Query Engine & Main Loop

// biome-ignore-all assist/source/organizeImports: ANT-ONLY import markers must not be reordered

import type {

  ToolResultBlockParam,

  ToolUseBlock,

} from '@anthropic-ai/sdk/resources/index.mjs'

import type { CanUseToolFn } from './hooks/useCanUseTool.js'

import { FallbackTriggeredError } from './services/api/withRetry.js'

import {

  calculateTokenWarningState,

  isAutoCompactEnabled,

  type AutoCompactTrackingState,

} from './services/compact/autoCompact.js'

import { buildPostCompactMessages } from './services/compact/compact.js'

/* eslint-disable @typescript-eslint/no-require-imports */

const reactiveCompact = feature('REACTIVE_COMPACT')

  ? (require('./services/compact/reactiveCompact.js') as typeof import('./services/compact/reactiveCompact.js'))

  : null

const contextCollapse = feature('CONTEXT_COLLAPSE')

  ? (require('./services/contextCollapse/index.js') as typeof import('./services/contextCollapse/index.js'))

  : null

/* eslint-enable @typescript-eslint/no-require-imports */

import {

  logEvent,

  type AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,

} from 'src/services/analytics/index.js'

import { ImageSizeError } from './utils/imageValidation.js'

import { ImageResizeError } from './utils/imageResizer.js'

import { findToolByName, type ToolUseContext } from './Tool.js'

import { asSystemPrompt, type SystemPrompt } from './utils/systemPromptType.js'

import type {

  AssistantMessage,

  AttachmentMessage,

  Message,

  RequestStartEvent,

  StreamEvent,

  ToolUseSummaryMessage,

  UserMessage,

  TombstoneMessage,

} from './types/message.js'

import { logError } from './utils/log.js'

import {

  PROMPT_TOO_LONG_ERROR_MESSAGE,

  isPromptTooLongMessage,

} from './services/api/errors.js'

import { logAntError, logForDebugging } from './utils/debug.js'

import {

  createUserMessage,

  createUserInterruptionMessage,

  normalizeMessagesForAPI,

  createSystemMessage,

  createAssistantAPIErrorMessage,

  getMessagesAfterCompactBoundary,

  createToolUseSummaryMessage,

  createMicrocompactBoundaryMessage,

  stripSignatureBlocks,

} from './utils/messages.js'

import { generateToolUseSummary } from './services/toolUseSummary/toolUseSummaryGenerator.js'

import { prependUserContext, appendSystemContext } from './utils/api.js'

import {

  createAttachmentMessage,