AI agents call render_list_env_vars to retrieve information from UnClick without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
api_key | string | — | |
service_id | string | Yes |
Parameters from the server's own tool schema.
This tool retrieves environment variables from a Render service, which is a read-only operation (no side effects or data modification). However, environment variables often contain sensitive information such as API keys, database credentials, authentication tokens, and other secrets. Unauthorized access to these would enable further attacks or privilege escalation.
From the tool's definition Tool name: 'render_list_env_vars'; description: 'List environment variables for a Render service.' The verb 'List' indicates a read operation that retrieves data without modification.
Risk signalsHandles credentials or secrets (api_key)
Attacks that exploit this kind of access
List environment variables for a Render service. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
render_list_env_vars accepts 2 parameters: api_key, service_id. Required: service_id. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for render_list_env_vars: 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 UnClick. Nothing to install.
render_list_env_vars 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 render_list_env_vars 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 render_list_env_vars. 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.
render_list_env_vars is provided by the UnClick MCP server (@unclick/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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