AI agents call get_agent_signup_info to retrieve information from Posterly without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns instructional/informational content about signup workflows and safety boundaries. It performs no side effects, does not modify data, and does not execute external operations—it is purely an informational read operation. The low severity reflects minimal blast radius if misused.
From the tool's definition Tool name 'get_agent_signup_info' and description 'Explain how to use Posterly MCP for agent-led signup' indicate retrieval and explanation of informational content about signup procedures, with no data modification or external operations triggered.
Attacks that exploit this kind of access
Explain how to use Posterly MCP for agent-led signup before an API key exists, including the safe human-in-the-browser boundaries. It is categorised as a Read tool in the Posterly MCP Server, which means it retrieves data without modifying state.
Register the Posterly MCP server in PolicyLayer and add a rule for get_agent_signup_info: 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 Posterly. Nothing to install.
get_agent_signup_info 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_agent_signup_info 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_agent_signup_info. 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_agent_signup_info is provided by the Posterly MCP server (posterly-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
get_agent_signup_info is one line of Posterly's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →