High-risk tools in Mcacp
3 of the 24 tools in Mcacp are classified as high risk. This page profiles those tools specifically, with recommended policy actions and the attack patterns that target them.
Every operation listed below is an action PolicyLayer recommends controlling at the transport layer. Open any tool to see the full profile, risk score, and YAML policy snippet.
Tools at high risk
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initializeExecute 3/5Spawn an ACP agent process and perform the initialize handshake. Must be called before creating sessions.
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new_sessionExecute 4/5Create a new ACP session on an initialized agent. Returns the agent's session ID.
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prompt_startExecute 3/5Send a prompt to an active ACP session. Returns immediately with { status: "prompted" }. Use prompt or prompt_events to consume events.
Attacks that target this class
High-risk tools in any server share these documented attack patterns. Each links to the full case and the defensive policy.
More on Mcacp
Enforce policy on Mcacp
One command generates a policy scaffold for every server in your MCP config.
npx -y @policylayer/intercept init