Fetch a stub document by id and return full text
AI agents call fetch to retrieve information from MCP Server Starter without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The fetch operation is read-only: it queries a document by identifier and returns its content. There are no side effects, no data modification, deletion, or code execution. This is a straightforward data retrieval operation with minimal risk if misused by an agent, as it only exposes existing documents.
From the tool's definition 'Fetch a stub document by id and return full text' — the tool retrieves and returns document content without modifying, deleting, or executing operations.
Attacks that exploit this kind of access
Fetch a stub document by id and return full text. It is categorised as a Read tool in the MCP Server Starter MCP Server, which means it retrieves data without modifying state.
Register the MCP Server Starter MCP server in PolicyLayer and add a rule for fetch: 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 Server Starter. Nothing to install.
fetch 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 fetch 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 fetch. 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.
fetch is provided by the MCP Server Starter MCP server (lassiterj/mcp-playground). 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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