AI agents call read_code_file_lines to retrieve information from CodeSavant without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves specific lines from a code file without any side effects, side-channel operations, or modification capability. It is a straightforward read operation that queries data from a file, fitting the Read category definition. Severity is low since exposure of this tool poses minimal risk—the worst outcome is unauthorized information disclosure of code already stored on the system.
From the tool's definition Tool name contains 'read' and description states 'Read specific lines from a code file' with no modification or execution capability mentioned.
Documented attack patterns abuse exactly the kind of access read_code_file_lines gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CodeSavant, and nothing reaches the server without passing your rules. This is the rule we recommend for read_code_file_lines:
{
"version": "1",
"default": "deny",
"tools": {
"read_code_file_lines": {}
}
}read_code_file_lines is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read specific lines from a code file. It is categorised as a Read tool in the CodeSavant MCP Server, which means it retrieves data without modifying state.
Register the CodeSavant MCP server in PolicyLayer and add a rule for read_code_file_lines: 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 CodeSavant. Nothing to install.
read_code_file_lines 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_code_file_lines 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_code_file_lines. 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_code_file_lines is provided by the CodeSavant MCP server (twolven/mcp-codesavant). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from CodeSavant, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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7 CodeSavant tools catalogued and risk-classified — across an index of 43,000+ MCP servers.