kb_show

Retrieve a single entry

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-show.md

WHAT IT DOES

What kb_show does on Persistent Kb

AI agents call kb_show 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_show is rated Low

This tool queries and returns a single knowledge base entry from the persistent SQLite knowledge base. It performs a read-only operation with no side effects, matching the Read category definition of retrieves or queries data.

From the tool's definition Tool name 'kb_show' and description 'Retrieve a single entry' indicate a retrieval operation with no modification or deletion.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs kb_show 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_show, this is the rule to start with:

kb_show Allowed

kb_show 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_show": {}
  }
}

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_show call is checked against it from then on.

FAQ

Questions about kb_show

What does the kb_show tool do? +

Retrieve a single entry. 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_show? +

Register the Persistent Kb MCP server in PolicyLayer and add a rule for kb_show: 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_show? +

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

Can I rate-limit kb_show? +

Yes. Add a rate_limit block to the kb_show 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_show completely? +

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

kb_show 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.

KEEP EXPLORING

More on Persistent Kb, and thousands of servers like it.

This server

All 5 Persistent Kb tools →

Across the catalogue

The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →