Find all symbols that are called or referenced by the specified symbol by its numeric ID.
AI agents call knowledge_get_callees to retrieve information from Knowledge MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves call graph information for analysis purposes. It has no side effects—it only reads and returns data about which symbols reference other symbols. While the sibling tools include a destructive operation (knowledge_delete_repo), this specific tool performs pure retrieval with no capability to modify, delete, or execute code.
From the tool's definition The tool 'Find all symbols that are called or referenced by the specified symbol' performs a query operation that retrieves data about function/symbol relationships without modifying, deleting, or executing code. It is purely informational retrieval.
Attacks that exploit this kind of access
Find all symbols that are called or referenced by the specified symbol by its numeric ID. It is categorised as a Read tool in the Knowledge MCP MCP Server, which means it retrieves data without modifying state.
Register the Knowledge MCP server in PolicyLayer and add a rule for knowledge_get_callees: 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 Knowledge MCP. Nothing to install.
knowledge_get_callees 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 knowledge_get_callees 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 knowledge_get_callees. 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.
knowledge_get_callees is provided by the Knowledge MCP server (paulthesecond/knowledgebase-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.
Teams ship this data inside their own products. See what a licence covers →