KQML as an Agent Communication Language

Reference: Tim Finin, Richard Fritzson, Don McKay, and Robin McEntire (1994). CIKM ’94 (Proceedings of the Third International Conference on Information and Knowledge Management). Source file: 191246.191322.pdf. URL

Summary

Foundational paper on the Knowledge Query and Manipulation Language (KQML), developed under the ARPA Knowledge Sharing Effort. KQML is both a message format and a message-handling protocol for run-time knowledge sharing among intelligent agents. It builds on speech-act theory: each message (a performative) carries an illocutionary force (ask, tell, subscribe, advertise, recommend, broker, recruit, etc.) atop a content language (often KIF) and an ontology reference.

The paper describes the three-layer structure (content / message / communication), facilitator agents that provide matchmaking, brokering and content-based routing, and implementations including routers, facilitators, and KRIL interface libraries. KQML became the reference point against which later ACLs (notably FIPA-ACL) were designed.

Key Ideas

• Performatives as speech-act-inspired message types
• Separation of content language, message layer, and transport
• Facilitators for advertise/subscribe, brokering, recruitment, routing
• Reserved performatives: ask-if/ask-all, tell, stream-all, subscribe, monitor, advertise, recruit
• KIF + ontologies as the assumed content layer

Connections

• KQML
• FIPA-ACL
• Agent Communication Languages
• Speech Act Theory
• Ontologies
• Multi-Agent Systems
• A Scalable Communication Protocol for Networks of LLMs
• KQML Overview
• KQML Language And Protocol
• KQML - A Language And Protocol For Knowledge And Information Exchange

Conceptual Contribution

• Claim: Interoperable knowledge sharing among heterogeneous intelligent agents requires a three-layer communication language (content / message / communication) whose message layer is built from speech-act-inspired performatives, and whose runtime infrastructure provides facilitator agents for matchmaking and brokering.
• Mechanism: Specify ~30 reserved performatives (ask-if, tell, subscribe, advertise, recruit, broker-one, …) that wrap a content expression (typically KIF) with an ontology reference and transport metadata; implement via routers, facilitators, and per-application KRIL interface libraries; demonstrate advertise/subscribe, content-based routing, and recruitment patterns.
• Concepts introduced/used: KQML, Performatives, Speech Act Theory, Facilitators, Facilitator Agents, Mentalistic Semantics, KIF, Ontologies, Agent Communication Languages, Conversation Policy, Interaction Protocols
• Stance: engineering / standard-proposal
• Relates to: Foundational reference against which FIPA-ACL, A Common Ontology Of ACLs, ACL Rethinking Principles, and Agent Communication Languages - Rethinking the Principles argue (over mentalistic vs commitment-based semantics). Performatives-as-protocol anticipates Agora’s Protocol Documents in A Scalable Communication Protocol for Networks of LLMs and the MCP/A2A/ANP layer of modern LLM agents (Model Context Protocol, Agent-to-Agent Protocol, Agent Network Protocol).

Tags

#kqml #acl #agent-communication #speech-acts #knowledge-sharing