Reads a specific global rule file by name from ~/.claude/rules/{name}.md. Args: - rule_name (string): Rule name without .md (e.g.
AI agents call rules_get_global_rule to retrieve information from Claude Rules 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 straightforward read operation that retrieves rule file content from a predictable filesystem location (~/.claude/rules/). There is no modification, execution, deletion, or financial impact. The blast radius is minimal—an AI agent can only access existing rule files, not alter or execute them.
From the tool's definition Tool description states it 'Reads a specific global rule file' and the verb 'Reads' combined with retrieval of rule content indicates data querying with no side effects. Args show a simple name parameter for file selection.
Attacks that exploit this kind of access
Reads a specific global rule file by name from ~/.claude/rules/{name}.md. Args: - rule_name (string): Rule name without .md (e.g. It is categorised as a Read tool in the Claude Rules MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Claude Rules MCP Server MCP server in PolicyLayer and add a rule for rules_get_global_rule: 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 Claude Rules MCP Server. Nothing to install.
rules_get_global_rule 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 rules_get_global_rule 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 rules_get_global_rule. 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.
rules_get_global_rule is provided by the Claude Rules MCP Server MCP server (jeremykenedy/claude-rules-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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