Resolve a media_id to a short-lived downloadable URL. The URL itself still requires the Bearer token to fetch.
AI agents call retrieve_media_url to retrieve information from Mcp Ap2 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves metadata (a URL) associated with a media identifier. Even though the URL requires authentication via Bearer token, the tool itself only performs a read/lookup operation without side effects. The short-lived nature of the URL and authentication requirement are security mitigations, not indications of higher risk category. This is purely a Read operation.
From the tool's definition Tool description states 'Resolve a media_id to a short-lived downloadable URL' — this is a retrieval operation that queries/resolves data to provide a URL. No data is created, modified, deleted, or financial action is taken.
Documented attack patterns abuse exactly the kind of access retrieve_media_url gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for retrieve_media_url:
{
"version": "1",
"default": "deny",
"tools": {
"retrieve_media_url": {}
}
}retrieve_media_url is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Resolve a media_id to a short-lived downloadable URL. The URL itself still requires the Bearer token to fetch. It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for retrieve_media_url: 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 Mcp Ap2. Nothing to install.
retrieve_media_url is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the retrieve_media_url 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.
Set action: deny in the PolicyLayer policy for retrieve_media_url. 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.
retrieve_media_url is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.