// SCAN REPORT

Persistent Kb

5 tools. 2 can modify or destroy data without limits.

2 write tools that can modify data. Rate limits recommended.

Last updated: 2 Jul 2026

2 can modify or destroy data

3 read-only

5 tools total

Community server · catalogue entry checked 02/07/2026

How to control Persistent Kb ↓

TOOL MAP

What Persistent Kb exposes to your agents

Read (3) Write / Execute (2) Destructive / Financial (0)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

High Risk

The most dangerous Persistent Kb tools

Write · Low kb_tag This tool modifies existing data (tags on entries) but does not delete entries or execute code. Write · Low kb_add This tool creates or adds new entries to a knowledge base, which is a reversible write operation.

2 of Persistent Kb's 5 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control Persistent Kb

PolicyLayer is an MCP gateway — it sits between your AI agents and Persistent Kb, and nothing reaches the server without passing your rules. These are the rules we recommend:

Rate limit write operations

{
  "kb_add": {
    "limits": [
      {
        "counter": "kb_add_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "kb_list": {
    "limits": [
      {
        "counter": "kb_list_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register Persistent Kb — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON PERSISTENT KB →

Instant setup, no code required.

FULL CATALOGUE

All 5 Persistent Kb tools

WRITE 2 tools

Write kb_add Save a fact, lesson, decision, or reference to the local persistent knowledge base. Write kb_tag Add or remove tags on an existing entry.

READ 3 tools

Read kb_list List recent entries with optional filters by kind, tag, or date. Read kb_search Full-text search over the persistent knowledge base via SQLite FTS5. Read kb_show Retrieve a single entry

EXPLORE

Related servers

Other MCP servers with similar tools — same risk classification, starter policies for each.

FAQ

Questions about Persistent Kb

How do I prevent bulk modifications through Persistent Kb? +

The Persistent Kb server has 2 write tools including kb_add, kb_tag. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach Persistent Kb.

How many tools does the Persistent Kb MCP server expose? +

5 tools across 3 categories: Destructive, Read, Write. 3 are read-only. 2 can modify, create, or delete data.

How do I enforce a policy on Persistent Kb? +

Register the Persistent Kb MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every Persistent Kb tool call.

Deterministic rules across all 5 Persistent Kb tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON PERSISTENT KB →

Instant setup, no code required.

5 Persistent Kb tools catalogued and risk-classified — across an index of 46,500+ MCP servers.

// WHERE THIS COMES FROM

These policies come from Persistent Kb's registry record.

The record behind this page: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →