# 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.

Agent View of the PolicyLayer registry record for `add_document_attachment`. HTML page: https://policylayer.com/tools/dugynoo-huly-mcp/add-document-attachment

## Facts

- Tool: `add_document_attachment`
- Server: Huly (`dugynoo/huly-mcp`) — https://policylayer.com/tools/dugynoo-huly-mcp.md
- Homepage: https://github.com/dugynoo/huly-mcp
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "add_document_attachment",
    "arguments": {}
  }
}
```

## 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 own 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."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Huly:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_document_attachment": {
      "limits": [
        {
          "counter": "add_document_attachment_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Huly (217)

- `dedup_planner_todos` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/dedup-planner-todos.md
- `delete_attachment` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-attachment.md
- `delete_card` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-card.md
- `delete_channel` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-channel.md
- `delete_channel_message` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-channel-message.md
- `delete_comment` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-comment.md
- `delete_component` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-component.md
- `delete_dm_message` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-dm-message.md
- `delete_document` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-document.md
- `delete_event` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-event.md
- `delete_issue` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-issue.md
- `delete_issue_template` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-issue-template.md
- `delete_label` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-label.md
- `delete_milestone` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-milestone.md
- `delete_notification` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-notification.md
- `delete_organization` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-organization.md
- `delete_person` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-person.md
- `delete_project` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-project.md
- `delete_relation` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-relation.md
- `delete_tag_category` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-tag-category.md
- `delete_teamspace` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-teamspace.md
- `delete_test_case` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-case.md
- `delete_test_plan` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-plan.md
- `delete_test_result` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-result.md
- `delete_test_run` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-run.md
- `delete_test_suite` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-test-suite.md
- `delete_thread_reply` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-thread-reply.md
- `delete_workspace` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/delete-workspace.md
- `remove_issue_relation` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/remove-issue-relation.md
- `remove_organization_member` — Destructive — https://policylayer.com/tools/dugynoo-huly-mcp/remove-organization-member.md
- …and 187 more: https://policylayer.com/tools/dugynoo-huly-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=dugynoo-huly-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dugynoo-huly-mcp