Function normalizeToolInputForAPI

src/utils/api.ts:685–718

(
  tool: T,
  input: z.infer<T['inputSchema']>,
)

// Strips fields that were added by normalizeToolInput before sending to API
// (e.g., plan field from ExitPlanModeV2 which has an empty input schema)
export function normalizeToolInputForAPI<T extends Tool>(
  tool: T,
  input: z.infer<T['inputSchema']>,
): z.infer<T['inputSchema']> {
  switch (tool.name) {
    case EXIT_PLAN_MODE_V2_TOOL_NAME: {
      // Strip injected fields before sending to API (schema expects empty object)
      if (
        input &&
        typeof input === 'object' &&
        ('plan' in input || 'planFilePath' in input)
      ) {
        const { plan, planFilePath, ...rest } = input as Record<string, unknown>
        return rest as z.infer<T['inputSchema']>
      }
      return input
    }
    case FileEditTool.name: {
      // Strip synthetic old_string/new_string/replace_all from OLD sessions
      // that were resumed from transcripts written before PR #20357, where
      // normalizeToolInput used to synthesize these. Needed so old --resume'd
      // transcripts don't send whole-file copies to the API. New sessions
      // don't need this (synthesis moved to emission time).
      if (input && typeof input === 'object' && 'edits' in input) {
        const { old_string, new_string, replace_all, ...rest } =
          input as Record<string, unknown>
        return rest as z.infer<T['inputSchema']>
      }
      return input
    }
    default:
      return input
  }
}