Read a file with line numbers (max 10MB)
AI agents call read_file to retrieve information from Mcp Toolkit without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves file content without altering data or triggering external operations. The 10MB size limit and line-number feature are standard read-only enhancements. No destructive, financial, or executable actions are possible.
From the tool's definition Tool name is 'read_file' and description states 'Read a file with line numbers (max 10MB)' — clearly a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Read a file with line numbers (max 10MB). It is categorised as a Read tool in the Mcp Toolkit MCP Server, which means it retrieves data without modifying state.
Register the Mcp Toolkit MCP server in PolicyLayer and add a rule for read_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 Mcp Toolkit. Nothing to install.
read_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 read_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 read_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.
read_file is provided by the Mcp Toolkit MCP server (studiopig/mcp-toolkit). 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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