Function collectReadToolFilePaths

src/services/compact/compact.ts:1610–1655

* Scan messages for Read tool_use blocks and collect their file_path inputs * (normalized via expandPath). Used to dedup post-compact file restoration * against what's already visible in the preserved tail. * * Skips Reads whose tool_result is a dedup stub — the stub points at an * earlier full

(messages: Message[])

 * createPostCompactFileAttachments to re-inject the real content.
 */
function collectReadToolFilePaths(messages: Message[]): Set<string> {
  const stubIds = new Set<string>()
  for (const message of messages) {
    if (message.type !== 'user' || !Array.isArray(message.message.content)) {
      continue
    }
    for (const block of message.message.content) {
      if (
        block.type === 'tool_result' &&
        typeof block.content === 'string' &&
        block.content.startsWith(FILE_UNCHANGED_STUB)
      ) {
        stubIds.add(block.tool_use_id)
      }
    }
  }

  const paths = new Set<string>()
  for (const message of messages) {
    if (
      message.type !== 'assistant' ||
      !Array.isArray(message.message.content)
    ) {
      continue
    }
    for (const block of message.message.content) {
      if (
        block.type !== 'tool_use' ||
        block.name !== FILE_READ_TOOL_NAME ||
        stubIds.has(block.id)
      ) {
        continue
      }
      const input = block.input
      if (
        input &&
        typeof input === 'object' &&
        'file_path' in input &&
        typeof input.file_path === 'string'
      ) {
        paths.add(expandPath(input.file_path))
      }
    }
  }
  return paths
}

const SKILL_TRUNCATION_MARKER =
  '\n\n[... skill content truncated for compaction; use Read on the skill path if you need the full text]'