kb_add

Save a fact, lesson, decision, or reference to the local persistent knowledge base.

SERVERPersistent Kb SOURCE0x67108864/persistent-kb-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

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

WHAT IT DOES

What kb_add does on Persistent Kb

AI agents use kb_add to create or update resources in Persistent Kb, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Persistent Kb environment.

RISK

Why kb_add is rated Medium

This tool creates or adds new entries to a knowledge base, which is a reversible write operation. It does not execute code, delete data, move money, or trigger external operations. The blast radius is low because the operation is local, confined to a knowledge base, and reversible—entries can be modified or removed.

From the tool's definition Tool name 'kb_add' and description 'Save a fact, lesson, decision, or reference to the local persistent knowledge base' indicate creation and modification of data in a SQLite database.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs kb_add 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_add, this is the rule to start with:

kb_add Rate-limited

kb_add stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "kb_add": {
      "limits": [
        {
          "counter": "kb_add_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT 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_add call is checked against it from then on.

FAQ

Questions about kb_add

What does the kb_add tool do? +

Save a fact, lesson, decision, or reference to the local persistent knowledge base. It is categorised as a Write tool in the Persistent Kb MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on kb_add? +

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

kb_add is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit kb_add? +

Yes. Add a rate_limit block to the kb_add 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_add completely? +

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

kb_add 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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