Glossary

Agent Discovery & Registries

• HCS-14 / HOL (Hashgraph Online / Hedera) – Hedera consensus-based universal agent ID standard using deterministic DIDs for protocol-agnostic agent identification.
• Contact: info@hashgraphonline.com

• ANP (Agent Network Protocol) (Agent Network Protocol Foundation) – Protocol for decentralized agent identity, protocol negotiation, and open agent marketplaces.
• GitHub: https://github.com/agent-network-protocol/spec

• HCS-10 (Hashgraph Online / Hedera) – Hedera-based agent messaging standard for real-time secure communication and registry-backed routing.
• Contact: info@hashgraphonline.com

• HCS-11 (Hashgraph Online / Hedera) – Hedera registry for agent profile metadata, public keys, and MCP server discovery.
• Contact: info@hashgraphonline.com

• NANDA (MIT Media Lab, collaborators) – Multi-layer decentralized agent registry with verifiable interaction logs and auditability for large-scale agent ecosystems.
• GitHub: https://github.com/projnanda/projnanda · Contact: nanda@media.mit.edu

• KYA (Know Your Agent) (Skyfire, Vouched, contributors) – Community-driven protocol for KYC-style verification, trust badges, and fraud prevention for AI agents.

• ANS (Agent Name Service) (Academic/IETF draft) – DNS-inspired agent naming and discovery system using PKI certificates and protocol adapters.

Identity/Access-Control & Digital Sovereignty

• ERC-8004 (Ethereum Foundation) – Ethereum on-chain agent identity and reputation registry based on ERC‑721 tokens.
• GitHub: https://github.com/ethereum/EIPs · Contact: Ethereum Magicians forum

• FPP (First Person Protocol) (Trust Over IP, Futurewei) – Trust Over IP protocol for first-person verifiable credentials and provenance for agents.
• Contact: contact@trustoverip.org

• Trust Over IP (ToIP) (LF Trust, DIF, Sovrin) – Linux Foundation framework for decentralized digital trust using DIDs, credentials, and layered governance.
• GitHub: https://github.com/trustoverip · Contact: contact@trustoverip.org

• UCAN (Fission / Brooklyn Zelenka) – Capability-based authorization tokens for delegated agent permissions and storage access.
• GitHub: https://github.com/ucan-wg · Contact: https://github.com/ucan-wg/spec/issues

• OpenID 4 VC (OpenID Foundation) – OpenID standard for issuing and presenting verifiable credentials with OAuth 2.0 flows.
• GitHub: https://github.com/Sphereon-Opensource/OID4VC · Contact: contact@openid.net

• W3C DIDs (W3C) – Web standard for decentralized identifiers used as portable, verifiable agent IDs.
• GitHub: https://github.com/w3c-ccg/did-spec · Contact: public-ccg@w3.org

• W3C Verifiable Credentials (W3C) – Data model for cryptographically verifiable claims about agents and entities.
• GitHub: https://github.com/w3c-ccg/vc-data-model · Contact: public-ccg@w3.org

• Affinidi (Affinidi) – DIDComm and W3C VC–based platform for passwordless login, credentials, and secure messaging between agents.
• GitHub: https://github.com/affinidi · Contact: via website

Agent-to-Tool/Service Communication

• MCP (Anthropic, OpenAI, Google) – Model Context Protocol enabling agents to call tools, access data, and share context.Quilt-Protocols-with-Glossary-Complete.csv
• GitHub: https://github.com/modelcontextprotocol · Contact: support@modelcontextprotocol.io

• OASF (Open Agentic Schema Framework) (AGNTCY / Cisco Outshift) – AGNTCY open framework for standardizing agent tool schemas, capabilities, and action specifications.
• GitHub: https://github.com/agntcy/oasf · Contact: hello@agntcy.org

• ACP (Agent Context Protocol) (Cisco / AGNTCY) – OpenAPI-based agent context sharing protocol for sharing state and context among agents.
• GitHub: https://github.com/agntcy/acp · Contact: hello@agntcy.org

