deepseek-ai/deepseek-harness · error · Error

Invalid `insert_line` parameter: ${insertLine}. It should be

Error message

Invalid `insert_line` parameter: ${insertLine}. It should be within the range of lines of the file: [0, ${lines.length}]

What it means

Error "Invalid `insert_line` parameter: ${insertLine}. It should be within the range of lines of the file: [0, ${lines.length}]" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/fs/tool-str-replace-editor/src/index.ts:345

  policy: MutationPolicy,
  path: string,
  insertLine: number | undefined,
  newStr: string | undefined,
  exec: ToolRunContext,
): Promise<string> {
  if (insertLine === undefined) throw new Error('Parameter `insert_line` is required for command: insert')
  const value = requiredForCommand(newStr, 'new_str', 'insert')
  const sandboxPolicy = policy.resolve(exec)
  const target = await resolveTarget(ctx, path, exec.signal)
  const intent = await ctx.waterfall('fs/edit-intent', target, exec, () => undefined)
  const info = await statExisting(ctx, target, 'insert', exec)
  if (info.type !== 'file') {
    throw new FsError(`cannot insert into "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
  }
  const before = await ctx.fs.readText(target, exec.signal)
  const lines = before.split('\n')
  if (!Number.isInteger(insertLine) || insertLine < 0 || insertLine > lines.length) {
    throw new Error(
      `Invalid \`insert_line\` parameter: ${insertLine}. It should be within the range of lines of the file: [0, ${lines.length}]`,
    )
  }
  const after = [
    ...lines.slice(0, insertLine),
    ...value.split('\n'),
    ...lines.slice(insertLine),
  ].join('\n')
  const expected: FsWriteIntent = intent === undefined
    ? { kind: 'replaceIfVersion', version: info.version }
    : { kind: 'replaceIfVersion', version: intent.version }
  let outcome
  try {
    outcome = await ctx.fs.writeText(target, after, expected, exec.signal, sandboxPolicy)
  } catch (error: unknown) {
    throw policy.mapError(error, sandboxPolicy)
  }
  ctx.emit('fs/observed', target, { kind: 'present', version: outcome.version }, exec)

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/fs/tool-str-replace-editor/src/index.ts:345 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/358a38aac4b4d993. Report an issue: GitHub.