@anthropic-ai/sdk/lib/sessions/accumulate.mjs

The official TypeScript library for the Anthropic API

import { AnthropicError } from "../../core/error.mjs";
export function accumulateManagedAgentsEvent(accumulated, event) {
    switch (event.type) {
        case 'event_start': {
            if (event.event.type === 'agent.message') {
                return { id: event.event.id, type: 'agent.message', content: [], processed_at: '' };
            }
            return accumulated;
        }
        case 'agent.message': {
            return { ...event, content: event.content.map((block) => ({ ...block })) };
        }
        case 'event_delta': {
            if (accumulated === undefined) {
                throw new AnthropicError(`event_delta for ${event.event_id} received before its event_start`);
            }
            const idx = event.delta.index ?? 0;
            const fragment = event.delta.content;
            // Indices arrive in order — the first delta at a new index opens the slot.
            // A gap means deltas arrived out of order or were mis-routed.
            if (idx > accumulated.content.length) {
                throw new AnthropicError(`event_delta index ${idx} is beyond the end of content (length ${accumulated.content.length})`);
            }
            const existing = accumulated.content[idx];
            if (existing === undefined) {
                // New index: pass the fragment through as a fresh block.
                return { ...accumulated, content: [...accumulated.content, { ...fragment }] };
            }
            let updated = existing;
            switch (fragment.type) {
                case 'text':
                    if (existing.type === 'text') {
                        updated = { ...existing, text: existing.text + fragment.text };
                    }
                    break;
                default:
                    checkNever(fragment.type);
            }
            const content = accumulated.content.slice();
            content[idx] = updated;
            return { ...accumulated, content };
        }
        case 'user.message':
        case 'user.interrupt':
        case 'user.tool_confirmation':
        case 'user.tool_result':
        case 'user.custom_tool_result':
        case 'user.define_outcome':
        case 'agent.thinking':
        case 'agent.tool_use':
        case 'agent.tool_result':
        case 'agent.custom_tool_use':
        case 'agent.mcp_tool_use':
        case 'agent.mcp_tool_result':
        case 'agent.thread_message_received':
        case 'agent.thread_message_sent':
        case 'agent.thread_context_compacted':
        case 'session.error':
        case 'session.updated':
        case 'session.deleted':
        case 'session.status_running':
        case 'session.status_idle':
        case 'session.status_rescheduled':
        case 'session.status_terminated':
        case 'session.thread_created':
        case 'session.thread_status_running':
        case 'session.thread_status_idle':
        case 'session.thread_status_rescheduled':
        case 'session.thread_status_terminated':
        case 'span.model_request_start':
        case 'span.model_request_end':
        case 'span.outcome_evaluation_start':
        case 'span.outcome_evaluation_ongoing':
        case 'span.outcome_evaluation_end':
        case 'system.message':
            return accumulated;
        default:
            checkNever(event);
            return accumulated;
    }
}
// Compile-time exhaustiveness guard.
function checkNever(_x) { }
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