Periodic Table of Agentic Elements — 22 confirmed elements · 2 predicted gaps · 3 boson-class protocols Hover any element for full description, dependency layer, and group classification.
Infrastructure
State
Retention
Cognition
Action
Pattern
Exchange (boson)
Predicted gap
Infra
State
Retention
Cognition
Action
Pattern
Exchange
P1Infrastructure
01CeCode Execution Env.
02FsFile System Env.
03DbStructured Data Store
04ExExternal System Interface
P2Context
05EsExecution State
06WsWorkflow State
07CpCheckpoint State
P3Short-Horizon Retention
08SsSession Memory
09WmWorking Memory
P4Semantic Processing
10LmLarge Language Model
11EcEncoder / Embedding
P5Long-Horizon Retention & Action
12SmSemantic Memory
15RtRead Tool
13PmProcedural Memory
16WtWrite Tool
14EmEpisodic Memory
17LtLogic Tool
18CtCommunication Tool
P6Reasoning Patterns
19IsInformation Skill
20TsTransformation Skill
21GsGeneration Skill
22DsDecision Skill
???sInteraction Skill
Exchange group — boson class · topology-agnostic protocol surfaces · exist in the exchange, not inside any component
McStrong agentic
Tool Invocation Protocol
Contract-declared discovery and invocation. Agent → tool boundary. Carries data and execution. Current instantiation: MCP.
A2Weak agentic
Governed Delegation Protocol
Intent and authority-carrying delegation. Agent → agent boundary. Carries task, intent, authority. Current instantiation: A2A.
A3Human closure
Human Interface Protocol
Closes the intent chain at the human boundary. The only boson that delivers legible output to the human. Current instantiation: A2UI.
Layer 0 — sub-atomic substrate (beneath the table; not ASM elements)