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Molecules

Concept-level compositions (B3) — the named agentic vocabulary built from primitives.

AgentLoop — think → act → observe (the centerpiece)

step 2
Agentthink
tools
answer

LLMCall

You
Claudeopus-4.8
Response

ToolCall

Claude
read_file

PromptStack

systemYou are a helpful assistant.
userExplain agent loops.
assistantThink, act, observe — repeat.
Claudeopus-4.8

ToolRegistry

Agent
tools available
read_file
run_bash
github

Guardrail — pass / block

You
input
Claude
output
Response
You
input
Claude
output
blocked

MCPConnector

Agentclient
MCPserver
github

MemoryStore

Agent
memory

Router

Router
billing
tech
sales

Skill

Agent
pdf
skill
read · fill · merge PDFs

ContextWindow

context window3,200 / 8,000 tok