clear_knowledge_base

THE RISK

Critical Risk

Why clear_knowledge_base needs a policy

This tool permanently and irreversibly deletes all data stored in the Neo4j knowledge graph. The cumulative loss of all code repositories, documentation, and analysis data represents a catastrophic, unrecoverable action. Even though confirmation is required, the tool itself performs a destructive operation that cannot be undone. This represents the highest severity risk—total data loss of the knowledge base.

From the tool's definition Tool name is 'clear_knowledge_base' with description 'Clear all data from knowledge base (DANGEROUS - requires confirmation)'. The description explicitly warns 'DANGEROUS' and the operation irreversibly deletes all data from the knowledge base.

Risk signalsBulk/mass operation — affects multiple targets

Documented attack patterns abuse exactly the kind of access clear_knowledge_base gives an agent:

POLICY

How to control clear_knowledge_base

PolicyLayer is an MCP gateway — it sits between your AI agents and Code Graph Knowledge System, and nothing reaches the server without passing your rules. This is the rule we recommend for clear_knowledge_base:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "clear_knowledge_base"
  ]
}

clear_knowledge_base disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Code Graph Knowledge System — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Code Graph Knowledge System tools

Destructive delete_memory Delete memory (soft delete - data retained). Execute cancel_task Cancel a pending or running task. Write code_graph_ingest_repo code_graph_ingest_repo Write add_directory Add all files from a directory to the knowledge base. Processes recursively. Write add_document add_document Write add_file Add a file to the knowledge base. Supports text files, code files, and documents. Write add_memory add_memory Write supersede_memory Create new memory that supersedes old one (preserves history).

All 30 Code Graph Knowledge System tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in Code Graph Knowledge System → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about clear_knowledge_base

What does the clear_knowledge_base tool do? +

Clear all data from knowledge base (DANGEROUS - requires confirmation). It is categorised as a Destructive tool in the Code Graph Knowledge System MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on clear_knowledge_base? +

Register the Code Graph Knowledge System MCP server in PolicyLayer and add a rule for clear_knowledge_base: 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 Code Graph Knowledge System. Nothing to install.

What risk level is clear_knowledge_base? +

clear_knowledge_base is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit clear_knowledge_base? +

Yes. Add a rate_limit block to the clear_knowledge_base 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.

How do I block clear_knowledge_base completely? +

Set action: deny in the PolicyLayer policy for clear_knowledge_base. 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.

What MCP server provides clear_knowledge_base? +

clear_knowledge_base is provided by the Code Graph Knowledge System MCP server (royisme/codebase-rag). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Code Graph Knowledge System tool call.

Start from Code Graph Knowledge System, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →