reindex_vault_tool · Alaya MCP: Risk & Policy

WHAT IT DOES

What reindex_vault_tool does on Alaya

AI agents invoke reindex_vault_tool to trigger actions in Alaya. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why reindex_vault_tool needs a policy

This tool executes an indexing operation against a LanceDB vector database. It is not a simple read, nor does it delete data, but it runs a potentially expensive background process that modifies the index state. The incremental mode suggests it can also run in full-reindex mode, which could be disruptive. It falls under Execute as it triggers an external operation whose effects depend on the vault's current state.

From the tool's definition "Update the LanceDB vector index" and "Uses incremental mode by default (skips unchanged files)" — triggers an indexing/reindexing operation on an external data store

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

reindex_vault_tool Rate-limited

reindex_vault_tool stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "reindex_vault_tool": {
      "limits": [
        {
          "counter": "reindex_vault_tool_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Alaya, so you can run agents against it safely.

FAQ

Questions about reindex_vault_tool

What does the reindex_vault_tool tool do? +

Update the LanceDB vector index. Uses incremental mode by default (skips unchanged files). It is categorised as a Execute tool in the Alaya MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on reindex_vault_tool? +

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

What risk level is reindex_vault_tool? +

reindex_vault_tool is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit reindex_vault_tool? +

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

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

reindex_vault_tool is provided by the Alaya MCP server (luke-kucing/alaya). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.