Read file contents. ⚠️ CONTEXT WARNING: Truncates at 500 lines. For large files or targeted access, PREFER these surgical alternatives:\n• read_file_lines - Read specific line ranges (use offset: -50 for last 50 lines)\n• search_in_file - Find patterns with context lines\n• edit_block - Search/re...
AI agents call read_file to retrieve information from OODA Computer Control without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves file data without creating, modifying, deleting, or executing anything. It has no persistent side effects on the system. Even though it operates in a computer control context with powerful sibling tools, read_file itself is purely informational. The low severity reflects minimal blast radius—misuse would only expose existing data, not alter or destroy it.
From the tool's definition Tool name 'read_file' and description 'Read file contents' indicate data retrieval with no modification or side effects. The warning about truncation and recommendations for alternatives all confirm read-only operation.
Documented attack patterns abuse exactly the kind of access read_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OODA Computer Control, and nothing reaches the server without passing your rules. This is the rule we recommend for read_file:
{
"version": "1",
"default": "deny",
"tools": {
"read_file": {}
}
}read_file is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read file contents. ⚠️ CONTEXT WARNING: Truncates at 500 lines. For large files or targeted access, PREFER these surgical alternatives:\n• read_file_lines - Read specific line ranges (use offset: -50 for last 50 lines)\n• search_in_file - Find patterns with context lines\n• edit_block - Search/replace without full read\nFull file reads consume context rapidly. Be surgical. It is categorised as a Read tool in the OODA Computer Control MCP Server, which means it retrieves data without modifying state.
Register the OODA Computer Control 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 OODA Computer Control. 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 OODA Computer Control MCP server (mnehmos/mnehmos.ooda.mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from OODA Computer Control, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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99 OODA Computer Control tools catalogued and risk-classified — across an index of 43,000+ MCP servers.