kage_install_policy

THE RISK

Medium Risk

Why kage_install_policy needs a policy

The tool writes to a repository configuration file (AGENTS.md) to enforce agent behavior policies. This is a reversible modification (can be updated or reverted in subsequent commits), so it falls under Write rather than Destructive.

From the tool's definition 'Install or update the repo AGENTS.md policy' — this modifies configuration files that control agent behavior

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

POLICY

How to control kage_install_policy

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

policy.json

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

kage_install_policy 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.

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

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Kage tools

Destructive kage_context_slot_delete Delete a repo-local context slot by label. Destructive kage_compact Consolidate repo memory: prune dead citations, deprecate hard-stale packets, and surface n Execute kage_refresh Rebuild repo indexes, code graph, memory graph, metrics, and stale-memory metadata. Agents Write kage_graph_registry Build a signed graph-registry manifest for generated memory graph, code graph, indexes, me Write kage_structural_index Build the complete cache-backed structural index for large repos. This covers all supporte Write kage_observe Store an automatic local observation event from an agent session. Observations are privacy Write kage_capture Create a repo-local Kage memory packet immediately. Org/global promotion still requires ex Write kage_code_index Write external code index artifacts consumed by the code graph. Prefers SCIP when scip-typ

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Write 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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about kage_install_policy

What does the kage_install_policy tool do? +

Install or update the repo AGENTS.md policy that tells coding agents to use Kage automatically. It is categorised as a Write tool in the Kage MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on kage_install_policy? +

Register the Kage MCP server in PolicyLayer and add a rule for kage_install_policy: 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 Kage. Nothing to install.

What risk level is kage_install_policy? +

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

Can I rate-limit kage_install_policy? +

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

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

kage_install_policy is provided by the Kage MCP server (@kage-core/kage-graph-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Kage tool call.

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

CHECK YOUR STACK →