Get the message thread between the bot and a specific identity
AI agents call get_thread to retrieve information from Mcp Ap2 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves existing message data without side effects. Although the server handles financial operations (AP2 — Google's Agent-to-Agent Payment Protocol), this specific tool only queries conversation history. The action is read-only, making it a Read category risk with low severity since it accesses historical messages that may contain sensitive information but causes no direct harm or state change.
From the tool's definition Tool name 'get_thread' and description 'Get the message thread between the bot and a specific identity' indicate retrieval of conversation history with no modification or execution of financial operations.
Documented attack patterns abuse exactly the kind of access get_thread gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for get_thread:
{
"version": "1",
"default": "deny",
"tools": {
"get_thread": {}
}
}get_thread is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the message thread between the bot and a specific identity. It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for get_thread: 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 Mcp Ap2. Nothing to install.
get_thread 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_thread 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_thread. 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_thread is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.