kb_search

Full-text search over the persistent knowledge base via SQLite FTS5.

SERVERPersistent Kb SOURCE0x67108864/persistent-kb-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/0x67108864-persistent-kb-mcp/kb-search.md

WHAT IT DOES

What kb_search does on Persistent Kb

AI agents call kb_search to retrieve information from Persistent Kb without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why kb_search is rated Low

This tool retrieves and searches existing knowledge base entries without creating, modifying, or deleting data. Full-text search is a standard read operation that queries data and returns results. No side effects or irreversible actions are possible from this search functionality.

From the tool's definition Tool name 'kb_search' and description 'Full-text search over the persistent knowledge base via SQLite FTS5' indicate a read-only query operation with no data modification or deletion capability.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs kb_search safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Persistent Kb, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For kb_search, this is the rule to start with:

kb_search Allowed

kb_search is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "kb_search": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Persistent Kb, apply this rule, and every kb_search call is checked against it from then on.

FAQ

Questions about kb_search

What does the kb_search tool do? +

Full-text search over the persistent knowledge base via SQLite FTS5. It is categorised as a Read tool in the Persistent Kb MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on kb_search? +

Register the Persistent Kb MCP server in PolicyLayer and add a rule for kb_search: 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 Persistent Kb. Nothing to install.

What risk level is kb_search? +

kb_search is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit kb_search? +

Yes. Add a rate_limit block to the kb_search 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 kb_search completely? +

Set action: deny in the PolicyLayer policy for kb_search. 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 kb_search? +

kb_search is provided by the Persistent Kb MCP server (0x67108864/persistent-kb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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