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Agent Architecture
The Loop You Are Writing For
Models and Thinking Level
The Context Window Is a Budget
Sessions and Where They Live
Skills
Skills That Carry Files
Events and the Extension Lifecycle
Changing What Pi Knows
Extension State and Persistence
Slash Commands and Custom UI
MCP Servers
Compaction
Branching and Forking
Steering, Queuing, and Changing Direction
Message Types
The Session File Format
Context Admission Is Application Policy
Failures, Retries, and Recovery
The Interface Is Not the Agent
Model Access Without the Coding Agent
The Agent Core on Its Own
A Stochastic Step Is a Typed Function
Seams, Hooks, and Irreversible Decisions
Composing Agent Operations
Testing Stochastic Software
Authority, Isolation, and What Makes an Agent Worth Building