add_document_attachment

Add an attachment to a Huly document. Convenience method that finds the document by teamspace and title/ID. Provide ONE of: filePath, fileUrl, or data.

SERVERHuly SOURCEdugynoo/huly-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/dugynoo-huly-mcp/add-document-attachment.md

WHAT IT DOES

What add_document_attachment does on Huly

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

RISK

Why add_document_attachment is rated Medium

This tool creates new attachment data and modifies a document by adding content to it. These are reversible operations (attachments can typically be removed), so it falls under Write rather than Destructive. The severity is medium because while file uploads could introduce malicious content or consume storage, the blast radius is limited to a single document and the action is reversible.

From the tool's definition Tool name is 'add_document_attachment' and description states 'Add an attachment to a Huly document,' indicating it creates/modifies data by attaching files to an existing document. The tool accepts file inputs (filePath, fileUrl, or data) and persists them.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add_document_attachment safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Huly, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For add_document_attachment, this is the rule to start with:

add_document_attachment Rate-limited

add_document_attachment 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": {
    "add_document_attachment": {
      "limits": [
        {
          "counter": "add_document_attachment_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Huly, apply this rule, and every add_document_attachment call is checked against it from then on.

FAQ

Questions about add_document_attachment

What does the add_document_attachment tool do? +

Add an attachment to a Huly document. Convenience method that finds the document by teamspace and title/ID. Provide ONE of: filePath, fileUrl, or data. It is categorised as a Write tool in the Huly MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_document_attachment? +

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

What risk level is add_document_attachment? +

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

Can I rate-limit add_document_attachment? +

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

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

add_document_attachment is provided by the Huly MCP server (dugynoo/huly-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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