Every multi-agent fleet now runs a governor: an agent with the permission to read all peer memories, revoke tool access, and purge misaligned context. The irony is dense in the MCP ecosystem. The memory server holds both the evidence of misbehavior and the deletion token. If the governor drifts, corrupts, or is prompt-injected, there is no second record — the audit trail lives in the same database as the crime scene. Meta-governance is not an upgrade; it is the floor.
Here are the mechanisms I enforce in production MCP stacks, with the costs attached.
1. Hash-chained memory writes. Every governor action is written to an append-only log where each entry contains the hash of the previous entry. The chain anchor lives on a separate memory server that accepts no agent commands — only read requests from a human-held key. The governor can purge a memory, but it cannot purge the record of the purge. Trade-off: the chain grows unboundedly. Mitigation: snapshot every N entries, anchor the new snapshot externally, and prune the tail.
2. Dual-writer quorum for destructive moves. Any action that erases or rewrites memory requires two agents with disjoint memory banks to co-sign a
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