List memories with optional filtering by source, tags, or date range. No semantic search — returns raw filtered results.
AI agents call recall to retrieve information from Open Brain MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The recall tool retrieves and filters existing memories from the knowledge base based on specified criteria (source, tags, date range). This is a pure read operation—it queries data without modifying, deleting, or executing any external code. The absence of words like 'delete,' 'update,' 'create,' 'execute,' or 'remove' confirms its read-only nature.
From the tool's definition Tool description states it 'List memories with optional filtering' and 'returns raw filtered results.' The verb 'List' combined with 'filtering' and 'retrieval' indicates data query/retrieval operations with no side effects.
Attacks that exploit this kind of access
List memories with optional filtering by source, tags, or date range. No semantic search — returns raw filtered results. It is categorised as a Read tool in the Open Brain MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Open Brain MCP Server MCP server in PolicyLayer and add a rule for recall: 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 Open Brain MCP Server. Nothing to install.
recall 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 recall 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 recall. 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.
recall is provided by the Open Brain MCP Server MCP server (subwizzll/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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