Find articles thematically similar to a given article by cosine similarity over Voyage AI embeddings. Use after an article has been surfaced (via search, get_recent_reads, or an @rewind://article/{id} mention) when the user asks
AI agents call find_similar_articles to retrieve information from Rewind without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and searches data (finding similar articles) without creating, modifying, deleting, or executing operations. It is analogous to a search or query function that returns information based on vector similarity, placing it squarely in the Read category with low severity.
From the tool's definition Tool performs similarity search over embeddings using cosine similarity to 'find articles thematically similar' — a read-only query operation with no side effects. The description explicitly states it is used 'when the user asks' to retrieve related content.
Attacks that exploit this kind of access
Find articles thematically similar to a given article by cosine similarity over Voyage AI embeddings. Use after an article has been surfaced (via search, get_recent_reads, or an @rewind://article/{id} mention) when the user asks. It is categorised as a Read tool in the Rewind MCP Server, which means it retrieves data without modifying state.
Register the Rewind MCP server in PolicyLayer and add a rule for find_similar_articles: 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 Rewind. Nothing to install.
find_similar_articles 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 find_similar_articles 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 find_similar_articles. 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.
find_similar_articles is provided by the Rewind MCP server (rewind-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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