# preview_operation

Validate and preview an exact local named request. No authentication, provider validation or quota estimate. Raw asset previews reveal only byte count/hash.

Agent View of the PolicyLayer registry record for `preview_operation`. HTML page: https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/preview-operation

## Facts

- Tool: `preview_operation`
- Server: Bannerbear Mcp Cli (`@thenavidm/bannerbear-mcp-cli`) — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli.md
- Install: `npx -y @thenavidm/bannerbear-mcp-cli`
- Homepage: https://www.npmjs.com/package/@thenavidm/bannerbear-mcp-cli
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 2 (2 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `arguments` | object | yes |  |
| `operation` | string | yes |  |

Parameters from the server's own tool schema.

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

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "preview_operation",
    "arguments": {
      "arguments": {},
      "operation": "<operation>"
    }
  }
}
```

## Why preview_operation is rated Low

Even though preview_operation only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

## Use case

AI agents call preview_operation to retrieve information from Bannerbear Mcp Cli without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Bannerbear Mcp Cli:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "preview_operation": {}
  }
}
```

## Other tools on Bannerbear Mcp Cli (74)

- `delete_animation_template` — Destructive — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/delete-animation-template.md
- `delete_image_template` — Destructive — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/delete-image-template.md
- `delete_instant_url` — Destructive — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/delete-instant-url.md
- `delete_webhook` — Destructive — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/delete-webhook.md
- `delete_workflow` — Destructive — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/delete-workflow.md
- `remove_bg` — Destructive — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/remove-bg.md
- `run_workflow` — Execute — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/run-workflow.md
- `animate_template` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/animate-template.md
- `check_assets` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/check-assets.md
- `concat_videos` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/concat-videos.md
- `crop_video` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/crop-video.md
- `get_account` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-account.md
- `get_animation` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-animation.md
- `get_animation_template` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-animation-template.md
- `get_asset` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-asset.md
- `get_batch` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-batch.md
- `get_image` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-image.md
- `get_image_template` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-image-template.md
- `get_instant_url` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-instant-url.md
- `get_layer_schema` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-layer-schema.md
- `get_operation_schema` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-operation-schema.md
- `get_publication` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-publication.md
- `get_tool_job` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-tool-job.md
- `get_webhook` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-webhook.md
- `get_workflow` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-workflow.md
- `get_workflow_run` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/get-workflow-run.md
- `list_accounts` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/list-accounts.md
- `list_animation_templates` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/list-animation-templates.md
- `list_animations` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/list-animations.md
- `list_assets` — Read — https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli/list-assets.md
- …and 44 more: https://policylayer.com/tools/thenavidm-bannerbear-mcp-cli.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`

---

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