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screan

npm

Packages

Current Co-maintainers

Former Co-maintainers

6 packages

@countersign/ap2

Govern AP2 (the Agent Payments Protocol) with Countersign — guard an agent's mandate against policy before it signs the PaymentMandate.

@countersign/api-contract

Countersign Core API contract — typed REST + ws schema and OpenAPI spec for the cross-vendor agent-spend control plane.

@countersign/mcp

Countersign as MCP tools — the cross-vendor kill switch + spend guard inside any MCP client (Claude, Cursor, …).

@countersign/sdk

Countersign SDK — the typed client agents and operators use to wire in the cross-vendor freeze, spend-guard, and live audit ledger. Browser + Node.

@countersign/verify

Verify a Countersign ledger entry offline: hash-chain recomputation, RFC 6962 Merkle inclusion, and Ed25519 signatures — zero hosted dependencies.

@countersign/x402

Govern x402 (HTTP-402 machine payments) with Countersign — guard an agent's payment against policy before it pays.