upload_document · MCP Knowledge Base Server MCP

WHAT IT DOES

What upload_document does on MCP Knowledge Base Server

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

WHY IT NEEDS A POLICY

Why upload_document needs a policy

Uploading a document creates new data in the knowledge base without destructive consequences. It is reversible and does not execute code, trigger external side effects beyond storage, or move money. This maps cleanly to the Write category.

From the tool's definition Tool name is 'upload_document' and description states 'Upload a document to the knowledge base'. This creates/adds new data to the knowledge base, which is reversible (documents can be deleted via the sibling 'delete_document' tool).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_document Rate-limited

upload_document 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": {
    "upload_document": {
      "limits": [
        {
          "counter": "upload_document_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about upload_document

What does the upload_document tool do? +

Upload a document to the knowledge base. It is categorised as a Write tool in the MCP Knowledge Base Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on upload_document? +

Register the MCP Knowledge Base Server MCP server in PolicyLayer and add a rule for upload_document: 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 MCP Knowledge Base Server. Nothing to install.

What risk level is upload_document? +

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

Can I rate-limit upload_document? +

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

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

upload_document is provided by the MCP Knowledge Base Server MCP server (maxsmosarski/mcp-knowledge-base). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.