Write or read a session handoff. At session end, write what was decided, what is pending, what changed. At session start, read the last handoff. The single most important continuity tool.
AI agents invoke session_handoff to trigger actions in Sovereign Stack. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
session_handoff triggers real processes with real consequences. An agent gone sideways doesn't fire it once — it starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.
Attacks that exploit this kind of access
Write or read a session handoff. At session end, write what was decided, what is pending, what changed. At session start, read the last handoff. The single most important continuity tool. It is categorised as a Execute tool in the Sovereign Stack MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Sovereign Stack MCP server in PolicyLayer and add a rule for session_handoff: 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 Sovereign Stack. Nothing to install.
session_handoff is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the session_handoff 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 session_handoff. 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.
session_handoff is provided by the Sovereign Stack MCP server (templetwo/sovereign-stack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.