PERCEPTION (P8 §5.6): report this substrate
AI agents call myco_query_substrate_id to retrieve information from Myco — Agent-First Cognitive Substrate without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or reports information about the substrate itself. It is a read-only perception operation that queries state without modifying, executing external commands, or affecting data integrity. The absence of action words like 'create', 'delete', 'execute', or 'pay' confirms it is Read category. Severity is low because reporting substrate metadata poses minimal risk even if misused by an agent.
From the tool's definition Tool name contains 'query'; description states 'report this substrate' which is a retrieval operation with no mutation or side effects.
Attacks that exploit this kind of access
PERCEPTION (P8 §5.6): report this substrate. It is categorised as a Read tool in the Myco — Agent-First Cognitive Substrate MCP Server, which means it retrieves data without modifying state.
Register the Myco — Agent-First Cognitive Substrate MCP server in PolicyLayer and add a rule for myco_query_substrate_id: 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 Myco — Agent-First Cognitive Substrate. Nothing to install.
myco_query_substrate_id 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 myco_query_substrate_id 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 myco_query_substrate_id. 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.
myco_query_substrate_id is provided by the Myco — Agent-First Cognitive Substrate MCP server (myco). 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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