Fields \u00b7 query greymatterField. Variables: by. Example variables: {\
AI agents call greymatter_field to retrieve information from ReliaQuest GreyMatter MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a query operation to retrieve field information. The 'query' terminology and structure (taking 'by' as a filter parameter) indicates data retrieval without modification. There is no mention of creating, modifying, deleting, or executing arbitrary operations. This is a standard Read operation with low risk, as it only retrieves data.
From the tool's definition Tool name 'greymatter_field' with description indicating 'query greymatterField' operation and variables parameter 'by', consistent with querying or retrieving field data from the GreyMatter platform.
Attacks that exploit this kind of access
Fields \u00b7 query greymatterField. Variables: by. Example variables: {\. It is categorised as a Read tool in the ReliaQuest GreyMatter MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ReliaQuest GreyMatter MCP Server MCP server in PolicyLayer and add a rule for greymatter_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 ReliaQuest GreyMatter MCP Server. Nothing to install.
greymatter_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 greymatter_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 greymatter_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.
greymatter_field is provided by the ReliaQuest GreyMatter MCP Server MCP server (space-c0wboy/reliaquest-greymatter-mcp-server). 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.
Teams ship this data inside their own products. See what a licence covers →