specific tool. It is categorised as a Read tool in the Fastmcp Gateway MCP Server, which means it retrieves data without modifying state.
Register the Fastmcp Gateway MCP server in PolicyLayer and add a rule for get_tool_schema: 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 Fastmcp Gateway. Nothing to install.
get_tool_schema 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_tool_schema 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_tool_schema. 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_tool_schema is provided by the Fastmcp Gateway MCP server (ultrathink-solutions/fastmcp-gateway). 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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