Get all callback subscriptions for the business, optionally filtered by type
AI agents call pex_list_callback_subscriptions to retrieve information from PEX MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a Read operation that retrieves callback subscription configuration data. It has medium severity rather than low because callback subscriptions may reveal sensitive integration points, webhook URLs, or event notification settings that could be leveraged for reconnaissance or social engineering, but there are no immediate side effects from querying this information.
From the tool's definition Tool name contains 'list' and 'get'; description states 'Get all callback subscriptions' with no modification, creation, or deletion capability. Returns data only.
Attacks that exploit this kind of access
Get all callback subscriptions for the business, optionally filtered by type. It is categorised as a Read tool in the PEX MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PEX MCP Server MCP server in PolicyLayer and add a rule for pex_list_callback_subscriptions: 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 PEX MCP Server. Nothing to install.
pex_list_callback_subscriptions 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 pex_list_callback_subscriptions 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 pex_list_callback_subscriptions. 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.
pex_list_callback_subscriptions is provided by the PEX MCP Server MCP server (pexcard/mcp). 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.
Teams ship this data inside their own products. See what a licence covers →