v1.0.6-preview.1

Feature: experimental context attribution APIs

Two new experimental methods on session.metadata provide per-source token attribution for the session's context window. (#1886)

getContextAttribution() returns a flat list of attribution entries — skills, subagents, MCP servers, tools, plugins — each with a token count and hierarchical nesting via parentId. getContextHeaviestMessages() returns the largest individual messages currently in context, most-expensive first.

const attr = await session.metadata.getContextAttribution();
// attr.contextAttribution.entries → [{ kind: 'skill', id: 'skill:tmux', tokens: 1234, ... }, ...]
const heavy = await session.metadata.getContextHeaviestMessages({ limit: 10 });

var attr = await session.Metadata.GetContextAttributionAsync();
var heavy = await session.Metadata.GetContextHeaviestMessagesAsync(limit: 10);

Other changes

• feature: SlashCommandInput now supports an optional choices field, allowing slash commands to declare selectable literal options with human-facing descriptions (#1886)
• feature: ExternalToolTextResultForLlm now supports toolReferences for returning deferred tool names to the model from a tool-search override (#1886)

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