Stream similarity analysis between a target note and all other notes
AI agents call streaming-similarity to retrieve information from MCP Index Notes without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and analyzes relationships between notes via similarity scoring. It has no side effects: it does not create, modify, or delete notes; does not execute arbitrary code; and does not move money. It is a read-only analytical operation that discovers semantic connections, consistent with other analysis tools on this server (analysis-recommend-related, analysis-extract-entities).
From the tool's definition Tool performs 'similarity analysis' and 'stream[s]' results between notes — a query operation that retrieves and compares data without modifying, deleting, or executing external operations. The verb 'stream' indicates data retrieval/output, not mutation.
Attacks that exploit this kind of access
Stream similarity analysis between a target note and all other notes. It is categorised as a Read tool in the MCP Index Notes MCP Server, which means it retrieves data without modifying state.
Register the MCP Index Notes MCP server in PolicyLayer and add a rule for streaming-similarity: 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 Index Notes. Nothing to install.
streaming-similarity 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 streaming-similarity 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 streaming-similarity. 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.
streaming-similarity is provided by the MCP Index Notes MCP server (vjsr007/mcp-index-notes). 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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