Reference

Look up exact commands, settings, types, and tool contracts here. For a walkthrough, start with Guides or Build with Atomic.

Everyday contracts

CLI reference — every command, flag, argument, and environment variable.
Settings — every settings field, with defaults and constraints.
Environment variables — Atomic/Pi aliases, provider credentials, and bash session metadata.
Keybindings — default shortcuts and custom keybinding actions.
Built-in tools, including hashline editing.
MCP Servers for server configuration, tool discovery, and authentication.

Provider reference — stop reasons and credential resolution order.
Model configuration reference — provider and model fields, overrides, variants, and API compatibility.
Compaction reference — parameters, persistence, hooks, formats, settings, and historical formats.
Extension API reference — ExtensionContext, ExtensionCommandContext, and ExtensionAPI methods.
Extension events — every event and its payload.
SDK API reference — options, loaders, return values, run modes, and exports.
RPC protocol — commands, events, types, and errors.
TUI API reference — component, focusable, input, and rendering contracts.
Session format — the JSONL session file format, entry types, and SessionManager API.
Theme reference — theme file format, color tokens, and color values.
Skill reference — SKILL.md frontmatter and validation.
Subagent reference — fallback models and reasoning levels.
Intercom reference — the intercom tool contract and settings.
Package reference — filtering, scope, and deduplication.
Provider API reference — provider config and model definition contracts.
Workflow API reference — workflow, stage, and context contracts.