kage_structural_index

Build the complete cache-backed structural index for large repos. This covers all supported source/config/doc files and writes .agent_memory/structural artifacts separate from learned memory.

ServerKage
CategoryWrite

How to control kage_structural_index ↓

WHAT IT DOES

What kage_structural_index does on Kage

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

THE RISK

Medium Risk

Why kage_structural_index needs a policy

This tool constructs and writes a structural index to disk (.agent_memory/structural artifacts). It creates/modifies files in the repository, making it a Write operation. It is not Destructive since it builds/caches rather than deletes, and not Execute since it doesn't run arbitrary code or commands.

From the tool's definition 'writes .agent_memory/structural artifacts' and 'Build the complete cache-backed structural index'

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

POLICY

How to control kage_structural_index

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_structural_index:

policy.json

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

kage_structural_index 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 →

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EXPLORE

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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_structural_index

What does the kage_structural_index tool do? +

Build the complete cache-backed structural index for large repos. This covers all supported source/config/doc files and writes .agent_memory/structural artifacts separate from learned memory. 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_structural_index? +

Register the Kage MCP server in PolicyLayer and add a rule for kage_structural_index: 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_structural_index? +

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

Can I rate-limit kage_structural_index? +

Yes. Add a rate_limit block to the kage_structural_index 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_structural_index completely? +

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

kage_structural_index 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.

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