AI agents call github_list_repositories to retrieve information from Sage MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves/enumerates data about repositories accessible to the authenticated user. It performs a read-only query operation with no ability to modify, delete, or execute actions. The severity is low because listing repositories exposes repository metadata but does not enable changes or resource consumption beyond the query itself.
From the tool's definition Tool name contains 'list' and description states 'List repositories for the authenticated user' — a query operation with no side effects.
Documented attack patterns abuse exactly the kind of access github_list_repositories gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sage MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for github_list_repositories:
{
"version": "1",
"default": "deny",
"tools": {
"github_list_repositories": {}
}
}github_list_repositories is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List repositories for the authenticated user. It is categorised as a Read tool in the Sage MCP MCP Server, which means it retrieves data without modifying state.
Register the Sage MCP server in PolicyLayer and add a rule for github_list_repositories: 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 Sage MCP. Nothing to install.
github_list_repositories 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 github_list_repositories 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 github_list_repositories. 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.
github_list_repositories is provided by the Sage MCP server (sagemcp/sagemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 359 Sage MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.