What you can use in app YAML

This page is the inventory for app authors. Everything below is something you declare or call from app.yaml (and optional bundle files). Copy examples from the tutorials and paste them into your own app.

Modules you can enable

Declare them under tools.modules:

Module	Tools (actions)	Typical use
bash	run	Shell commands
browser	open, act, read	Browser automation
database	connect, query, disconnect	SQL / data stores
filesystem	read, write, edit, multi_edit, glob, grep, delete	Files in the workdir
http	request, download, upload	HTTP calls
lsp	diagnostics, notify_change, reload_app	Language-server feedback
mcp	Virtual tools from MCP servers	External tool servers
connector	Dynamic (connected connectors)	Digitorn connectors
preview	inspect, snapshot	Live preview pane
previewshot	screenshot	Preview screenshots
rag	Search / ingest family (see rag)	Knowledge bases
scheduler	schedule	Timed wake-ups
web	search, fetch	Web search and fetch

Also available without a full module page in every tutorial:

Id	Role in YAML
memory	Goals, remember, tasks
context_builder	Meta-tools (discovery, parallel, background)
agent_spawn	Multi-agent agent tool
channels	Background I/O adapters (webhook, cron, …)

Built-in meta tools

When discovery / context injection is on, agents can use tools such as:

search_tools, get_tool, execute_tool, run_parallel, background_run (including watch loops), and when enabled ask_user, call_app, use_skill, memory helpers, agent.

Details: Built-in tools, Primitives.

Channels you can declare

Under tools.modules.channels.config.providers, adapters such as webhook, cron, rss, telegram, discord, whatsapp, and connector are the supported shapes. See Channels.

Next steps

• Start writing: Getting started
• Full grammar: Language
• Per-module pages: Module reference