Find where a symbol (function, class, variable) is imported or referenced across the project. Returns results grouped by file. Complements fullscope_skeleton — skeleton shows what a file provides, usages shows where those exports are consumed. Best for: debugging
AI agents call fullscope_usages to retrieve information from Mcp Agent Opt without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only search across the codebase to locate where symbols are referenced. It retrieves and returns information about usage patterns but does not create, modify, delete, or execute any code. The explicit purpose of 'debugging' via reference finding confirms this is a passive analysis tool with no side effects.
From the tool's definition Tool name 'fullscope_usages' and description 'Find where a symbol...is imported or referenced across the project.
Attacks that exploit this kind of access
Find where a symbol (function, class, variable) is imported or referenced across the project. Returns results grouped by file. Complements fullscope_skeleton — skeleton shows what a file provides, usages shows where those exports are consumed. Best for: debugging. It is categorised as a Read tool in the Mcp Agent Opt MCP Server, which means it retrieves data without modifying state.
Register the Mcp Agent Opt MCP server in PolicyLayer and add a rule for fullscope_usages: 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 Mcp Agent Opt. Nothing to install.
fullscope_usages 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 fullscope_usages 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 fullscope_usages. 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.
fullscope_usages is provided by the Mcp Agent Opt MCP server (justguy/fullscope-mcp). 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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