Medium Risk

register_media

Register and protect media on the Sidearm platform. Modes: register (provenance signing only), search_ready (register + vector indexing), standard (search_ready + watermarks + AI-training poison), maximum (standard + style cloaking + adversarial hardening). Returns the created media object.

Part of the Sidearm server.

register_media can modify Sidearm data, with no limits today. PolicyLayer puts allow, deny, and rate-limit rules on every call. Live in minutes.

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AI agents use register_media to create or modify resources in Sidearm. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

Without a policy, an AI agent could call register_media repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Sidearm.

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "register_media": {
      "limits": [
        {
          "counter": "register_media_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

See the full Sidearm policy for all 19 tools.

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These attack patterns abuse exactly the kind of access register_media gives an agent. Each links to the full case and the policy that stops it:

Browse the full MCP Attack Database →

Every attack above starts with a tool call. PolicyLayer checks each one against your policy first, so register_media only ever does what you allow.

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Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.

What does the register_media tool do? +

Register and protect media on the Sidearm platform. Modes: register (provenance signing only), search_ready (register + vector indexing), standard (search_ready + watermarks + AI-training poison), maximum (standard + style cloaking + adversarial hardening). Returns the created media object.. It is categorised as a Write tool in the Sidearm MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on register_media? +

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

What risk level is register_media? +

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

Can I rate-limit register_media? +

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

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

register_media is provided by the Sidearm MCP server (sidearmdrm/sidearm). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sidearm tool call.

Deterministic rules across all 19 Sidearm tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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4,600+ MCP servers and 31,000+ tools scanned and risk-classified.

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