AI agents call knitbrain_retrieve to retrieve information from Knitbrain without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves previously stored/compressed data using a hash handle. It performs a read operation that queries and returns data without creating, modifying, deleting, or executing external operations. The description is somewhat truncated but clearly indicates a lookup/fetch operation typical of Read category tools.
From the tool's definition Tool description states 'Retrieve the exact original bytes for a ⟨recall:hash⟩ handle produced by compression.' The verb 'Retrieve' and context of fetching stored compressed data indicates data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Retrieve the exact original bytes for a ⟨recall:hash⟩ handle produced by compression. Use when a skeleton isn. It is categorised as a Read tool in the Knitbrain MCP Server, which means it retrieves data without modifying state.
Register the Knitbrain MCP server in PolicyLayer and add a rule for knitbrain_retrieve: 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 Knitbrain. Nothing to install.
knitbrain_retrieve 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 knitbrain_retrieve 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 knitbrain_retrieve. 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.
knitbrain_retrieve is provided by the Knitbrain MCP server (pdgit12/knitbrain). 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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