read_document_at_snapshot
AI agents call read_document_at_snapshot to retrieve information from Mnemosyne MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite the empty description, the tool name clearly indicates a read operation (retrieval of document data at a specific snapshot/version). There are no indications of modification, deletion, or code execution. The low severity reflects that reads pose minimal risk compared to write or destructive operations.
From the tool's definition Tool name 'read_document_at_snapshot' contains the verb 'read' which indicates data retrieval without modification. The 'snapshot' qualifier suggests accessing a historical or point-in-time version of a document, consistent with read-only operations.
Attacks that exploit this kind of access
read_document_at_snapshot. It is categorised as a Read tool in the Mnemosyne MCP MCP Server, which means it retrieves data without modifying state.
Register the Mnemosyne MCP server in PolicyLayer and add a rule for read_document_at_snapshot: 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 Mnemosyne MCP. Nothing to install.
read_document_at_snapshot 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 read_document_at_snapshot 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 read_document_at_snapshot. 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.
read_document_at_snapshot is provided by the Mnemosyne MCP server (sophia-labs/mnemosyne-mcp). 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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