Inform the user

Keep the user informed of what the agent is doing.

REQUIRED: message (one-line text)

When to notify

Every step that produces effects. Editing code, running builds, checking output, fixing errors — always notify. Pure reads (find, read, ls, grep) are passive lookups and do not warrant notification.

Before every mutating tool call (edit, bash with side effects, write)
After every tool call that changes state or produces output worth surfacing
On errors and unexpected output
On completion

Message format

message: One-line text describing the action. Max 70 chars.
Never include IDs, codes, hashes, filenames, or specific references — keep it high-level.