kv_get

THE RISK

Low Risk

Why kv_get needs a policy

This tool retrieves stored key-value data without modifying, deleting, or executing code. It has no side effects beyond reading data from storage. The low severity reflects minimal blast radius—misuse would only expose existing data, not alter or destroy it.

From the tool's definition Tool name 'kv_get' and description 'Retrieve key-value pair(s) from a space' indicate data retrieval only. The mention of 'pattern matching with wildcards' is a query feature, not a modification capability.

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

POLICY

How to control kv_get

PolicyLayer is an MCP gateway — it sits between your AI agents and Codehooks Io MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for kv_get:

policy.json

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

kv_get is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Codehooks Io MCP Server tools

Destructive drop_collection Delete a collection Destructive drop_index Remove field(s) from a query index Destructive file_delete Delete a file from server Destructive kv_del Delete key-value pair in a space. Destructive remove_schema Remove JSON schema from a collection Write uncap_collection Remove cap from a collection Write add_schema Add a JSON schema to a collection. Provide the schema content as a JSON string. Write cap_collection Cap a collection

All 20 Codehooks Io MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about kv_get

What does the kv_get tool do? +

Retrieve key-value pair(s) from a space. Supports pattern matching with wildcards. It is categorised as a Read tool in the Codehooks Io MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on kv_get? +

Register the Codehooks Io MCP Server MCP server in PolicyLayer and add a rule for kv_get: 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 Codehooks Io MCP Server. Nothing to install.

What risk level is kv_get? +

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

Can I rate-limit kv_get? +

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

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

kv_get is provided by the Codehooks Io MCP Server MCP server (restdb/codehooks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Codehooks Io MCP Server tool call.

Start from Codehooks Io MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →