High Risk →

resolve_blobs

Resolve blob: URLs to downloadable base64 data. Blob URLs are temporary browser objects (common in Telegram, WhatsApp, Discord) that cannot be downloaded directly. This tool converts them to base64 data URIs.

How to control resolve_blobs ↓

AI agents invoke resolve_blobs to trigger actions in Camofox. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

High Risk

This tool executes a browser action to resolve ephemeral blob: URLs into base64-encoded data, effectively extracting binary content from browser memory. It is not a simple read (it requires executing browser-side logic to resolve the blob), nor is it destructive. The Execute category fits best given it triggers a browser operation.

From the tool's definition 'Resolve blob: URLs to downloadable base64 data' and 'converts them to base64 data URIs' — triggers browser-side resolution of temporary blob objects, executing a browser operation to extract and transform in-memory data

Documented attack patterns abuse exactly the kind of access resolve_blobs gives an agent:

PolicyLayer is an MCP gateway — it sits between your AI agents and Camofox, and nothing reaches the server without passing your rules. This is the rule we recommend for resolve_blobs:

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "resolve_blobs": {
      "limits": [
        {
          "counter": "resolve_blobs_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

resolve_blobs stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

  1. Create a free account and register Camofox — nothing to install.
  2. Add this policy — paste it, or build it visually.
  3. Point your MCP client (Claude, Cursor, anything) at your gateway URL.
RATE-LIMIT THIS TOOL →

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Go deeper

What does the resolve_blobs tool do? +

Resolve blob: URLs to downloadable base64 data. Blob URLs are temporary browser objects (common in Telegram, WhatsApp, Discord) that cannot be downloaded directly. This tool converts them to base64 data URIs. It is categorised as a Execute tool in the Camofox MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on resolve_blobs? +

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

What risk level is resolve_blobs? +

resolve_blobs is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit resolve_blobs? +

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

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

resolve_blobs is provided by the Camofox MCP server (redf0x1/camofox-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Camofox tool call.

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47 Camofox tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

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