AI agents call scf_get_evidence_file to retrieve information from Scf without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only retrieval operation on stored evidence. It queries file metadata and generates a temporary (15-minute) access URL—classic read semantics. No data is created, modified, destroyed, or executed. The pre-signed URL mechanism is a standard secure download pattern. Risk is low as misuse would only expose already-stored compliance evidence data.
From the tool's definition Tool retrieves metadata and provides a download URL for an existing evidence file; no creation, modification, or deletion occurs.
Attacks that exploit this kind of access
Get metadata and a pre-signed download URL (15-min expiry) for a single evidence file. Use to inspect or retrieve a specific uploaded artifact. It is categorised as a Read tool in the Scf MCP Server, which means it retrieves data without modifying state.
Register the Scf MCP server in PolicyLayer and add a rule for scf_get_evidence_file: 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 Scf. Nothing to install.
scf_get_evidence_file 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 scf_get_evidence_file 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 scf_get_evidence_file. 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.
scf_get_evidence_file is provided by the Scf MCP server (mcp-server-scf). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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