Ontologies transcend their traditional role as static schema documentation and emerge as dynamic, executable metadata that actively controls and defines the capabilities of AI agents
Ontologies transcend their traditional role as static schema documentation and emerge as dynamic, executable metadata that actively controls and defines the capabilities of AI agents. š³
They're storing the instructions agents use to operate on that data.
Traditional software architectures separate code from data, with logic hardcoded in application layers while data resides in storage layers.
The ontology-based approach fundamentally challenges this separation by storing behavioral rules and tool definitions as graph data that agents actively query during execution.
Ontologies in these systems operate as runtime-queryable metadata rather than compile-time specifications
This is meta-programming at the database level, and the technical implications are profound:
Traditional approach: Your agent has hardcoded tools. Each tool is a Python function that knows exactly what query to run, which entity types to expect, and how to navigate relationships.
Ontology-as-meta-tool approach: Your agent has THREE generic tools that query the ontology at runtime to figure out how to operate.
Here's the technical breakdown:
Tool 1 does semantic search and returns mixed entity types (could be Artist nodes, Subject nodes, whatever matches the vector similarity).
Tool 2 queries the ontology: "For this entity type, what property serves as the unique identifier?" The ontology responds because properties are marked with "inverseFunctional" annotations. Now the agent knows how to retrieve specific instances.
Tool 3 queries the ontology again: "Which relationships from this entity type are marked as contextualizing?" The ontology returns relationship types. The agent then constructs a dynamic Cypher query using those relationship types as parameters.
The breakthrough: The same three tools work for ANY domain. Swap the art gallery ontology for a medical ontology, and the agent adapts instantly because it's reading navigation rules from the graph, not from code.
This is self-referential architecture. The system queries its own structure to determine its own behavior. The ontology becomes executable metadata - not documentation about the system, but instructions that drive the system.
The technical pattern:
Store tool definitions as (:Tool) nodes with Cypher implementations as properties
Mark relationships with custom annotations (contextualizing: true/false)
Mark properties with OWL annotations (inverseFunctional for identifiers)
Agent queries these annotations at runtime to construct dynamic queries
Result: You move from procedural logic (IF entity_type == "Artist" THEN...) to declarative logic (query the ontology to learn the rules).
The system can now analyze its own schema, identify missing capabilities, and propose new tool definitions.
It's not just configurable - it's introspective.
What technical patterns have you found for making agent capabilities declarative rather than hardcoded? | 37 comments on LinkedIn
Ontologies transcend their traditional role as static schema documentation and emerge as dynamic, executable metadata that actively controls and defines the capabilities of AI agents