Function setupSessionMemoryFile

src/services/SessionMemory/sessionMemory.ts:183–233

(
  toolUseContext: ToolUseContext,
)

}

async function setupSessionMemoryFile(
  toolUseContext: ToolUseContext,
): Promise<{ memoryPath: string; currentMemory: string }> {
  const fs = getFsImplementation()

  // Set up directory and file
  const sessionMemoryDir = getSessionMemoryDir()
  await fs.mkdir(sessionMemoryDir, { mode: 0o700 })

  const memoryPath = getSessionMemoryPath()

  // Create the memory file if it doesn't exist (wx = O_CREAT|O_EXCL)
  try {
    await writeFile(memoryPath, '', {
      encoding: 'utf-8',
      mode: 0o600,
      flag: 'wx',
    })
    // Only load template if file was just created
    const template = await loadSessionMemoryTemplate()
    await writeFile(memoryPath, template, {
      encoding: 'utf-8',
      mode: 0o600,
    })
  } catch (e: unknown) {
    const code = getErrnoCode(e)
    if (code !== 'EEXIST') {
      throw e
    }
  }

  // Drop any cached entry so FileReadTool's dedup doesn't return a
  // file_unchanged stub — we need the actual content. The Read repopulates it.
  toolUseContext.readFileState.delete(memoryPath)
  const result = await FileReadTool.call(
    { file_path: memoryPath },
    toolUseContext,
  )
  let currentMemory = ''

  const output = result.data as FileReadToolOutput
  if (output.type === 'text') {
    currentMemory = output.file.content
  }

  logEvent('tengu_session_memory_file_read', {
    content_length: currentMemory.length,
  })

  return { memoryPath, currentMemory }
}

/**
 * Initialize session memory config from remote config (lazy initialization).