Look up a Linear organization member by their email address
AI agents call linear_get_user_by_email 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 user information from a Linear organization based on an email address. It performs a read-only query without creating, modifying, deleting, or executing anything. The blast radius is minimal—exposure allows an attacker to discover which email addresses are members of a Linear organization, which is low-sensitivity organizational metadata.
From the tool's definition Tool name 'linear_get_user_by_email' and description 'Look up a Linear organization member by their email address' indicate a query/lookup operation with no side effects.
Documented attack patterns abuse exactly the kind of access linear_get_user_by_email 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 linear_get_user_by_email:
{
"version": "1",
"default": "deny",
"tools": {
"linear_get_user_by_email": {}
}
}linear_get_user_by_email is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Look up a Linear organization member by their email address. 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 linear_get_user_by_email: 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.
linear_get_user_by_email 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 linear_get_user_by_email 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 linear_get_user_by_email. 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.
linear_get_user_by_email 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.