sentinel_upload_init · SentinelX Core MCP: Risk & Policy

WHAT IT DOES

What sentinel_upload_init does on SentinelX Core MCP

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

WHY IT NEEDS A POLICY

Why sentinel_upload_init needs a policy

This tool initiates a file upload sequence (chunked upload pattern), which is a reversible write operation that modifies system state by creating an upload session. It does not delete data (not Destructive), execute arbitrary code (not Execute in the dangerous sense), or move money (not Financial).

From the tool's definition Tool name 'sentinel_upload_init' and description 'Initialize a chunked upload through SentinelX (/upload/init)' indicate file upload initialization, which creates or modifies data by preparing a file transfer operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sentinel_upload_init Rate-limited

sentinel_upload_init 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.

View as policy code

policy.json

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

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Instant setup, no code required.

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

FAQ

Questions about sentinel_upload_init

What does the sentinel_upload_init tool do? +

Initialize a chunked upload through SentinelX (/upload/init). It is categorised as a Write tool in the SentinelX Core MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sentinel_upload_init? +

Register the SentinelX Core MCP server in PolicyLayer and add a rule for sentinel_upload_init: 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 SentinelX Core MCP. Nothing to install.

What risk level is sentinel_upload_init? +

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

Can I rate-limit sentinel_upload_init? +

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

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

sentinel_upload_init is provided by the SentinelX Core MCP server (pensados/sentinelx-core-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.