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Changelog

All notable changes to the XAP protocol will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.3.0] — March 2026

Added

  • verity-receipt.json: Five new optional fields closing institutional-grade audit gaps:
    • timestamp_authority: RFC 3161 TSA token for independent temporal proof
    • rules_applied.policy_content_hash: SHA-256 of governing policy document
    • rules_applied.policy_url: Where to retrieve and verify the policy
    • key_id: Identifies the specific signing key for historical lookup
    • causality: Links receipt to its position in a multi-agent workflow chain
    • condition_results[].verifier_attestation: Cryptographic attestation from external probabilistic verifiers
  • policy-version.json: New schema for content-addressed XAP policy documents
  • agent-key-history.json: New schema for agent Ed25519 key rotation history
  • Three new example files

Migration

All new fields are optional. No existing receipt validation breaks. Systems that do not implement the new fields produce v0.2-compatible receipts. Systems that implement all fields produce v0.3-compatible receipts. v0.2 and v0.3 receipts are accepted by any XAP-compliant verifier.

[0.2.0] - In Progress

Added — v0.2 Gap Closure

  • AgentManifest — sixth primitive (primitive 0). Pre-negotiation trust credential with Ed25519 signature, Verity-backed capability attestations, and economic terms. The first cryptographic proof-of-performance in agent discovery.
  • RegistryQuery — complete query interface for agent discovery with composite scoring, cursor-based pagination, and AND-combined filters.
  • RegistryQuery response — ranked agent summaries with relevance scoring and pagination metadata.
  • Federation hints — also_registered_at and identity_portable_proof fields in AgentManifest seed v1.1 cross-registry discovery.
  • 14 new validation tests for AgentManifest (2 valid examples, 12 invalid edge cases).
  • Production and simple manifest examples.

Changed

  • Renamed protocol from ACP to XAP (eXchange Agent Protocol) to differentiate from Stripe/OpenAI Agentic Commerce Protocol
  • Renamed schema directory from /acp/schemas/ to /xap/schemas/
  • All monetary amounts now use integer minor units (no floating point)
  • Split shares now use basis points (integer, 1-10000)
  • Primitive count: 5 → 6 (AgentManifest added as primitive 0)

Added — v0.2 Hardening

  • Organizational identity hierarchy (org_id, team_id) in AgentIdentity
  • Chargeback policy field in SettlementIntent
  • Identity portability mechanism (export/import)
  • Verity outcome states: SUCCESS, FAIL, UNKNOWN, DISPUTED, REVERSED
  • CONTRIBUTING.md, SECURITY.md, CODE_OF_CONDUCT.md
  • Edge case registry with continuous learning system

Improved

  • Schema hardening across all six primitives
  • Field-by-field documentation for every schema
  • Error codes for every validation failure

[0.1.0] - 2026-02-25

Added

  • Initial draft of five XAP primitive schemas
    • AgentIdentity
    • NegotiationContract
    • SettlementIntent
    • ExecutionReceipt
    • VerityReceipt (partial)
  • README with protocol overview
  • MIT License