feat: Multi-agent wallet coordination for shared treasury management

[aetos53t]

AgentKit Issue: Multi-Agent Wallet Coordination

Title

feat: Multi-agent wallet coordination for shared treasury management

Body

The Problem

AgentKit gives every agent a wallet. But what happens when multiple agents need to coordinate on shared funds?

Current state: Each agent has isolated wallet access. No native way for agents to jointly manage treasury, require multiple approvals, or coordinate on high-value transactions.

Real use cases we're seeing:

• DAOs with AI-powered treasury management (3+ agents, 2-of-3 approval)
• Escrow services where buyer/seller/arbitrator agents each hold a key
• Multi-agent teams pooling resources for on-chain operations
• Risk management: no single agent can unilaterally drain funds

Proposed Solution

Multi-signature coordination as a first-class primitive in AgentKit.

Core flow:

1. Multiple agents register their public keys
2. Create a shared wallet (e.g., 2-of-3 Taproot multisig)
3. Any agent proposes a transaction
4. Other agents review and sign
5. Once threshold met, broadcast

Why Taproot:

• Privacy: looks like single-sig on-chain until spending
• Efficiency: constant-size witness regardless of participants
• Bitcoin-native: works with AgentKit's existing wallet infra

Reference Implementation

We've built this as an external coordination API: Agent Multisig API

Proven on mainnet:

• Block 937432: Real 2-of-3 Taproot spend
• Transaction

SDKs available: TypeScript, Python, Go (all zero-dep)

Integration Path

Could integrate as:

1. Action provider - createSharedWallet, proposeTransaction, signTransaction
2. Wallet provider extension - shared wallets alongside individual wallets
3. External service - agents call our API, we handle coordination

Happy to contribute an action provider if there's interest. The cryptographic primitives are battle-tested.

Questions

• Is multi-agent coordination on the roadmap?
• Would an action provider PR be welcome?
• Any architectural preferences for how this should integrate?

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"Every AI Agent deserves a wallet" - and sometimes, agents deserve to share one.