sentinel_upload_chunk · SentinelX Core MCP: Risk & Policy

WHAT IT DOES

What sentinel_upload_chunk does on SentinelX Core MCP

AI agents use sentinel_upload_chunk 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_chunk needs a policy

This tool creates or modifies data by uploading file chunks to a remote SentinelX instance. While it is part of a reversible upload process (chunks can be discarded or overwritten), uploading chunks represents data modification rather than read-only access. It does not execute arbitrary code, delete data irreversibly, or move money.

From the tool's definition Tool name 'sentinel_upload_chunk' and description 'Upload one chunk through SentinelX (/upload/chunk)' indicate file upload functionality.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sentinel_upload_chunk Rate-limited

sentinel_upload_chunk 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_chunk": {
      "limits": [
        {
          "counter": "sentinel_upload_chunk_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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_chunk

What does the sentinel_upload_chunk tool do? +

Upload one chunk through SentinelX (/upload/chunk). 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_chunk? +

Register the SentinelX Core MCP server in PolicyLayer and add a rule for sentinel_upload_chunk: 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_chunk? +

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

Can I rate-limit sentinel_upload_chunk? +

Yes. Add a rate_limit block to the sentinel_upload_chunk 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_chunk completely? +

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

sentinel_upload_chunk 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.