AI agents call get_variable_group to retrieve information from Yunxiao without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
appName | string | Yes | Application name. Use list_applications to discover valid app names. |
organizationId | string | — | Yunxiao organization ID. When omitted, the server uses the user's default organization. |
variableGroupName | string | Yes | Variable group name. Use get_app_variable_groups to discover valid names. |
Parameters from the server's own tool schema.
This tool queries and retrieves configuration data (variable groups) for deployment environments. It performs no side effects, modifications, deletions, or external operations. The action is purely informational—reading existing configuration. This is a classic Read category operation with low severity risk, as misuse would only expose configuration data rather than cause destructive or financial harm.
From the tool's definition Tool name 'get_variable_group' and description 'Get an AppStack variable group by name' indicate a retrieval operation. The phrase 'Variable groups contain key-value configuration pairs' confirms this retrieves configuration data without modification.
Attacks that exploit this kind of access
Get an AppStack variable group by name. Variable groups contain key-value configuration pairs for deployment environments. It is categorised as a Read tool in the Yunxiao MCP Server, which means it retrieves data without modifying state.
get_variable_group accepts 3 parameters: appName, organizationId, variableGroupName. Required: appName, variableGroupName. The full parameter table on this page comes from the server's own tool schema.
Register the Yunxiao MCP server in PolicyLayer and add a rule for get_variable_group: 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 Yunxiao. Nothing to install.
get_variable_group 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 get_variable_group 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 get_variable_group. 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.
get_variable_group is provided by the Yunxiao MCP server (@futuretea/yunxiao-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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