Context items

A context_item is one unit of usable context. It can be text, structured data, a resource link, an artifact part, a tool result ref, a browser observation, a summary, or opaque referenced content.

Required fields

Field	Purpose
item_id	Stable item id.
context_kind	Semantic kind of the item.
content_mode	Inline, ref, summary, embedded resource, resource link, artifact ref, tool result ref, or opaque.
visibility	Targets allowed to see the item.

Recommended fields

Add title, mime_type, language, source_refs, token_estimate, byte_size, freshness, trust_level, priority, sensitivity, redaction_state, and metadata.

Fixed rule

An item is context, not authority by itself. Authority comes from its source refs, provenance, freshness, and policy/evidence links.