Agent Client Protocol - v1.8.0
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    Type Alias CompactionUpdate

    A context compaction upsert. The first notification fixes the compaction's timeline position. Later updates with the same ID patch that entity in place. Agents MUST only send this update when the Client advertised [ClientSessionCapabilities::compaction].

    summary, error, and _meta have patch semantics: omission leaves the stored value unchanged, null clears it, and a concrete value replaces it. summary: [] also clears the summary.

    type CompactionUpdate = {
        compactionId: CompactionId;
        status: CompactionStatus;
        summary?: ContentBlock[] | null;
        error?: string | null;
        _meta?: { [key: string]: unknown } | null;
    }
    Index
    compactionId status summary? error? _meta?
    compactionId: CompactionId

    The Agent-owned ID of this compaction, unique within the session.

    status: CompactionStatus

    Current lifecycle status.

    summary?: ContentBlock[] | null

    Complete replacement user-displayable summary content for the compaction.

    error?: string | null

    Human-readable error details for the compaction.

    Optional_meta

    _meta?: { [key: string]: unknown } | null

    Extensible metadata patch for this compaction.

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