AI agents call topic_map to retrieve information from Project Tessera without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and summarizes metadata about stored memories by generating a topic map. It has no side effects, does not execute external operations, does not modify or delete data, and does not move money. The operation is purely informational—extracting a structural view of indexed documents to help users understand memory organization and relationships.
From the tool's definition Tool description states 'Generate topic map of all memories' — a read-only operation that retrieves and visualizes data without modifying or deleting it.
Documented attack patterns abuse exactly the kind of access topic_map gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Project Tessera, and nothing reaches the server without passing your rules. This is the rule we recommend for topic_map:
{
"version": "1",
"default": "deny",
"tools": {
"topic_map": {}
}
}topic_map is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Generate topic map of all memories. It is categorised as a Read tool in the Project Tessera MCP Server, which means it retrieves data without modifying state.
Register the Project Tessera MCP server in PolicyLayer and add a rule for topic_map: 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 Project Tessera. Nothing to install.
topic_map 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 topic_map 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 topic_map. 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.
topic_map is provided by the Project Tessera MCP server (besslframework-stack/project-tessera). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Project Tessera, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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43 Project Tessera tools catalogued and risk-classified — across an index of 43,000+ MCP servers.