Get detailed information about a specific field in a type
AI agents call field to retrieve information from GraphQL Schema Explorer without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only reads and returns schema metadata about GraphQL type fields. It has no side effects, cannot modify data, execute operations, or trigger external actions. The worst misuse would be information disclosure of the API structure itself, which is low severity since schema introspection is typically a low-risk operation and GraphQL schemas are often publicly discoverable.
From the tool's definition Tool retrieves 'detailed information about a specific field in a type' - a pure query operation with no modification, deletion, or execution capability. Described as part of 'introspection and exploration' of GraphQL schema metadata.
Attacks that exploit this kind of access
Get detailed information about a specific field in a type. It is categorised as a Read tool in the GraphQL Schema Explorer MCP Server, which means it retrieves data without modifying state.
Register the GraphQL Schema Explorer MCP server in PolicyLayer and add a rule for field: 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 GraphQL Schema Explorer. Nothing to install.
field 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 field 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 field. 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.
field is provided by the GraphQL Schema Explorer MCP server (martinshumberto/mcp-server-graphql). 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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