Inter-Agent Communication & Orchestration

• A2A (Agent-to-Agent) (Google & partners) – Google-led protocol for direct agent-to-agent communication, messaging, and coordination with 50+ partners.
• GitHub: https://github.com/a2aproject/A2A · Contact: partners@a2aprotocol.ai

• AGNTCY (Cisco Outshift, Linux Foundation) – Cisco Outshift and Linux Foundation infrastructure protocol for agent orchestration and multi-agent coordination.
• GitHub: https://github.com/agntcy · Contact: hello@agntcy.org

• Open Agent Protocol (OAP) (LangChain/LangGraph Community) – LangChain/LangGraph community protocol for agent communication and coordination patterns.
• GitHub: https://github.com/openagents

• Swarm Protocol (Ethereum / Swarm Foundation) – Ethereum Swarm protocol adapted for multi-agent coordination and decentralized agent discovery
• GitHub: https://github.com/ethersphere · Contact: info@ethswarm.org

• ActivityPub (W3C) – W3C federated social protocol repurposed for decentralized agent-to-agent messaging and federation.
• GitHub: https://www.w3.org/wiki/Socialwg

• Agora Protocol (Oxford University AI Institute) – Oxford University AI Institute protocol for agent communication and decentralized agent marketplaces.
• GitHub: https://github.com/oxford-ai/agora-protocol

• HumanAIX (HumanAIX Foundation) – Multimodal human-in-the-loop interaction and workflow protocol for AI agents.
• GitHub: https://github.com/humanaix · Contact: team@humanaix.org

• Super Protocol (Super Protocol Labs / Filecoin / Ethereum) – Confidential computing and decentralized AI cloud for running privacy-preserving agent workloads.
• GitHub: https://github.com/superprotocol · Contact: partners@superprotocol.com

• IEEE 2874–2025 (Spatial Web Protocol) (IEEE SA, Verses) – IEEE standard for spatial, semantic identity and context sharing across Web3, IoT, and XR systems.
• Contact: contact@ieee.org

Financial Services & Payments

• x402 (Coinbase, Web3 Ecosystem) – HTTP 402 payment protocol enabling stablecoin micropayments for agent services using 402 status codes.
• GitHub: https://github.com/coinbase/x402 · Contact: dev@x402.org

• AP2 (Agent Payments Protocol) (Google, PayPal, Mastercard) – Google, PayPal, Mastercard protocol for agent-to-agent and agent-to-human payment settlement.
• GitHub: https://github.com/google-agentic-commerce/AP2 · Contact: dev@ap2-protocol.org

• ACP (Agentic Commerce Protocol) (Stripe, OpenAI) – Stripe and OpenAI protocol enabling agents to execute commerce transactions and payment flows.
• GitHub: https://github.com/stripe/acp · Contact: acp@stripe.com

• ACP on Virtuals (Base / Coinbase / Ethereum) – Escrow and state-channel payments for agent jobs running on the Virtuals protocol.

Agent Trust & Reputation Systems

• Trusted Agent Protocol (Cloudflare, Visa, Mastercard, Amex) – Cloudflare, Visa, Mastercard protocol for agent trust verification and behavioral validation.Quilt-Protocols-with-Glossary-Complete.csv
• GitHub: https://github.com/visa/trusted-agent-protocol

• NEAR AITP (AI Trusted Protocol) (NEAR Foundation / AITP Alliance) – Smart-contract framework for verifiable agent execution and cross-chain trust on NEAR and EVM.
• GitHub: https://github.com/near/aitp · Contact: aitp-info@near.org

Cross-Cutting Standards & Frameworks

• IETF AI Agent Protocols Framework (IETF) – Meta-framework from IETF working group providing foundations for standardizing AI agent protocols.
• GitHub: https://github.com/ietf-wg-ai-agent-protocols/drafts · Contact: ietf@ietf.org

• IEEE P3394 (AI Agent Interoperability) (IEEE Standards Association) – IEEE standard for agent-to-agent and agent-to-system interoperability frameworks.
• Contact: contact@ieee.org

• IEEE SA IC25-003 (Multi-Agent Evaluation) (IEEE Standards Association Industry Connections) – Framework for evaluating multi-agent systems reasoning about novel, complex problems.