Get a single document by path
AI agents call get_document to retrieve information from Firebase MCP Server 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 query operation that retrieves data without modifying, deleting, or executing code. The operation is limited to the Firebase Emulator environment, further reducing risk. No data mutation or external effects occur.
From the tool's definition Tool description states 'Get a single document by path' - a retrieval operation with no side effects. Server description confirms it 'provides tools to navigate collections, retrieve documents' within an emulator environment.
Attacks that exploit this kind of access
Get a single document by path. It is categorised as a Read tool in the Firebase MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Firebase MCP Server MCP server in PolicyLayer and add a rule for get_document: 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 Firebase MCP Server. Nothing to install.
get_document 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 get_document 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 get_document. 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.
get_document is provided by the Firebase MCP Server MCP server (nigelthorne/firebase_mcp_server). 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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