@agenticprimitives/account-custody

Part of Agentic Primitives — the open-source trust substrate for agentic applications: identity that can sign, authority checked at act time, evidence the owner carries. Developer kit · All packages

Custody is not authority.

Most stacks blur the two: the key that lets an agent act is also the key that controls the account, so a leaked session becomes a lost identity. This package exists to keep them apart. Credential add, replace, and remove on a Smart Agent are custody-policy operations — gated by trustee quorums, guardian quorums, multi-credential self-recovery, or multi-sig — and are never modeled as delegations (ADR-0011, spec 221). A delegated party can act within its caveats; it can never promote itself into custody.

The payoff is recovery without identity loss. CustodyAction.RecoverAccount performs an atomic add-new + remove-old credential rotation under the account's custody policy. The canonical Smart Agent address never changes; every delegation it ever issued stays valid; only the credential set moves. This package is the TypeScript surface for that machinery: the CustodyPolicy ABI, CustodyAction argument builders, EIP-712 typed data, quorum signature packing, and the custody-domain types.

Part of agenticprimitives — the trust substrate for the agent economy: one canonical Smart Agent identity with custody, delegation, naming, credentials, and audit evidence designed as one system.

Install

pnpm add @agenticprimitives/account-custody

Use

import {
  CustodyAction,
  buildRecoverAccountArgs,
  custodyDomain,
  packQuorumSigs,
} from '@agenticprimitives/account-custody';

What you get:

• custodyPolicyAbi — the ABI for the on-chain CustodyPolicy ERC-7579 module (packages/contracts/src/custody/CustodyPolicy.sol), kept in lockstep with the deployed bytecode.
• CustodyAction enum (a mirror of the on-chain enum) plus per-action buildXxxArgs encoders — including buildRecoverAccountArgs for credential rotation.
• EIP-712 typed-data shapes for ScheduleCustodyChangeRequest / ApplyCustodyChangeRequest / CancelScheduledChangeRequest, with custodyDomain({ chainId, verifyingContract }) — guaranteed to hash to the same structHash the Solidity computes.
• Quorum signature packing (packQuorumSigs) and custody-domain types: Custodian, Trustee, CustodyCouncil, ScheduledChange, CustodyMode, RiskTier.

How it's different

The common pattern for org control and recovery is a third-party multi-sig (Safe) plus a separate recovery product (Argent-style guardians) bolted onto an account they don't define. That works until the seams matter: the multi-sig's notion of "owner" and the recovery product's notion of "guardian" are different identity models, and neither knows about the delegations the account has issued. Here custody is a native ERC-7579 module on the same Smart Agent — quorums, trustees, scheduled changes, and recovery in one policy, designed alongside the delegation layer it explicitly firewalls (spec 213). No third-party multi-sig dependency; we ported the signature-packing patterns worth porting and own the rest.

Boundary

This package speaks custody vocabulary only:

• Custodian
• Trustee
• CustodyCouncil
• CustodyAction
• ScheduledChange

It does not own delegation caveats, MCP transport, passkey ceremonies, account deployment, or key-custody providers (note: key-custody is key custody — KMS backends; this is account custody). See CLAUDE.md for routing and spec.md for the contract.

Validate

pnpm --filter @agenticprimitives/account-custody typecheck
pnpm --filter @agenticprimitives/account-custody test

Status

Testnet/pilot-ready. Production launch is gated on the public checklist in the root README — including third-party contract audit and governance key rotation. Track every security finding live in docs/audits/findings.yaml.